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| 1 | Effects of Blade Number on Characteristics of Centrifugal Pumps显示文摘The blade number of impeller is an important design parameter of pumps,which affects the characteristics of pump heavily.At present,the investigation focuses mostly on the performance characteristics of axis flow pumps,the influence of blade number on inner flow filed and characteristics of centrifugal pump has not been understood completely.Therefore,the methods of numerical simulation and experimental verification are used to investigate the effects of blade number on flow field and characteristics of a centrifugal pump.The model pump has a design specific speed of 92.7 and an impeller with 5 blades.The blade number is varied to 4,6,7 with the casing and other geometric parameters keep constant.The inner flow fields and characteristics of the centrifugal pumps with different blade number are simulated and predicted in non-cavitation and cavitation conditions by using commercial code FLUENT.The impellers with different blade number are made by using rapid prototyping,and their characteristics are tested in an open loop.The comparison between prediction values and experimental results indicates that the prediction results are satisfied.The maximum discrepancy of prediction results for head,efficiency and required net positive suction head are 4.83%,3.9% and 0.36 m,respectively.The flow analysis displays that blade number change has an important effect on the area of low pressure region behind the blade inlet and jet-wake structure in impellers.With the increase of blade number,the head of the model pumps increases too,the variable regulation of efficiency and cavitation characteristics are complicated,but there are optimum values of blade number for each one.The research results are helpful for hydraulic design of centrifugal pump. | LIU Houlin WANG Yong YUAN Shouqi TAN Minggao WANG Kai | 2010 | Chinese Journal of Mechanical Engineering2010，23，6： | 28 |
| 2 | Numerical Research on Performance Prediction for Centrifugal Pumps显示文摘Performance prediction for centrifugal pumps is now mainly based on numerical calculation and most of the studies merely focus on one model. Therefore, the research results are not representative. To make an improvement of numerical calculation method and performance prediction for centrifugal pumps, performance of six centrifugal pump models at design flow rate and off design flow rates, whose specific speed are different, were simulated by using commercial code FLUENT. The standard k-ε turbulence model and SIMPLEC algorithm were chosen in FLUENT. The simulation was steady and moving reference frame was used to consider the impeller-volute interaction. Also, how to dispose the gap between impeller and volute was presented and the effect of grid number was considered. The characteristic prediction model for centrifugal pumps is established according to the simulation results. The head and efficiency of the six models at different flow rates are predicted and the prediction results are compared with the experiment results in detail. The comparison indicates that the precision of head and efficiency prediction are all less than 5%. The flow analysis indicates that flow change has an important effect on the location and area of low pressure region behind the blade inlet and the direction of velocity at impeller inlet. The study shows that using FLUENT simulation results to predict performance of centrifugal pumps is feasible and accurate. The method can be applied in engineering practice. | TAN Minggao YUAN Shouqi LIU Houlin WANG Yong WANG Kai | 2010 | Chinese Journal of Mechanical Engineering2010，23，1： | 15 |
| 3 | Experimental investigation of the unsteady flow in a double-blade centrifugal pump impeller显示文摘Particle Image Velocimetry (PIV) technology was used to study the unsteady internal flow in a double-blade centrifugal pump (DBCP) impeller at the design flow rate.Relative velocity distributions and turbulence intensity distributions in the DBCP impeller at six phase conditions were obtained.And mean dimensionless relative velocity,turbulence intensity,mean absolute flow angle,mean relative flow angle,mean dynamic pressure and mean angular momentum distributions at the different radii of impeller were calculated.Results show that from impeller inlet to impeller outlet,turbulence intensities gradually decrease.With the increase of radius r,mean dimensionless relative velocity first decreases and then increases,while variation tendencies of mean absolute flow angle and mean dynamic pressure are the opposite.With the increase of radius r,turbulence intensity and mean relative flow angle first decrease,then increase,and then decrease,while mean angular momentum gradually increases. | LIU HouLin WANG Kai KIM Hyoung-Bum TAN MingGao | 2013 | Science China(Technological Sciences)2013，56，4： | 8 |
| 4 | 3D Particle Image Velocimetry Test of Inner Flow in a Double Blade Pump Impeller显示文摘The double blade pump is widely used in sewage treatment industry,however,the research on the internal flow characteristics of the double blade pump with particle image velocimetry(PIV) technology is very little at present.To reveal inner flow characteristics in double blade pump impeller under off-design and design conditions,inner flows in a double blade pump impeller,whose specific speed is 111,are measured under the five off-design conditions and design condition by using 3D PIV test technology.In order to ensure the accuracy of the 3D PIV test,the external trigger synchronization system which makes use of fiber optic and equivalent calibration method are applied.The 3D PIV relative velocity synthesis procedure is compiled by using Visual C++ 2005.Then absolute velocity distribution and relative velocity distribution in the double blade pump impeller are obtained.Test results show that vortex exists in each condition,but the location,size and velocity of vortex core are different.Average absolute velocity value of impeller outlet increases at first,then decreases,and then increases again with increase of flow rate.Again average relative velocity values under 0.4,0.8,and 1.2 design condition are higher than that under 1.0 design condition,while under 0.6 and 1.4 design condition it is lower.Under low flow rate conditions,radial vectors of absolute velocities at impeller outlet and blade inlet near the pump shaft decrease with increase of flow rate,while that of relative velocities at the suction side near the pump shaft decreases.Radial vectors of absolute velocities and relative velocities change slightly under the two large flow rate conditions.The research results can be applied to instruct the hydraulic optimization design of double blade pumps. | LIU Houlin WANG Kai YUAN Shouqi TAN Minggao WANG Yong RU Weimin | 2012 | Chinese Journal of Mechanical Engineering2012，25，3： | 5 |
| 5 | Study on Unstable Characteristics of Centrifugal Pump under Different Cavitation Stages显示文摘In order to reveal the regularity of unsteady flow of centrifugal pump under different cavitation stages,a visual closed test-bed is built to collect signals such as the distribution of cavitation bubbles at the impeller inlet and external characteristics,etc.in the process of cavitation of centrifugal pumps.Combined with the shape and distribution of bubbles captured by high-speed photography,the cavitation stage of the centrifugal pump is divided.In addition,the variation of vorticity distribution,pressure pulsation and radial force of centrifugal pump under different cavitation stages are studied using the standard κ-ε turbulence model and the Kunz cavitation model.Main contributions are as follows:The cavitation bubbles can absorb the energy of vortex core to a certain extent and increase the volume of vortex core.Cavitation bubbles can also block the flow-path and induce the distortion of the internal flow field,resulting in unstable pressure waves that cause a significant increase in pressure pulsation rate.Besides,with the development of cavitation,the radial force on the impeller tends to remain invariable first and then decrease,and trajectory of the radial force changes from closed to open. | DONG Liang SHANG Huanhuan ZHAO Yuqi LIU Houlin DAI Cui WANG Ying | 2019 | Journal of Thermal Science2019，28，4： | 4 |
| 6 | Study on Drag and Noise Reduction of Bionic Blade of Centrifugal Pump and Mechanism显示文摘In order to study the relationship between the important parameters of internal flow and the effect of drag and noise reduction,the internal flow field and sound field characteristics of bionic centrifugal pump are studied in this paper.Based on the methods of theoretical analysis,numerical simulation and test,the relationship between wall average shear stress,drag reduction rate,increasing efficiency and noise reduction rate of internal sound field is studied.Internal flow parameters to judge and predict the effect of drag and noise reduction are revealed.The results show that the bionic pit can effectively increase the thickness of the boundary layer and reduce the Reynolds stress on the wall.The resistance on the wall is reduced and the hydraulic efficiency of the centrifugal pump is increased.The noise reduction rate is basically consistent with the changing trend of the drag reduction rate,increasing efficiency and wall average shear stress in the flow field.Wall average shear stress can reveal the effect of drag and noise reduction,so the effect of drag and noise reduction can be predicted and judged by the change of wall average shear stress. | Cui Dai Chao Guo Zhipeng Ge Houlin Liu Liang Dong | 2021 | Journal of Bionic Engineering2021，18，2： | 3 |
| 7 | Effects of the Radial Gap between Impeller Tips and Volute Tongue Influencing the Performance and Pressure Pulsations of Pump as Turbine显示文摘 | Yang Sunsheng Liu Houlin Kong Fanyu | 2014 | Journal of Fluids Engine ering2014，136，5： | 1 |
| 8 | Experimental, Numerical, and Theoretical Research on Impeller Diameter Influencing Centrifugal Pump - as - turbine 显示文摘 | Yang Sunsheng Liu Houlin Kong Fanyu | 2013 | Journal of Energy Engineering2013，139，4： | 1 |
| 9 | Multicondition optimization and experimental measurements of a double-blade centrifugal pump impeller显示文摘 | Liu Houlin Wang Kai Yuan Shouqi | 2013 | Journal of Fluids Engineering2013，135，11： | 1 |
| 10 | ComputationandexperimentforaxialforcebalabeingofcannedmotorpumpPBN65-40-250[J]显示文摘 | Kong Fanyu Gao Cuilan Zhang Xufeng Zhang Hongli Liu Houlin | | 农业学报0，，： | 1 |
| 11 | Effects of the radial gap between impeller tips and volute tongue influencing the performance and pressure pulsations of pump as turbine显示文摘 | Yang Sunsheng Liu Houlin Kong Fanyu | 2014 | Journal of Fluids Engineering2014，136，54： | 1 |
| 12 | Experimental, numerical and theoretical research on impeller diameter influencing centrifugal pump-as-turbine显示文摘 | Yang Sunsheng Liu Houlin Kong Fanyu | 2013 | ASCE Journal of Energy Engineering2013，139，4： | 1 |
| 13 | Effects of the radial gap between impeller tips and volute tongue influencing the performance and pressure pulsations of pump as turbine显示文摘 | Yang Sunsheng Liu Houlin Kong Fanyu | 2014 | Journal of Fluids Engineering2014，136，5： | 1 |
| 14 | Analysis of Knowledge Level and Use of Antiretroviral Pre-Exposure and Post-Exposure Prophylaxis Among MSM—China,2019–2022显示文摘Summary What is already known on this topic?Men who have sex with men(MSM)in China have a high rate of human immunodeficiency virus(HIV)infection.Pre-exposure prophylaxis(PrEP)and postexposure prophylaxis(PEP)have been shown to be effective in preventing HIV,which may help to contain the HIV epidemic among MSM.What is added by this report?This study found that knowledge and usage of PrEP were low among MSM,indicating that this population is at high risk for HIV infection.Promotion of PrEP and PEP among MSM is necessary to reduce the risk of HIV infection in this population.What are the implications for public health practice?PrEP and PEP are novel HIV prevention strategies that have been demonstrated to be effective and safe.To further reduce HIV transmission among MSM in China,it is necessary to promote the use of PrEP and PEP. | Jiahuan Guo Wenting Kang Tongtong Liu Jie Xu Houlin Tang Fan Lyu Guang Zhang | 2023 | China CDC weekly2023，5，13： | 0 |
| 15 | Countermeasure against blinding attack for single-photon detectors in quantum key distribution显示文摘Quantum key distribution(QKD),rooted in quantum mechanics,offers information-theoretic security.However,practi-cal systems open security threats due to imperfections,notably bright-light blinding attacks targeting single-photon detectors.Here,we propose a concise,robust defense strategy for protecting single-photon detectors in QKD systems against blinding attacks.Our strategy uses a dual approach:detecting the bias current of the avalanche photodiode(APD)to defend against con-tinuous-wave blinding attacks,and monitoring the avalanche amplitude to protect against pulsed blinding attacks.By integrat-ing these two branches,the proposed solution effectively identifies and mitigates a wide range of bright light injection attempts,significantly enhancing the resilience of QKD systems against various bright-light blinding attacks.This method forti-fies the safeguards of quantum communications and offers a crucial contribution to the field of quantum information security. | Lianjun Jiang Dongdong Li Yuqiang Fang Meisheng Zhao Ming Liu Zhilin Xie Yukang Zhao Yanlin Tang Wei Jiang Houlin Fang Rui Ma Lei Cheng Weifeng Yang Songtao Han Shibiao Tang | 2024 | Journal of Semiconductors2024，45，4： | 0 |
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