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Journal of Drainage and Irrigation Machinery Engin
 
2011 Vol.29 Issue.4
Published 2011-07-30
article
Article
277 Iteration method of direct inverse problem of mixed- flow pump impeller design
Bing Hao,Cao Shuliang,Tan Lei
The meridional flow field inside a mixed-flow pump was obtained by employing iterative calculation to settle the continuity and motion equations of fluid,based on the flow theory of two families of relative stream surfaces.Thus,the direct problem calculation was achieved.The inverse problem of mixed-flow pump was solved by firstly employing point-by-point integration method to draw the blade shape,secondly thickening the blade on the meridional surface and finally smoothing the leading edge of the blade by conformal mapping.On the base of this,the iterative design method of direct and inverse problems of the mixed-flow pump impeller was developed by combining the direct problem with the inverse problem.In this design method,the direct problem calculation offered the flow field information to the inverse problem design and the inverse problem design provided the impeller model to the direct problem calculation.The impeller was not finally determined until the direct and inverse problems converged.The results showed that the impeller,obtained by iterative design method of direct and inverse problems,has more uniform load distribution and higher hydraulic efficiency.This iterative design method can effectively cover the shortage of the traditional method,which is that the meridional flow calculation can only satisfy the continuity equation of fluid when designing the blade.In addition,this method can also consider the effect of blade shape on the meridional flow calculation.Therefore,the finally determined blade shape,obtained in the condition of satisfying both the continuity and motion equations of fluid,can not only enhance the accuracy of design calculation,but also provide a platform for further research of optimization design of the mixed-flow pump impeller.
2011 Vol. 29 (4): 277-281 [Abstract] ( 2705 ) [HTML 1KB] [ PDF 592KB] ( 2351 )
282 Flow analysis based on wavelet packet decomposition for centrifugal pumps at shut- off condition
Yuan Shouqi,Huang Ping,Luo Yin,Liang Yun,Fu Yanxia
In order to research the effect of pressure fluctuation caused by complicated flow inside centrifugal pumps at shut-off condition,based on the virtual technology and LabView,the pressure signal of centrifugal pumps was decomposed and the wavelet packet analysis was applied to extract the feature spectrum and establish different frequency bands.The experiment was carried out to test the analysis results.The analysis results show that the pressure pulsation at shut-off condition is irregular and non-cyclical,and low-frequency pulsation plays an important role.With the flow decreases,the amplitude of the shaft frequency first increases and then decreases.Backflow appears when centrifugal pumps operate at low flow rate to shut-off condiftions and the wavelet packet reconstruction coefficient changes,and it could be concluded that backflow exert significant influence at low frequency.The amplitude and strength at shut-off condition with enhancement on shaft frequency.The inlet backflow of centrifugal pumps at shut-off condition is braided backflow.The validating test results show that different frequency corresponding to different unsteady flow can be identified based on wavelet packet,which will improve the diagnosis of the inner flow of centrifugal pumps at shut-off condition.
2011 Vol. 29 (4): 282-286 [Abstract] ( 2469 ) [HTML 1KB] [ PDF 562KB] ( 1713 )
287 Effect of vane profile on hydraulic energy recovery turbines performance
Yang Junhu,Wang Xiaohui
Taking 3 hydraulic energy recovery turbines as objects,three types of vane profiles of turbine runners with different blade inlet angles and wrap angles were designed while other hydraulic geome-trical parameters and rotational speed fixed.Numerical simulations were carried out for turbines by computational fluid dynamics software Fluent.The simulation results show that the vortex in turbine runner vane profile 1 is weak,the relative velocity and pressure distribution of turbine runner vane profile 1 are more accordant than that of turbine runner vane profile 2 and 3,and turbine runner vane profile 3 is the worst at the best efficiency point.Its best efficiency of turbine runner vane profile 1 is 1% and 2% better than that of turbine runner vane profile 2 and 3 approximately.The head and efficiency relationship of these three turbine runners are H2>H3>H1,η1>η2>η3 at smaller flow rate,while H2>H1>H3,η3>η2>η1 at larger flow rate.The results also show that there is a combination of the optimal blade inlet angle and wrap angle while other hydraulic geometrical parameters fixed.There exists relative eddy at turbine runner inlet near the pressure surface.The head of turbine runner vane profile 3 is low under the same flow rate.Larger the blade wrap angle is,lower the turbines efficiency is at larger flow rate.
2011 Vol. 29 (4): 287-291 [Abstract] ( 2074 ) [HTML 1KB] [ PDF 668KB] ( 1971 )
292 Numerical simulation for piezoelectric valve- less micro- mixer
He Xiuhua,Deng Xulian,Bi Yushi,Wang Jian,Zhuo Hongcai
A piezoelectric valve-less micro-mixer was designed.Structure and working principle of the micro-mixer were illustrated and analyzed.Transient dynamic analysis was done on the round composite piezoelectric vibrator using ANSYS software.Displacement changing laws of the points on the center plane of the vibrator with radius and driving voltage under condition of the piezoelectric vibrator driven by sinusoidal alternating voltage were studied.It is found that displacements of the points behave sinusoidal changing laws.Amplitudes of the points decrease with radius but increase with driving voltage.Motion displacement equation of the piezoelectric vibrator was fitted according to displacement of each point on piezoelectric vibrator.A UDF program was edited and complied according to the motion displacement equation,and then the program was transferred to the Fluent software used as the moving boundary of the piezoelectric vibrator.Dynamic numerical simulation was carried out on the piezoelectric valve-less micro-mixer,as well as the flowrate of the micro-mixer and mixing conditions in the micro-mixer at different time were obtained.The results show that the piezoelectric valve-less micro-mixer designed is not only able to pump fluids but also to get fluids mixed well in a short time.
2011 Vol. 29 (4): 292-296 [Abstract] ( 2033 ) [HTML 1KB] [ PDF 532KB] ( 1889 )
297 Mechanism of silt abrasion enhanced by cavitation in silt laden water flow
Zhang Tao,Chen Cichang,Lü Dongli,Li Dan
On the basis of experimental study of cavitation erosion,silt abrasion and their synergetic erosion on hydrofoil,the mechanism of silt abrasion enhanced by cavitation in hydraulic machinery was analyzed combined with the testing and processing of cavitation structure in silt laden water flow.The erosion patterns were obtained by the contrastive analysis of microscopic appearance in different positions of the hydrofoil surface on three testing conditions and the flow factors which cause different erosion patterns were determined.The characteristics and law of behaviors of cavitation structure on hydrofoil were obtained by analysis and processing of cavitation structure images.The different mechanisms of silt abrasion enhanced by cavitation at the two stages of development of cavitation cavity and collapse of cavitation cloud are put forward by the analysis of erosion patterns and cavitation behaviors on hydrofoil.During the cavitation development stage,the silt particles are accelerated by cavitation cavity.During the cavitation cloud collapse stage,the silt particles are accelerated heavily by pressure wave or micro-jet.The synergetic erosion ability is strengthened by the actions on particles during the two stages.The viewpoints were verified by the experimental results of erosion depth of silt abrasion and their synergetic erosion on hydrofoil
2011 Vol. 29 (4): 297-302 [Abstract] ( 2913 ) [HTML 1KB] [ PDF 554KB] ( 2264 )
303 Numerical simulation of unsteady flow in high- speed partial emission pump
Chai Liping,Pan Binghui,Shi Haixia,Jiang Wei,Cao Minhong
In order to research the mechanism of pressure fluctuation that were caused by the impeller-volute interaction of a high-speed partial emission pump,a numerical simulation of unsteady flow was carried out by applying the sliding mesh technique in computational fluid dynamics software Fluent on the whole pump under three working points of 0.5Q0,1.0Q0 and 1.5Q0,respectively.The static pressure distribution of volute was recorded at three different times and flow rates,and the time and frequency domain of pressure fluctuation of 9 monitoring points in the inner wall of volute were analyzed by fast Fourier transform for velocity and pressure.The simulation results show that static pressure has not much change over time at the same flow rate.At the same time,the static pressure increases with flow rate.The pressure fluctuation has a cyclic variation,and the amplitude value decreases with increasing of the flow rate.The amplitude value of monitoring point 4 is biggest at the small flow rate condition,but the amplitude value of monitoring point 5 is biggest at the design and large flow rate conditions.The frequency amplitude value increases with increasing of the flow rate.It illustrates that the flow rate has a great impact on vibration of high-speed partial emission pump,and this phenomenon is particularly serious in the nozzle region.
2011 Vol. 29 (4): 303-306 [Abstract] ( 2165 ) [HTML 1KB] [ PDF 633KB] ( 2027 )
307 Unsteady flow and interaction control of counter- rotating double- rotor turbine
Yang Lijing,An Yuan,Wang Youqing,Han Fengqin,Kubota Takashi
 In order to drastically increase the power performance and the operating stability of hydraulic machinery,a new bulb turbine with counter-rotating double-rotor was developed.An adjustable-blade system was applied to both rotors of the turbine.Based on the new concept of fair-blade loading,a logical balance of supply and demand for Euler energies between the two rotors was sought.The blade profiles from hub to tip were designed to keep the equilibrium of Euler energy strictly.By the numerical unsteady flow analysis,the degree of Euler energy balance and the control of their interaction were investigated.The research results show that when the front and rear rotors have the same discharge and head,and is under the same size as that of a single rotor turbine,the sum of output powers from the front and rear rotors was doubled.By analyzing the flow interaction between two rotors and between the outlet of rear rotor and inlet of diffuser,the following conclusions are obtained: the output power is doubled without changing the unit size.The Euler energy interaction between the counter-rotating double-rotor is controlled to be small.The amplitude of hydraulic fluctuations is only about 2% of respective head without pressure surge under the on-cam operation.The rotating torques of the two rotors are compensated with good stability.
2011 Vol. 29 (4): 307-311 [Abstract] ( 2033 ) [HTML 1KB] [ PDF 553KB] ( 1435 )
312 Orthogonal test and optimization design of submersible pump guide vanes
Zhou Ling,Shi Weidong,Lu Weigang,Xu Rongjun,Wang Chuan
 In order to improve the performance of submersible pumps,with a channel-type guide vane as research object,an L9(34) orthogonal experiment was performed with four factors and three values including blade wrap angle of guide vane,blade inlet angle,and the wrap angle of transition,etc.9 channel-type guide vanes were designed.The blade profile of guide vane was designed to be vary angle logarithmic spiral,9 guide vanes were coupled with the same impeller.The whole flow field of two-stage submersible pump at the operating point for design was simulated by Fluent using the standard k-ε turbulence model,SIMPLEC algorithm,second-order upwind scheme to solve and analyze the indepen-dent of the number of the grid.9 groups of the efficiency and head in design scheme were obtained.The effects of geometrical parameters on efficiency,head were researched using orthogonal test method.The primary and secondary factors of the design parameters were acquired by way of variance analysis.Blade wrap angle of guide vane and blade inlet angle has a greater impact on submersible pump performance.According to the test result,an optimum program to further design was put forward.After manufactured and tested,the efficiency of the final optimal design model pump at rated flow point is of 67.51% and the single-stage head is of 13.84 m.The efficiency and head were significantly improved compare with similar products and national standards.
2011 Vol. 29 (4): 312-315 [Abstract] ( 2515 ) [HTML 1KB] [ PDF 455KB] ( 1802 )
316 Analysis on pressure fluctuation of interior flow in reversible pumping system for irrigation and drainage
Yang Fan,Liu Chao,Tang Fangping,Zhou Jiren
A physical model test was adopted to study the characteristics of pressure fluctuation of reversible pumping system for irrigation and drainage by performance and cavitation test.Three measu-ring points were arranged in front-end of inlet passage,the back-end of discharge passage and outlet of guide vane.The results show that the maximum relative amplitudes of pressure fluctuation at front-end of inlet passage,the back-end of discharge passage and outlet of guide vane were 0.22,1.10 and 1.20 respectively.With the increase of flow rate,the relative amplitude of pressure fluctuation increased in the front-end of inlet passage and the back-end of outlet passage,while the relative amplitude decreased first and then increased in outlet of guide vane.In the cavitation test the relative amplitude of pressure at outlet of guide vane increased when the intake pressure decreased to a certain value.The relative amplitudes of pressure fluctuation at the measuring points under different rotational speed varied with the lifting head in the same trends.For the same head,the relative amplitude increased with the increase of rotation speed in the front-end of inlet passage and the back-end of discharge passage,while no significant regularity was found in the relationship of outlet of guide vane and variation speed.
2011 Vol. 29 (4): 316-321 [Abstract] ( 2156 ) [HTML 1KB] [ PDF 672KB] ( 1751 )
322 Investigation on field test of energy performances of large pumping station
Qiu Baoyun,Feng Xiaoli,Zhu Qingyuan,He Zhongning,Ge Qiang
In order to directly obtain operation parameters,energy performances of large pumping stations were determined on the spot and analyzed.The discharges of water pumps were measured with five-hole probes and ADCP(acoustic doppler current profiler).Pump assembly head,input power of electrical motors and pump assembly efficiency were obtained through the data measured by measuring apparatus of the pumping station.The test precision of discharge and efficiency was analyzed.The efficiency conversion methods from model to prototype of the pump and the pump assembly were checked.The results indicate that the velocity distribution in cross section measured with five-hole probes can repeat very well,which stands for the actual axial velocity distribution in cross section.The test precision of the discharge and the efficiency could be controlled within 2.0%,which could meet the demand of field test of large pumping stations.The pump discharge and pump assembly efficiency are 11.837 8 m3/s,55.998% respectively when pump assembly head is 1.73 m,which meets the design demands of the pump assembly.The efficiency of prototype pump and pump assembly is obviously higher than that of model respectively because of size effect,and could be predicted accurately based on model efficiency by related suitable formulas.
2011 Vol. 29 (4): 322-327 [Abstract] ( 2262 ) [HTML 1KB] [ PDF 449KB] ( 1841 )
328 Numerical prediction of transient discharge coefficient in orifice flow meter
Li Zhifeng,Wu Peng,Wu Dazhuan,Dai Weiping,Wang Leqin
To study the characteristics of the orifice flow meter when measuring linear accelerating flow rate,taking the curves of the transient discharge coefficient(C) as the study object,the computational fluid dynamics(CFD) method was used to simulate the C and the evolutions of the corresponding flow field.The transient turbulent flow was described by the Realizable detached eddy simulation(DES).For comparative analysis,the accelerating process was discretized to separate steady-state conditions at different points of flow rate.The Realizable k-ε model was chosen as the steady-state turbulent closure.The error between curves of present steady discharge coefficient(C0) and the ISO data is less than 3%,so the current calculation results is validated.Comparison of discharge coefficients between flow acceleration process and steady-state condition was performed.Comparison results show that the transient C curve increases from 0 to a constant value gradually and the steady C0 remained in the vicinity of 0.6.The discharge coefficient together with the evolutions of velocity and pressure field were combined to further analysis the internal flow mechanisms.Reasons of deviation between transient and steady discharge coefficients are that the vortex of the acceleration state lags behind the steady-state conditions,so the pressure energy was not able to transform into the kinetic energy at the early process within a short distance.Contents of current study can serve as the reference of the instantaneous flow measurements.
2011 Vol. 29 (4): 328-332 [Abstract] ( 2093 ) [HTML 1KB] [ PDF 721KB] ( 2287 )
333 Flow analysis based on wavelet packet decomposition for centrifugal pumps at shut- off condition
Liu Zhuqing,Bi Huili,Wang Fujun
Based on water hammer theory and the Characteristic Method,a long-pipeline pumping station system with the pipe diameter of 2.2 m was studied under the pump shutdown operation condition.The numerical results indicated that negative pressures were existed along the pipeline under the condition,and the maximum negative pressure is-5.9 m.According to the regular arrangement principles of air valves,18 air valves were installed along the pipeline to control the negative pressure.Three different flow coefficients which are 0.95 and 0.65,0.75 and 0.45,0.62 and 0.62,and three different orifice sizes which are 0.018,0.071,0.196 m2 of air valve were analyzed and compared respectively.The maximum negative pressure are-0.69,-0.70,0.71 m under three different flow coefficient,and-0.88,-0.69,-0.67 m under three different orifice sizes.It is found that the parameters combination in which air valve size is 0.196 m2,inflow coefficient is 0.95,and outflow coefficient is 0.65,is suitable for the pumping station with pipe diameter of 2.2 m
2011 Vol. 29 (4): 333-337 [Abstract] ( 2285 ) [HTML 1KB] [ PDF 562KB] ( 1708 )
338 PIV measurement on airfoil weir cross flow
Wang Zhentao,Zhang Xing,Huang Jiwei,Huang Qiaomei
In order to investigate overflow characteristics and discuss hydraulic characteristics about the airfoil weir,particle image velocimetry(PIV) technology was employed to measure the flow field over the airfoil weir which the ratio of height(P) and length(C) is 0.30 in flume under different relative water heads of 1.05,1.25,1.37,1.48 and 1.54.The flow velocity vector,streamline and vorticity under five corresponding kinds of Reynolds number(Re) were gained.The experimental results indicated that overflow characteristics including velocity and vorticity distribution regulation are same under different relative water heads or velocities.Stream lines are parallel approximately,flow is calm,and eddy was not found in the overflow near the airfoil weir wall.The airfoil weir overflow is "close to body" flow.The biggest velocity on the weir coping is 0.36 m/s in the experiment,and the velocity of weir heel and toe are less than main flow velocity and it is 0.05 m/s.It colud lessen the water flow erodibility.The vorticity which is 19.12 m2/s is biggest on the weir coping.Water flow energy dissipation on the weir coping was quickened.Dangerous pressure is avoided near the weir heel and toe where the vorticity is zero.
2011 Vol. 29 (4): 338-342 [Abstract] ( 2470 ) [HTML 1KB] [ PDF 558KB] ( 1806 )
343 Transportation characteristics of piped carriage with different Reynolds numbers
Wang Rui,Sun Xihuan,Li Yongye
 In order to solve the problems of the existing energy crisis caused by traditional means of transport,a piped hydraulic transportation technique of tube- contained raw material was put forward and an intelligence test system was designed to research the transportation characteristics of the piped carriage.Through dynamic analysis,the motional stages of the piped carriage were divided and the main power source of the motion of the piped carriage was indicated.With combination of theoretical analysis and model experiments,the transportation characteristics of the piped carriage with different Reynolds numbers were studied.The results show that the larger Reynolds number is,the larger the conveying speed of the piped carriage,the cyclical slit flowing rate and the water velocity in the pipe are,but their increase ranges are different.The conveying speed of the piped carriage increases the most,water velocity in the pipe and the cyclical slit flowing rate increases the least.When the speed of the piped carriage,the cyclical slit flowing rate and the water velocity in the pipe are equal,the piped carriage moves the most smoothly and steadily.Additionally,the conveying capacity of the piped carriage increases firstly and then decreases with the increasing of Reynolds number.While Reynolds number falls in about 160 000～210 000,the capacity reaches the maximum.Meanwhile,the motional mathematical model of the piped carriage was established with different Reynolds numbers according to the law of conservation of mass and a comparative analysis was done on its results and the experiment results.The maximum relative error is less than 9%.
2011 Vol. 29 (4): 343-346 [Abstract] ( 1910 ) [HTML 1KB] [ PDF 490KB] ( 2286 )
347 Research on inflow at low Reynolds number in square section straight Micro- channel
He Wenbo,Wang Yuan,Gong Xiaoyan,Jin Wen
To investigate inflow fields in Micro-channel at Reynolds number lower than 1,such as inflow in vascular plant,with micro-fluidic particle image velocimetry(Micro-PIV) technique and numerical simulation that simulating wall roughness elements by setting up porous medium thickness and momentum source of porous medium model in software Fluent,inflow fields in straight micro-channels with cross section of 400 μm×400 μm under the conditions of the Reynolds number of 0.15,0.25 and 0.35 were obtained respectively.The velocity distributions were compared with analytical solution adopted by solving governing equations directly.The result shows that effect from wall roughness on the velocity distributions is small but not ignorable in micro-channel,so the analytical solution cannot meet the experimental results.The profile has the same tendency,but the value is lower in the mean flow area,which is distant from horizontal axis less than 0.04 mm,and higher in other region near the wall.Velocity distributions derived by the numerical simulation meet the experimental results well,so this numerical simulation can be successfully used in handling inflow problems at low Reynolds number in square section straight micro-channel.
2011 Vol. 29 (4): 347-351 [Abstract] ( 3127 ) [HTML 1KB] [ PDF 569KB] ( 3423 )
352 Short- term prediction of chaotic hourly water consumption based on united time series
Zhang Qin,Wang Xionghai,Zhu Qingjian
 Aiming at the high short-term prediction accuracy of hourly water consumption in water supply optimal operation,a united time series method was proposed based on horizontal period clustering and vertical residual modification.The horizontal time series were determined as research samples by pattern recognition with high relevancy.After the phase space of horizontal period clustering was restructured,chaotic characteristics of typical period data were analyzed and chaotic prediction model was established.Least square support vector machine was used as a forecasting tool to obtain period flows.Furthermore,to track water consumptions dynamically,vertical residuals were modified by grey model prediction after collecting real-time data.The period historical data from Xiaoshan were supplied in the normal and abnormal case study to forecast the day-ahead hourly water consumption,and prediction accuracy with different methods were compared.Test results show that the method is adept in the short-term forecasting this kind of chaotic time series,which reflects the characters of typical days and real-time water variations.And the new method outperforms other methods obviously,thus it can better satisfy the demands for optimal operation of water distribution system.
2011 Vol. 29 (4): 352-358 [Abstract] ( 1821 ) [HTML 1KB] [ PDF 600KB] ( 2008 )
359 Numerical simulation for influence of throat diameter on Venturi injector performance
Yan Haijun,Chu Xiaoyi
The flow inside a Venturi injector was investigated numerically by Fluent software based on Reynolds-averaged Navier-Stokes equations and Standard k-ε turbulent model,and the reliability of calculations was examined and validated. 15 different throat structures constituted by inlet diameters as 4,5,and 6mm,respectively,and diameter ratio λ of outlet diamer to inlet diameter as 1.0,1.1,1.2,1.3 and 1.4,respectively,were conducted for predicting injection performance. The results showed that the throat diameter has some influence on the internal flow behaviour of throat and diffusion pipe,injection performance and efficiency.The diameter ratio λ of outlet diamer to inlet diameter for Venturi throat has more influence on the injection performance than the throat inlet diameter.According to the principle of high efficiency,the range of diameter ratio is from 1.2 to 1.3.The regression models between injection efficiency and ratio of injection rate to inlet flow rate were established when λ was either 1.2 or 1.3,and their maximum efficiency was predicted.The Venturi injector with the throat inlet diameter of 4mm and diameter ratio of 1.3 can achieve the highest effeciency of 15.5%,having no vortex inside the diffusion pipe and less average turbulent energy at the same cross sections compared with diameter ratio of 1.0.The research results provide a theoretical reference for optimal design of Venturi injector.
2011 Vol. 29 (4): 359-363 [Abstract] ( 2466 ) [HTML 1KB] [ PDF 509KB] ( 2128 )
364 Hill orchard irrigation control system based on wireless sensor networks
Wang Xinzhong,Gu Kaixin,Liu Fei
In order to solve existing problems of excessive irrigation and waste water in hill orchard,a technology of water-saving irrigation was studied.A design of hilly orchard irrigation control system based on wireless sensor networks was proposed combined with wireless sensor network technology.It took single-chip ATmega128L as the control core,including host computer,sink node,wireless sensor node,soil moisture sensor and solenoid valves.Soil moisture sensor and solenoid valves were connected to wireless sensor node.Data was transmitted by wireless style between sink node and wireless sensor node.Sink node was connected to host computer by RS-232 serial cable.The system can monitor real-time soil moisture of grapes.The system judges whether grape is water shortages according to soil moisture,then send out the irrigation instructions to implement the precise irrigation of grapes.The irrigation automation control of vineyard is achieved.When the soil moisture is reduced to 26.6% in the depth of 25 cm,the irrigation is started for the grape.When the soil moisture is achieved to 45.5% in the depth of 50 cm,the irrigation is stopped for the grape.The experiment shows that the system has achieved precise irrigation and realized water-saving irrigation combining with the survival threshold of grapes.
2011 Vol. 29 (4): 364-368 [Abstract] ( 2388 ) [HTML 1KB] [ PDF 445KB] ( 1869 )
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