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Journal of Drainage and Irrigation Machinery Engin
 
2019 Vol.37 Issue.2
Published 2019-02-25

article
article
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2019 Vol. 37 (2): 1- [Abstract] ( 152 ) [HTML 1KB] [ PDF 1171KB] ( 185 )
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2019 Vol. 37 (2): 2- [Abstract] ( 155 ) [HTML 1KB] [ PDF 250KB] ( 180 )
93 Computational study of fluid borne noise in vertical inline pump
CHRISTOPHER Stephen, YUAN Shouqi, PEI Ji, CHENG Xing
2019 Vol. 37 (2): 93-99 [Abstract] ( 197 ) [HTML 1KB] [ PDF 3200KB] ( 255 )
100 Numerical simulation and experiment of cavitation performance on CAP1400 nuclear reactor coolant model pump
WANG Wei, WANG Yayun, TANG Tao, LIN Yin, WANG Xiaofang
In order to investigate the cavitation performance of CAP1400 reactor coolant pump, the standard k-ε model and mixture model was applied to simulate the cavitating flow in a 1∶2.5 CAP1400 model pump. The cavitation inception was reaveled and cavitation development in the impeller and the blade loading characteristics on the middle stream line at different NPSH were analyzed. Furthermore, the cavitation experiment was carried out with sand casting guide vane combined with precision casting aluminum alloy impeller and sand casting impeller respectively. The results we obtained were: the relative position of the volute and impeller has a certain effect on the vapor volume fraction distribution in the impeller and the cavitation is more serious on the suction surface of blade near the outlet of the volute. Blockage effect of cavitation changes the flow angle near the leading edge of blade which causes the cavitation arising on the pressure surface near the leading edge. Blade loading is significantly influenced by cavitation. Blade loading along the streamline has a maximum value near the end of vapor on the suction surface. Uneven distribution of the vapor in the impeller increases the difference of blade loading among different blades. The manufacturing precision of the impeller has a great impact on the cavitation performance of pump. 
2019 Vol. 37 (2): 100-105 [Abstract] ( 220 ) [HTML 1KB] [ PDF 4316KB] ( 283 )
106 Numerical simulation on centrifugal pump compressible flow field with different gas volume fractions
WANG Like, LIAO Weili, LU Jinling, LUO Xingqi, RUAN Hui, ZHAO Yaping, WANG Jing
2019 Vol. 37 (2): 106-111 [Abstract] ( 206 ) [HTML 1KB] [ PDF 3747KB] ( 185 )
112 Numerical simulation of startup process of mixed flow pump unit combined with hydraulic control butterfly valve action
ZHOU Daqing, JIANG Shengwen, CHEN Huixiang
The startup transient characteristics of a mixed flow pump with a hydraulic controlled butterfly was predicted using the unsteady numerical approach based on the method of sliding grid to realize the opening rule of butterfly valve after the establishment of the whole flow system geometrical model of the pump station. Then the external characteristics of the pump unit and static pressure at monitoring points against time as well as the internal flow transient changes were obtained. Numerical results show that the maximum reverse speed of the starting process of the unit is 0.16 times the rated speed, and the highest pressure in the pump outlet is 1.26 times the rated value, and neither of them exceeds the permissible value. When the unit speed shows a stable tendency, the flow characteristics and the pressure gradient change in the pump are mainly affected by the butterfly valve opening. While at the small opening , the pressure gradient in the pump is larger, and the maximum differential pressure reaches 456 m(1.62 times the rated lift). The high pressure water flows through the butterfly valve in the form of the jet and generates a backflow on the outlet side, which results in a drastic fluctuation of the differential pressure on both sides of the butterfly valve and easily induces the vibration of the valve body.
2019 Vol. 37 (2): 112-117 [Abstract] ( 356 ) [HTML 1KB] [ PDF 4531KB] ( 289 )
118 Numerical simulation on transient characteristics during startup period of the snorkeling fire pump
GUO Guangqiang, ZHANG Renhui, ZHAO Wanyong, YANG Junhu, HUANG Qi
In order to study the transient characteristics of the snorkeling fire pump in the process of the startup, a threedimensional model was established, which included pump,water tank and circulation pipeline. By using Fluent 145 commercial software,RNG k-ε turbulence model, combined with UDF program loading speed change rule was used to carry out unsteady numerical simulation.The change [JP2]rules of flow rate and head and impeller′s [JP]acceleration torque and total efficiency and impeller′s axial force and radial force during the startup were analyzed.The results show that flow rate,head and total efficiency increase exponentially in the process of startup,which mainly depends on the startup characteristics of the driving motor, the acceleration torque of impeller decreases in the process of startup,when the pump speed reaches the maximum rating speed, the acceleration torque becomes zero. Because the flow rate is seriously deviated from the rated flow,which result in larger axial force and radial force at the very beginning of startup,with the increase of startup time, axial force and radial force gradually decrease and finally stabilize.The research provides a theoretical reference for the optimization design, vibration and noise diagnosis of centrifugal pumps.
2019 Vol. 37 (2): 118-123 [Abstract] ( 247 ) [HTML 1KB] [ PDF 5264KB] ( 207 )
124 Research on the approachto water resources optimal allocation of the joint operation of Shanhu Reservoir and its two pumping stations
GONG Zhihao, CHENG Jilin, YANG Shutan, CHANG Benchun, JIANG Yong, GONG Yi
An optimization model was constructed for the joint operation of a reservoir and two pumping stations, one of which lifted water into the reservoir while the other lifted water out of it. The model was developed with the objective of minimizing the annual sum of squared deviation of target water quantity in each period, taking the quantity of water the reservoir supplied and the pumping station lifted out as two decision variables. Constraints included annual total quantity of water the reservoir could supply, capacity of the watertransfer pumping station and joint operation rules of them. The system of Shanhu Reservoir and its two pumping stations was taken as an example which was solved by DPSA and the optimal water supply quantity, surplus water quantity, water supplement quantity and watertransfer quantity were achieved. The result shows that optimal operation of reservoir and pumping stations can decrease the water shortage from 16×104〖KG*4〗m3 〖JP2〗to 8.6×104〖KG*4〗m3, let the pumping station operate under a stable condition and increase watertransfer quantity from 380×104〖KG*4〗m3 to 390×104〖KG*4〗m3. The result can be applied to the operation and management of irrigation area with similar water supply system.
2019 Vol. 37 (2): 124-129 [Abstract] ( 184 ) [HTML 1KB] [ PDF 1795KB] ( 201 )
130 Hydraulic torque characteristics of guide vane at turbine mode in a pump turbine
LI Qifei, LI Guangxian, LI Rennian, WANG Renben, CHEN Yu
Based on hydrodynamic torque test of the guide vane with the highest head in turbine mode of a pump turbine, the computational fluid dynamics (CFD) method is used to analyze the flow field characteristics. Standard k-ε twoequation model is used in steady simulation. SST kω twoequation model is used to unsteady simulation and the internal flow field characteristics analysis. The results show the efficiency inaccuracy between the numerical simulation and the experimental values within the allowed range. The numerical simulation results of the hydraulic torque are consistent with the experiment results in all openings. When the opening is 13 mm, there is a reflux and vortex flow in the vaneless space and the runner filed. When the opening is 49mm, boundary layer separation flow is found on the guide vane suction surface close to the trailing edge. The torque value of guide vanes has similar change regulation to the static pressure value changes near the guide, and the torque value fluctuates periodically in a small range.
2019 Vol. 37 (2): 130-135 [Abstract] ( 252 ) [HTML 1KB] [ PDF 4849KB] ( 234 )
136 Effects of guide strip angles on hydraulic characteristics of moving boundary annular gap flow
ZHANG Chunjin, SUN Xihuan, LI Yongye, ZHANG Xueqin
In order to further explore the effects of different guide strip angles on hydraulic characteristics of moving boundary annular gap flow of piped carriage, through model tests and theoretical analyses, the guide strips with angles of 10°, 15°, 20° and 25° respectively were studied. The test section was located within the straight pipeline of test system, whose control volume was 40 m3/h, using the loadings of the piped carriage 600 g. The results showed that, with the increase of the angles of the guide strip, the maximum value of the axial flow velocity and the circumferential flow velocity increased gradually, the maximum value of the radial velocity decreased gradually, and the pressure increased first and then decreased. With the same guide strips angles, the circumferential velocity and radial velocity of the annular gap flow of the piped carriage lc×dc=100 mm×70 mm (lc was the length of the barrel, dc was the diameter of the barrel) were the largest among three types of the piped carriages, and the axial velocity and pressure of the annular gap flow of the piped carriage lc×dc=150 mm×60 mm were the largest among three types of the piped carriages. The hydraulic characteristics of the annular gap flow of the piped carriage existed mainly in the nearwall areas of the flow field on both sides of guide strips. The study of this paper will enrich the annular gap flow theories and provide a theoretical basis for the design of guide strips.
2019 Vol. 37 (2): 136-141 [Abstract] ( 184 ) [HTML 1KB] [ PDF 9985KB] ( 165 )
142 Experimental investigation of crossflow characteristics in a multijets system at small nozzletoplate spacing
ZHU Keqian, SUN Tao, YU Pingping, LI Meixiang, YUAN Ningyi, DING Jianning
2019 Vol. 37 (2): 142-147 [Abstract] ( 177 ) [HTML 1KB] [ PDF 2010KB] ( 190 )
148 Approximate analytic analysis on performance of spiral groove liquid film mechanical seal being applied to seal power-law fluid
CHEN Guo, SONG Pengyun
In order to deeply analyze the performance of the spiral groove upstream pumping liquid mechanical seal when the seal medium is non-Newtonian fluid, taking power-law fluid as the research object, the Reynolds equation and the twodimensional steady flow flowing equation of Newtonian fluid were respectively replaced by the Reynolds equation and the flowing equation of power-law fluid based on Muijderman’s pressure governing equation for Newtonian liquid lubricated bearing. Then the pressure distribution and the sealing performance parameters of the seal, such as the opening force and the leakage, were obtained. A comparison was made with the results for the approximate analytic method and the numerical simulation by Fluent software and the results between the two are consistent. The influence of consistency coefficient m and flow behavior index n on the seal performance was analyzed by the approximate analytic method. The results show that the opening force increases with the increasing of the flow behavior index n and the consistency coefficient m. When the sealed medium is pseudoplastic fluid, the effect of flow behavior index n and the consistency coefficient m on the leakage is weak at small film thickness, [JP2]whereas the leakage increases with the increasing of the flow index n and the consistency coefficient m at large film thickness. The effects of flow behavior index n and the consistency coefficient m on the leakage can be ignored when the sealed medium is bulging plastic fluid.
2019 Vol. 37 (2): 148-153 [Abstract] ( 210 ) [HTML 1KB] [ PDF 1271KB] ( 215 )
154 Applicability comparison of water resources optimization model based on effect evaluation
ZHANG Yan, GUO Ping, ZHANG Fan, TANG Yikuan
In order to compare the applicability of water resource optimal allocation models with different objectives, including maximum agricultural water productivity, minimum agricultural irrigation loss and maximum net economic efficiency, in the middle reaches of the Heihe River Basin, we developed optimal water allocation models with fully considering the stochastic character of surface water. The multiindex comprehensive evaluation method and the entropy weighted model were introduced to evaluate the effectiveness of the three optimization models. Evaluation results show that the model of the maximum agricultural water productivity as the objective function in the irrigation area is more suitable for the water resources allocation requirements in the middle reaches of the Heihe River Basin from the comparison of the water resources utilization. Through optimization model with objective of maximum agricultural water productivity, the overall water consumption of the water allocation plan has decreased 334×108 m3, the irrigation water productivity has increased 0453 kg/m3, and the water costs have decreased by 421×107 Yuan. The obtained results verify the feasibility of the water resources optimization model.
2019 Vol. 37 (2): 154-159 [Abstract] ( 203 ) [HTML 1KB] [ PDF 1184KB] ( 160 )
160 Response of artificial forests soil moisture on climate characteristics in loess region
FU Na, SONG Xiaoyu, XIA Lu, LI Lanjun, LI Huaiyou, LI Yaolin
The research was based on the Chinese pine, locust and arborvitae in Nanxiaohegou watershed, which was located in Qingyang city, Gansu province. The soil moisture of crop growing season from 2003 to 2012 was continuously observed. The difference of soil moisture content in different years, months and depths was analyzed by Duncan method.The response of soil moisture was researched in different soil depths to precipitation, temperature, SPEI in different artificial forests in Nanxiaohegou watershed. The results show that soil moisture content is decreased with the increase of soil depth, and held relatively stable ranges for a long time. The difference of Chinese pine woodland reflected at soil depths of 20 cm and 60 cm, showing three levels of variation, that of locust woodland showed at 20 cm and 40 cm depths, and that of arborvitae soil water content appeared at 40 cm depth of the difference. Moreover the correlation of soil water content and precipitation, temperature and SPEI was decreased with the increase of soil depth in the same type of plantation in Nanxiaohegou watershed. SPEI index was influenced by temperature and precipitation, therefore soil moisture content decreased with the increase of the temperature, and increased with the increase of the precipitation and SPEI index. The temperature, the precipitation and SPEI had the greatest effect on the soil water content of locust in Nanxiaohegou watershed.
2019 Vol. 37 (2): 160-165 [Abstract] ( 212 ) [HTML 1KB] [ PDF 1523KB] ( 160 )
166 Effects of water temperature on soil water infiltration characteristics under drip irrigation
LIU Lihua, FEI Liangjun, ZHU Hongyan
In order to determine the effect of different water temperature on soil water infiltration characteristics of drip irrigation, the research about Xi′an Silty loam water infiltration has been carried out by drip irrigation simulation experiment at the water temperature of 4, 20, 30, 40 ℃. The results show that: The migration distance of the wetting front increases with the infiltration time. at the same infiltration time, with the water temperature rising, the migration distance of the wetting front and dripper discharge will increase. The model of horizontal (vertical) migration distance of the wetting front, the infiltration time and water temperature was established under the condition of drip irrigation water infiltration at different water temperatures, its correlation coefficient is greater than 097. The average moisture content of the wetted body is closely related to the infiltration water temperature and time. The higher the infiltration water temperature, the smaller the average water content of the soil. The isolpeth map of soil moisture content in the wetted body are closer to the drip distance from near to far and from the sparse to the dense distribution. With the infiltration of water temperature continues to rise, infiltration into the same depth of time required to gradually reduce and the greater the impact on soil temperature. The change of soil layer temperature in the depth range of 15 cm below soil surface is more prominent within 400 minutes of infiltration time. The conclusion could provide the reference for further studies of drip irrigation technology.
2019 Vol. 37 (2): 166-173 [Abstract] ( 190 ) [HTML 1KB] [ PDF 3743KB] ( 153 )
174 Effects of sprinkler irrigation and fertilization on water dynamic and yield of spring wheat
ZHU Zhongrui, FAN Yongshen, DUAN Fuyi, CHEN Zhen
In order to explore the suitable sprinkler irrigation and fertilization system for spring wheat in Hexi Corridor, the local surface irrigation model was used as a contrast to analyze the dynamic distribution of soil moisture and yield effects under the different irrigation methods, irrigation and fertilization levels. In addition, a regression analysis was conducted on the yield of spring wheat. The main content of this research consisted of the dynamics of soil water distribution before and after irrigation under sprinkler irrigation, soil water content variation characteristics under different growth periods and the soil water infiltration under different irrigation levels. Last but not least, the effects of different irrigation and top dressing levels on the yield and its components were analyzed. The results show that when the sprinkler irrigation quota is 75 mm, some water infiltrates below the active layer of the main root system of spring wheat, but the amount is less than the volume of the surface irrigation; when the quota is between 45 and 60 mm, most of water is stored in 0-40 cm soil layer. During the whole growth period of spring wheat, under medium irrigation level, the soil water content in the 40-80 cm soil layer is not significantly changed. Then the more important findings is that the yield and its components of spring wheat respond more strongly to the irrigation quantity than fertilization. When the irrigation quantity is too large, the yield will be declining. Under sprinkler irrigation, the productivity is 11.05% higher than that of surface under medium irrigation and top dressing level, and the effects of watersaving and yieldincreasing are significant. Additionally, according to yield fitting equation and WUE, the medium level of sprinkler irrigation and fertilization is the most suitable system in the area.
2019 Vol. 37 (2): 174-178 [Abstract] ( 199 ) [HTML 1KB] [ PDF 1564KB] ( 220 )
179 Design of navigation control system for largesize greenhouse ground mobile irrigator
PAN Jiandong, LI Wei, ZHANG Kangcheng, WU Sunyang, REN Wei
In view of the shortcomings of the suspension mobile sprinkler and the shortage of AGV research in the largesize greenhouse area, a navigation control system for the new greenhouse ground mobile irrigator was designed. The steering mode of the chassis was differential steering and there were six wheels installed on the chassis. Two driving wheels were installed on the center of the chassis symmetrically and four universal wheels were installed on the front end and the rear end of the chassis symmetrically. A STM32F103ZET6 microcontroller was adopted as the main control chip and the tape navigation was adopted as the navigation mode. The motion mathematical model of the irrigator was established and the motion controller was designed according to the fuzzy control theory. Besides, the navigation motion control subroutine was designed as well. The result of the model machine running test showed that when the initial offset angle of the irrigator and the tape was less than 25°, the magnetic sensor center would overlap with the tape center again as a result of the adjustment of the controller and the adjustment time increased with the initial offset angle. When the initial offset angle was too big, the model machine would leave the tape path at last. In order to ensure that the irrigator can adjust itself automatically at the beginning of the work and travel along with the tape path, the initial offset angle should not be too big. This research can provide a reference for design and application of largesize greenhouse ground mobile irrigator.
2019 Vol. 37 (2): 179-184 [Abstract] ( 236 ) [HTML 1KB] [ PDF 2362KB] ( 151 )
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