[an error occurred while processing this directive]
排灌机械工程学报
   Home  About Journal  Editorial Board  Instructions for Authors    中文 
 
　

Office Online

 　
　  Author Center
　  Peer Review
　  Editor Work
　  Office Work
　  Editor-in-chief
　

Journal Online

 　
　  Forthcoming Articles
　  Current Issue
　  Next Issue
　  Archive
　  Read Articles
　  Download Articles
　  Email Alert
　  
Quick Search  
  Advanced Search
Journal of Drainage and Irrigation Machinery Engin
 
2009 Vol.27 Issue.4
Published 2009-07-30
article
Article
205 Numerical analysis of radial force in double-suction centrifugal pumps
Zhao Wanyong,Zhang Liang,Luo Jun
Numerical calculation of the internal flow field in a double suction centrifugal pump was performed by commercial CFD software.The static pressures along circumferential and axial directions on impeller-volute coupling surface were calculated.By comparing the experimental results with numerical calculations,good agreement was obtained,the relative error is less than 5%,and the tendency of pressure distribution for impeller exit from numerical calculation is consistent with the experimental one.The radial force and its components were calculated with the outlet pressure method.The results show that the application of numerical model to calculate the radial force of the centrifugal pump has certain accuracy.At small flow condition,the radial force decreases with the increase of flow rate;near the designed flow rate condition,the radial force reaches the minimum;and at large flow condition,the radial force increases with the flow rate.  
2009 Vol. 27 (4): 205-209 [Abstract] ( 1979 ) [HTML 1KB] [ PDF 295KB] ( 1874 )
210 Measurement on flow field at inlet and outlet of axial-flow pump impeller
Zhang Desheng,Shi Weidong,Guan Xingfan,Cao Weidong,Leng Hongfei
In order to obtain the flow structure in high efficiency axial-flow pump impeller,the measurement device was designed.Five-hole spherical probe was used to measure the velocity at inlet and outlet of axial-flow impeller at the conditions of 0.8Qopt,1.0Qopt and 1.2Qopt.The distributions of velocity vector,static pressure and total pressure were measured.Meridional velocity,circulation and velocity in circumferential direction were analyzed.Measurement results show that the flow in axial-flow pump inlet is steady at the conditions of 0.8Qopt~1.2Qopt,axial velocity decreases gradually from hub to tip,the prerotation is very small,and the static pressure distribution is almost uniform in radial direction at design condition.At optimal condition,there is an almost consistent circulation flow pattern at the outlet of axial-flow impeller without hub leakage.Meridional velocity,circulation,pressure and efficiency all decrease near hub clearance if hub leakage exists.The measured data provides the basis for the further research on flow characters of high-efficiency axial-flow pump.
2009 Vol. 27 (4): 210-214 [Abstract] ( 2049 ) [HTML 1KB] [ PDF 282KB] ( 2223 )
215 Design and experiments of impeller in automatic cleaner for swimming pool
Cao Weidong,Shi Weidong,Wang Min,Li Yue
Based on the theoretic and numerical analyses,the adsorbability power of automatic cleaner was calculated and the necessary flow rate of new impeller is determined.The relation between flow rate and hydraulic losses of the pool cleaner was obtained by experiments and the necessary head of new impeller is achieved.New impeller could equip into former automatic cleaner successfully although the rotating speed is lower than before.The final test results show that new impeller′s power consummation falls about 72% and the motor speed reduces about 42%.The automatic cleaner can attach itself to the wall closely and run calmly,the cost of electric system reduces sharply and the running life prolongs.Although the optimization aims come true,the outflow chamber and pipe should be optimized further.
2009 Vol. 27 (4): 215-219 [Abstract] ( 1283 ) [HTML 1KB] [ PDF 307KB] ( 1698 )
220 Optimization and experimental study of expansion liquid leaking excluder device for submersible pumps
Zhu Rongsheng,Li Jizhong,Liu Mingyuan,Yan Hao,Su Baowen
Considering the problem that the leakage of liquid seriously affects the safety of submersible pumps,an online device to resolve the harm of leakage of liquid to submersible pumps was designed.In order to compare the performance of two kinds of nozzles,expansion and non-expansion,4 different-sized distance of mixing tube to nozzle and 6 different-sized mixing tube diameter were designed.Experiments were done in the same test-bed.The results show that liquid leaking excluder devices with the expansion nozzle have better performance,the best distance of mixing tube to nozzle is 1.67 times the diameter of nozzle throat,and the best diameter is 2 times the diameter of nozzle throat.The liquid leaking excluder device after optimization can solve the problem of fluid leakage better.
2009 Vol. 27 (4): 220-223 [Abstract] ( 1661 ) [HTML 1KB] [ PDF 233KB] ( 1451 )
224 Body structural optimization of rotational flow self-priming pump based on orthogonal design
Wang Chunlin,Liu Hongguang,Si Yanlei,Wu Zhiwang,Yi Tongxiang
Using orthogonal design,optimization design of rotational flow self-priming pump body structural parameter was done through simulation.Orthogonal scheme of four factors and three levels was designed,the influence of geometrical parameters on the characteristics was studied,and optimal scheme of the characteristics was found by analyzing the contrast of performance curves.The influence orders of geometrical parameters to the four characteristics were obtained by using range analysis.The optimization parameter combination was obtained by comprehensive balance analysis and comparison to the data result.For the optimization parameter combination is not in the original design schemes,the redesign was made based on the analyzed result.The performances between the additional scheme and original schemes were contrasted,and the optimal scheme was determined.The results are instructive to the optimization design of rotational flow self-priming pump.
2009 Vol. 27 (4): 224-227 [Abstract] ( 1727 ) [HTML 1KB] [ PDF 224KB] ( 1685 )
228 Derivation and experiments for jet nozzles′ coefficients of self-priming irrigation pump
Li Hong,Shen Zhenhua,Liu Jianrui,Wang Chao,Wang Tao
In order to study the characters of self-priming irrigation pumps′ jet nozzles,fluid mechanics principles were used to derive the resistance coefficients and flow coefficients of self-priming irrigation pump.Four different jet nozzles were designed.By calculating the resistance coefficients and flow coefficients,change laws of coefficients with different outlet diameters were obtained.Four self-priming irrigation pumps with four jet nozzles were tested by the test-bed.Combined with the results of experiments and change laws of coefficients,the influences of resistance coefficients and flow coefficients on self-priming capability were studied.The results show that resistance coefficients decrease and flow coefficient increase with the increasing jet nozzle outlet diameters.At the same time,self-priming time was shortened.But the self-priming capability deteriorates with the weakening of jet entrainment effect in certain extent.  
2009 Vol. 27 (4): 228-231 [Abstract] ( 2074 ) [HTML 1KB] [ PDF 197KB] ( 1421 )
232 Wall attachment frequency of complete fluidic sprinkler′s fluidic element
Xiang Qingjiang,Yuan Shouqi,Li Hong,Liu Junping
 Based on the working principle of complete fluidic sprinkler′s fluidic element and its inner flow state,factors that affect the frequency of wall attachment offset jet are analyzed.A calculating formula of frequency is established by the differential pressures on both sides of fluidic element.The wall fluctuating pressures of fluidic element are measured and converted to the experimental data of wall attachment frequency.The calculating results of frequency agree well with the experimental data.Both the experimental data and the calculating results show that the frequency decreases with the signal pipe length and increases with the fluidic element′s cavity volume.The frequency increases with the sprinkler′s working pressure and the flow rate of signal water.As far as the type of PXH30 sprinkler is concerned,the wall attachment frequencies are linear with the flow rate of signal water.The Reynolds number has little influence on the Strouhal number,and the Strouhal number reduces with the Euler number increasing.The study provides the guide for the design of fluidic element and the adjustment of sprinkler′s working state.
2009 Vol. 27 (4): 232-236 [Abstract] ( 1920 ) [HTML 1KB] [ PDF 305KB] ( 1589 )
237 Experiment of infrared target detection for plants pesticide spraying
Chen Zhigang,Wang Yuguang,Meng Ting,Sun Yingkun
Real plants were detected to study the detection effect and the affecting factors of infrared detecting technology.Different kinds of plants were detected in different environment to study the detecting effect rule by the same method.The results show that plant appearance,light intensity,walking speed and plant space have evident influences on detecting effect,especially plants appearance and light intensity.Plants density and light intensity is proportional both to detection distance and width.Infrared detection technology in plants targeting is more applicable for dense and large target reflectors under strong light intensity.It will get the best detector sensitivity near mid-point of detection distance and give better detection results for plants with high leaf reflectivity.Walking speed of detector has a linear correlation with the minimum distance of individual plant distinguished effectively.Plants space is monotonously correlative to detecting sensitivity.Temperature and humidity have little impact on the detection results.Different plants have different characteristics,but there is almost the same rule applicable.
2009 Vol. 27 (4): 237-241 [Abstract] ( 1645 ) [HTML 1KB] [ PDF 324KB] ( 1627 )
242 Target backside deposition characteristics of air-assisted electrostatic spraying
Wu Chundu,Shi Yanan,Zhang Bo,Jiang Chaofeng
In order to study the atomization characteristics of air-assisted electrostatic spray field and its effect on pesticide target backside deposition,the spraying experiment was carried out by using a tomato fruit with a 80 mm diameter as the spraying target and preparing a Congo red solution with a concentration of 1g/L instead of pesticide.The atomization characteristics was tested and analyzed in various conditions using OLID measurement system.The target backside deposition effect was quantitatively analyzed with the Spectrophotometer.According to the test results,the relationship between atomization characteristics and droplet target backside deposition was analyzed.The experiment indicates that the uncharged droplets can hardly adhere to spraying target backside.Under the influences of aerodynamic force and electrostatic force,the higher the nozzle pressure and charging voltage are,the smaller the droplet diameter is.And its distributions are more symmetrical.The target backside deposition will increase with nozzle pressure and charging voltage,especially with the increasing of charging voltage.The smaller droplet diameter and more symmetrical distributions can improve pesticide target backside deposition effect.  
2009 Vol. 27 (4): 242-246 [Abstract] ( 1957 ) [HTML 1KB] [ PDF 290KB] ( 1752 )
247 Experiment and analysis of performance parameters for refraction nozzle in vent wash exhaust hood
He Hongqin,Yuan Shouqi,Yuan Jianping,Zhang Jie,Liu Xiaofan
In order to reduce the effect of cooking fume pollution on environment,the influence on the cooking fume′s cleaning effect of avent wash exhaust hood by the atomizing characteristic of nozzle was discussed.The experiments of the globoidal sector and the angle including 115°,120°,135°,140°,150° of direct sector refraction nozzle were carried out.Several parameters,i.e.,velocity of flow,range of the nozzle,spray area,size of grain,and water distribution for the six refraction nozzles were measured under five pressures.The atomization performance was analyzed.The relations between these parameters were determined.Through the experiments it was found that the inlet pressure is directly proportional to the velocity of flow,range of the nozzle and spray area.The inlet pressure is inversely proportional to the size of grain.The best working pressure of the vent wash exhaust hood is 0.30 MPa.The cooking fume′s clea-ning effect of direct sector is better than globoidal sector refraction nozzle.The angle of 120°was selected for straight refractive nozzle.Its uniformity coefficient,atomization and spray area are the best.
2009 Vol. 27 (4): 247-250 [Abstract] ( 2055 ) [HTML 1KB] [ PDF 235KB] ( 1661 )
251 Development and application of a new differential pressure flow-meter
Li Yanjun1,Yan Dengfeng2
 A new differential pressure flow-meter is developed by using the theory of flow around a circular cylinder.The special designed cylinder tube is used to obtain fluid pressure in the flow-meter.By measuring the fluid pressure difference between the total pressure hole against the flow and the side hole at specified angles,the point velocities and the average flow rate of cross-section are determined.In a certain range of flow angle around the cylinder tube,the flow pressure coefficient does not change with the Reynolds number,so the new flow-meter can be calibrated outside conduit but not in situ.The application is convenient and reliable,and the system uncertainty can be controlled within ±1.0%.The new flow-meters are applied to the single-pump flow test at the scene of No.1 and No.3 unit of Xietai Pumping Station in South-North Water Transfer East Route Project.The errors between the results of field test and conversion from model test were within 0.78 m3/s.The cylinder tubes of the flow-meters were inserted into the suction chamber before the pump impeller,and the flow measurement of large pump was achieved on the condition of no straight pipes.
2009 Vol. 27 (4): 251-254 [Abstract] ( 1861 ) [HTML 1KB] [ PDF 244KB] ( 1579 )
255 Numerical analysis of cooling process in two-phase flow by low pressure atomization in semi-outdoor environment
Wang Junfeng,Tu Xincheng,Huang Qiaomei,Huang Jiwei
In order to improve the comfort of semi-outdoor environment in summer,the cooling in two-phase flow by low pressure atomization is presented.It is an energy efficient and environmentally benign technology.The cooling process is simulated by using CFD code FLUENT.According to the climate condition in the semi-outdoor environment,the simulations are conducted for different cooling effect,each with droplet diameters of 20 micrometers and 40 micrometers.According to the character of human activity in semi-outdoor environment,the pilot analyses of the cooling effect are made.The results revealed that the evident cooling effect of two-phase flow by low pressure atomization in semi-outdoor environment could be achieved.In the perception zone of human body,the evident cooling effect is made;the cooling up to 3.5 centigrade is attained in the numerical simulation.The relative humidity in local environment does not increase evidently during the cooling process in two-phase flow by low pressure atomization,human body will not sense the dampness and swelter.All of these two types of fine water mists could evaporate,the areas of cooling and humidifier are almost the same.
2009 Vol. 27 (4): 255-260 [Abstract] ( 1812 ) [HTML 1KB] [ PDF 389KB] ( 1769 )
261 Experiment on performance of new type ejecting heater
Cai Qin,Tong Mingwei,Shen Bin,Bai Xiujuan
A new type of multi-nozzle ejecting heater is proposed.The heating device consists of four water nozzles,steam inhalation room,four mixed spouts and diffuse spouts.Ejecting and heating performance of the heater at low steam pressure was studied through the experimental method.The working fluid was 9 ℃ water,and the ejecting fluid was 118～124 ℃steam.The inlet water pressure was changed from 0.1 MPa to 0.45 MPa.The results show that ejecting coefficient and the outlet water temperature decreases while the inlet water pressure rises.Ejecting coefficient decreases while the distance between water nozzle and mixed spout increases.The outlet water temperature increases while steam pressure rises.The temperature can rise by 85 ℃.Heating efficiency of the ejector can reach 99% when the distance between water nozzle and mixed spout is 38 mm.The ejector can operate safely and reliably in low pressure heating system.The risk of high pressure water flowing into low pressure extraction pipe can be eliminated in the confined room by directly mixed heating method.
2009 Vol. 27 (4): 261-264 [Abstract] ( 1644 ) [HTML 1KB] [ PDF 247KB] ( 1698 )
265 Extraction of PAHs in pump rubber seals
Wang Yang,Wang Caihong
 The samples collected from the pump rubber seals were extracted by Soxhlet Extraction Method and Ultrasonic Extraction Method respectively.PAHs were separated from the impurities in the pump rubber seals.The extracted liquids were determined by gas chromatography-mass spectrometry.The impact on the concentration,recovery and distribution of PAHs extracted by different extracting methods from pump rubber seals were studied.It was found that the PAHs categories were the same by the two extraction methods,but the Soxhlet Extraction was better than the Ultrasonic Extraction in PAHs quantities,PAHs recoveries and PAHs mass numbers in different polarity and solubility.The results indicated that the ability of Soxhlet extraction method was better than that of ultrasonic extraction method under the GC-MS analytic conditions.However,the Ultrasonic Extraction had special advantage in extracting the high boiling point compounds.Therefore,the sample pretreatment techniques were determined by the compounds character and the different samples complexion.
2009 Vol. 27 (4): 265-268 [Abstract] ( 1372 ) [HTML 1KB] [ PDF 235KB] ( 1480 )
269 Research progress of cavitation and erosion in hydraulic machinery
Yuan Danqing,Chen Xiangyang,Bai Bin,Cong Xiaoqing
The research progress for the mechanism of cavitation in hydraulic machinery,numerical simulation and experiment are summarized.The relationships among the three investigation methods are discussed and the focus are the cavitation model theory and visual experiment.At last,the development trends of cavitation are summarized as the indepth improvement of numerical simulation,the applications of visual technology,and the development of online monitoring system.And the mechanism of cavitation and erosion will be the key emphasis of study in the future.
2009 Vol. 27 (4): 269-272 [Abstract] ( 3365 ) [HTML 1KB] [ PDF 261KB] ( 2774 )
排灌机械工程学报
　

WeChat QR code
　

News

 　
· Call for paper of The 14th Asian International Conference on Fluid Machinery(AICFM14)
· Call for paper of the 2nd International Symposium of Cavitation and Multiphase Flow (ISCM 2016)
· JDIME have be selected for the 2015-2016 China Science Citation Database (CSCD)
· CALL FOR PAPERS and 2nd ANNOUNCEMENT"The 7th International Conference on Pumps and Fans(ICPF2015)"
· The journal won the first prize of "excellent China sciencepaper online journal" again
· WeChat is Running
· A New Column “Irrigation and Drainage Equipment Manufacturing Technology”Setting Up
· CALL FOR PAPERS “8th INTERNATIONAL SYMPOSIUM ON PUMPING MACHINERY”
　　　　　　　　        　　More 
　

WeChat QR code

主管单位
 江苏省教育厅
主办单位
 江苏大学
协办单位
 中国农业机械学会排灌机械分会
 国家水泵及系统工程技术研究中心
 中国农业工程学会农业水土工程专业委员会
主　　编
 袁寿其
编辑出版
 《排灌机械工程学报》编辑部
责任编辑
徐云峰  张文涛 陈建华
谈国鹏  朱漪云 盛    杰
　

Links

 　
· KSB
· National Research Center of Pumps
　　　　　　　　        　　More 
 

Copyright © 2011 Journal of Drainage and Irrigation Machinery Engineering
Support by Beijing Magtech Co.Ltd   E-mail: support@magtech.com.cn