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Journal of Drainage and Irrigation Machinery Engin
 
2007 Vol.25 Issue.2
Published 2007-03-25
article
Article
1 Technology evaluation of single-stage and single-suction rinsing centrifugal pump
MU Jie-gang, ZHANG Xin, HUANG Zhong-hong
The technology development of net positive suction(NPSH) performance indexes about single-stage and single-suction rinsing centrifugal pumps is evaluated.More than 3 000 sample values of performance indexes about vertical and horizontal pumps are collected and compared,and these statistic and neat data are analyzed in detail.Based on these data,it is pointed out that the sample values are inconsistent with measuring ones,performance indexes under low rotating speed are better,and efficiency performance indexes are lower for vertical pumps.centrifugal pump;single-stage and single-suction;efficiency;NPSH
2007 Vol. 25 (2): 1-4 [Abstract] ( 1095 ) [HTML 1KB] [ PDF 251KB] ( 1519 )
5 Numerical simulation of interior flow and wear character in slurry pumps
LI Ren-nian, XU Zhen-fa, HAN Wei, SU Ji-xin, WANG Hao
The flow field in the slurry pump is simulated by using the κ-ε two equations model and SIMPLE arithmetic.The distribution of velocity and solid particles and the information of axial vortex in the impeller and volute are discovered.The distributions of particles under the condition of different initial concentrations and diameters in the pump are compared.The effects of the initial concentration and diameter of solid particles to the wear character of the impeller and volute are analyzed.slurry pump;impeller;wear;numerical simulation
2007 Vol. 25 (2): 5-8 [Abstract] ( 1145 ) [HTML 1KB] [ PDF 287KB] ( 1207 )
9 Determination of key parameters for the auto-coupled device of 600QW3500-16-220 submersible sewage pump
ZHU Rong-sheng, LUO Ren-cai, WU Jun, LI Wei-bin, YANG Ai-lin
Taking the 600QW3500-16-220 sewage submarine pump as an example,by analyzing the force and moment inside pump,the key parameters in the design are summarized,and the problem about the leak and strength of the auto-coupled device are solved.The key parameters are related to the hydrodynamic parameters and its weight.By analyzing the force of the draining base,the choice and the distribution in the bolts in the draining base are determined.submersible sewage pump;auto-coupled setting;auto-coupled locking angle
2007 Vol. 25 (2): 9-12 [Abstract] ( 1215 ) [HTML 1KB] [ PDF 255KB] ( 1097 )
13 Improvement design and calculation of the seal for high pressure hot water circulating pump
HE Yu-jie, DING Ming-zhi, SHI Hai-xia
In this paper,the cause of mechanical seal leakage under the high temperature and pressure is analyzed for high temperature hot water circulating pump under the operating conditions.The tandem two-stage mechanical seal is proposed for the improvement scheme.The detailed design calculations are carried out on the mechanical seal.The structural design of mechanical seal and practical application of 4 000 hours operation of the sealing system are demonstrated.The service life of the mechanical seal for the high pressure hot water circulating pump is improved,and thus good economic benefit is achieved.
2007 Vol. 25 (2): 13-15 [Abstract] ( 1156 ) [HTML 1KB] [ PDF 188KB] ( 1162 )
16 Numerical simulation of the slurry consistence through the impeller of the slurry pump
WANG Chun-lin, LI Ting-ting, MA Qing-yong, XING Yan, HU Bin-bin
The flow structure and the slurry consistence of the particle-liquid two-phase flows through the impeller of the centrifugal slurry pump are studied.By using FLUENT code and the kinetic theory of granular flow,the three-dimensional turbulent particle-liquid two-phase flow through the impeller has been simulated.The calculated results give the distribution of the particle and the flow structure,and help to understand the main region of the abrasion of the impeller and to improve the hydraulic design of the impeller for decreasing the abrasion and increasing the useful life of the pump.Numerical simulations on granule concentration distribution concerning granule diameter of 0.5 mm,1 mm and 2 mm are carried out.From the analysis of the phase volume distribution map of granule,it is shown that the simulated results agree well with the experiments.slurry pump;consistence;impeller;numerical simulation
2007 Vol. 25 (2): 16-18 [Abstract] ( 1065 ) [HTML 1KB] [ PDF 292KB] ( 1576 )
19 Study on strength checking data model for pump parts
JIANG Xiao-ping, SHI Wei-dong, LI Wei, WANG Xing-yuan, WANG Zhun
Strength checking of pump parts is necessary in the design of pumps.In order to solve the problem that conventional methods of strength checking are deficient in design precision and efficiency,a software about pump parts strength checking on VC++ 6.0 has been developed with the technique of data reading and treating intelligently.The software includes several modules that are independent in structure but common in parameters.The main operand of pump parts strength checking is all kinds of data during the course of strength checking.Data models that are logical and can operate reliably are established based on overall analysis about these data.The implementation methods of the data models and the method which uses ADO to read material data from database files directly are also presented.The real operation indicates that the data models is stable,rational and reliable.pumps;strength checking;data models;interface of ADO;Visual C++
2007 Vol. 25 (2): 19-22 [Abstract] ( 1219 ) [HTML 1KB] [ PDF 288KB] ( 1827 )
23 Strength calculation for plastic pump impeller
MA Xin-hua, SANG Jian-guo, LI Juan, LIU Hou-lin
Impeller stress for pumps made of engineering plastics was analysed.The coefficients of k1 for various ns were summarized.The strength calculating formula for the impeller was obtained based on simplified model and cover board theory.The strength of pump impeller made of engineering plastics in common use was proofreaded by using this formula.The results show that UHMWPE and PP can be used in limited field and PPO and PVDF are the best,which provide the theory for engineering plastics choice.impeller;engineering plastics;strength;stress
2007 Vol. 25 (2): 23-25 [Abstract] ( 1748 ) [HTML 1KB] [ PDF 160KB] ( 1613 )
26 Study on anti-cavitation of shielded pumps
REN Xiao-feng, LIU Jian-rui, LI Wen-ke, WEN Jie
The small flow,low specific speed and high cavity requirement of the canned motor pump is introduced.Its structure,working principle and the function characteristics are analyzed.The reason of the cavitation,and the measure of anti-cavitation are discussed.The design method includes: to select larger impeller inlet diameter Dj,suitable inlet vane angle β1,shape of the vane inlet,vane′s number,shape of the impeller inlet channel,and so on.The service tests of two canned motor pumps are carried out to determine the relation of Δhc and Q.The test results show that the pump characteristics meet the design requirements.shielded pump;cavitation;measure
2007 Vol. 25 (2): 26-29 [Abstract] ( 1318 ) [HTML 1KB] [ PDF 236KB] ( 1201 )
30 Special software development in selecting hydraulic model of axial flow pump
YU Yong-hai, JIANG Xiao-ming
There exist some relationships between the pump and the pump system.The method and procedure of selection of hydraulic model pump are presented.According to the above method,the efficiency of pump system is increased.The special software to select hydraulic model pump has been developed with Matlab and Visual C++ based on the data from the results of the Tianjin test.When the parameters of pumping station,the suitable hydraulic model pump,the rotating speed and the diameter of impeller of prototype pump are inputted,the curves of comprehensive characteristic will be obtained.The software has high value in the selection of axial flow pump.axial flow pump;hydraulic model pump;selection of pump;software
2007 Vol. 25 (2): 30-32 [Abstract] ( 1231 ) [HTML 1KB] [ PDF 246KB] ( 1465 )
33 Analysis of variable speed operation characters on parallel centrifugal pump groups in pump station
HAN Wei, LI Ren-nian, SU Min, LI Qi-fei, LI De-shun
The parallel-connection operation characters of the centrifugal pump groups with the same type and pipeline layout are discussed.By simplifying the restrictions of pipeline the variable-speed operation characters of the parallel-connection centrifugal pump groups are analyzed based on the centrifugal pump performance and the similarity principle.The variable-speed mathematical model under the restrained condition of system flow fate is established,based on which the variable-speed operation characteristics are discussed and the relevant calculation methods are given.centrifugal pump group;parallel-connection;variable-speed;operation characters;pump station
2007 Vol. 25 (2): 33-36 [Abstract] ( 1296 ) [HTML 1KB] [ PDF 246KB] ( 1375 )
37 Optimim design for siphon outlet of liulaojian No.2 pumping station
GU Mei-juan, BU Ge, LU Lin-guang, CHEN A-ping, HUANG Jin-jun
In order to obtain the best hydraulic performance of the siphon outlet within the given control dimensions,a 3D turbulent numerical calculation was conducted to optimize the design of the outlet for Liulaojian No.2 Pumping Station.The results of the calculation show that the shape of siphon outlet dominantly influence the hydraulic loss of outlet.Excellent hydraulic performance of siphon outlet could be obtained by the numerical optimum design.siphon outlet;optimum hydraulic calculation;numerical simulation
2007 Vol. 25 (2): 37-39 [Abstract] ( 1132 ) [HTML 1KB] [ PDF 319KB] ( 1568 )
40 Study on the distributing constant pressure automatic irrigation system
HUANG Xiu-qiao, GAO Sheng-guo, YU Si-ting, QI Xue-bin, GUO Zhi-xin
In this paper the structure of automatic irrigaton system of distributing contant pressure,the design method of softwares and hardwares,and engineering examples are studied.The phenomenon of pipe explosion because of "water hammer"is avoided effectively through the applying of variable frequency speed regulation of multi-function and the implement of means of soft start and shut.The cost of engineering structure,maintainment and management are reduced greatly through the adoption of some measures,such as the distributing system structure,the combination of wire and wireless.By using the special circuit and the abnormal means of handlement,adding 100 V alternate current to the commom circuit point,we can solve the difficult problem of decayed circuit point which affect the long-term credibility of the system in the bad sitution.constant irrigation;automatic controlled system;variable frequency speed regulation;construction cost;maintain expenses
2007 Vol. 25 (2): 40-44 [Abstract] ( 1246 ) [HTML 1KB] [ PDF 421KB] ( 1141 )
45 Experimental study on particle diameter distributions in the electrostatic pressure-swirl nozzle
JIN Chao-hua, LUO Ti-qian, ZOU Xiao-lin
In order to study the pressure-swirl nozzle′s atomization characteristic,the particle diameter distributions along axis of the nozzle have been measured by immerging.Three alterable experimental parameters were chosen: liquid pressure,flux and electrostatic voltage.The experimental results show that,with the increase of three parameters the diameters of the droplets will all decrease.It is found that the three parameters can influence each other on the distribution of the liquid particles and the electrostatic voltage has the biggest effect.pressure-swirl nozzle;electrostatic;spray;particle distributing
2007 Vol. 25 (2): 45-48 [Abstract] ( 1454 ) [HTML 1KB] [ PDF 297KB] ( 1145 )
49 Diagnosing the running condition of pump by its vibration character
NI Yong-yan, YUAN Shou-qi, PAN Zhong-yong, YUAN Jian-ping
Axial thrust and radial force will increase at off-design condition,which can be explained by a modulus defined specially.The blades of impeller and the tongue of casing are treated as fluid obstacles.The emission frequency of the Karman vortex street occurred in series from the blades and tongue is varing with the running condition.Vibration signals that are acquired by accumulation transducers match with the variation of the conditions.According to the analysis of the vibration signals,the frequency at the point of maximum amplitude is assured to be the passing frequency of blade,and the emission frequency of the Karman vortex street is also abstracted.The running condition is determined finally by the non-dimensional magnitude of the amplitude of the above mentioned emission frequency.process pump;Karman vortex street;running condition;spectrum analyzing
2007 Vol. 25 (2): 49-52 [Abstract] ( 1185 ) [HTML 1KB] [ PDF 339KB] ( 1143 )
53 Pump performance verification method in GB/T 3216
HE Xi-jie, DI Li-hui, CHANG Yan-hui
The verification of capacity,head and efficiency of pumps,and NPSHR in the ISO 9906 and GB/T 3216 are studied.Based on the guarantee value of performance in the standard,the guarantee condition satified by the performance in the standard is discussed and the mathematical expressions about the value verification of capacity,head,efficiency and NPSHR are presented respectively.The technical problem on the verification by computer in the computer aided test has been solved.The verification methods in the old and new standards are compared at the same time.GB/T 3216;ISO 9906;standard;performance;verification
2007 Vol. 25 (2): 53-56 [Abstract] ( 2370 ) [HTML 1KB] [ PDF 279KB] ( 1334 )
57 Numerical simulation on charged droplets breakup in high velocity gas flow
LUO Ti-qian, WANG Xiao-ying, ZHENG Jie-qing, WANG Zhen-tao, MAO Hui-ming
It is very difficult to do experiment because the process of charged droplet breakup is complex and instantaneous.In this paper,several factors that influence the charged droplet breakup process are analyzed by deducing the ression of Weber,which are gas-liquid relative velocity,gas-liquid parameters and electrostatic field.Then,the breakup process is simulated by choosing VOF multi-phase model,quadrangle grid and SIMPLE method.The simulation of droplet breakup shows breakup model may be bag breakup,shear breakup or explosion breakup.For low viscosity liquid,the Weber number can be the main criterion of breakup model.With the same parameter,charged droplet is easier to breakup than uncharged droplet,because the Weber number of charged droplet is larger.droplet breakup;high velocity gas flow;electrostatic
2007 Vol. 25 (2): 57-60 [Abstract] ( 1244 ) [HTML 1KB] [ PDF 336KB] ( 1414 )
61 Experimental study on membrance aeration bioreactor
WEN Jian-long, SONG Xiao-ning, WANG Zhen-tao, TANG Zhi-hua
In order to culture the cell of the microbe and flora or fauna, under the environment of rich nutrition,high density,rich dissolved oxygen,and high viscosity,a new membrane aeration bioreactor is developed.The key part is the distribution of membrane aeration bioreactor.The flow characteristic,pressure reduction,air-contained rate for the reactor which assembled many kinds of air distribution are studied,the best air distribution is chosen.The result indicate that this kind of membrane bioreactors can generate homogeneous air bubble,have high rate of oxygen supply,have good nature of blending and have no mechanical shear damage on mediator.Compared to mechanical string membrane bioreactor,the reactor can save about half of electric energy and can be widely used in medium and small-sized reactor.bioreactor;membrane;admixture;air rate;energy save
2007 Vol. 25 (2): 61-64 [Abstract] ( 1191 ) [HTML 1KB] [ PDF 274KB] ( 1268 )
65 Current situation and prospect of jet pumps
WU Jun, YUAN Dan-qing, WANG Guan-jun, LIU Ji-chun
The jet pump′s basic characteristic,structure and working principle are outlined.The development status of the jet pump including the design theory,internal flow and basic applications are discussed.As one of the liquid transportation machines and mixing reaction equipments,jet pump has no moving parts.Jet pump has special structure and works reliablely.It will enhance the device suction and improve cavitation characteristics if jet pump works with other pumps.The pumps are widely used in agriculture,water conservancy,traffic and environmental protection.The development tendency of jet pumps are also predicted.jet pump;characteristic;current situation;tendency;theory foundation
2007 Vol. 25 (2): 65-68 [Abstract] ( 2033 ) [HTML 1KB] [ PDF 338KB] ( 2464 )
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