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| 1 | Numerical investigation on the “S” characteristics of a reduced pump turbine model显示文摘The performance of a reversible pump turbine with S-shaped characteristics is of great importance to the transition processes such as start-up and load rejection. In order to predict the S-shaped curve accurately and develop a reliable tool for design improvement, a shear stress transport model (SST) with various numerical schemes for pressure term in the governing equation was investigated in a whole pump turbine including spiral casing, stay vanes, guide vanes, runner and draft tube. Through the computation, it was shown that different zones in the curve should employ different schemes to get the solution converged. Comparison of discharge-speed performance showed that good correspondence is got between experimental data and CFD results. Based on this, internal flow analysis was carried out at three typical operating points representing turbine mode, shut-off mode and reversible pump mode, respectively. According to the flow field concerned, the mechanism for the speed-no-load instability was explained, which provides good guidelines to take countermeasures in future design. | WANG LeQin YIN JunLian JIAO Lei WU DaZhuan QIN DaQing | 2011 | Science China(Technological Sciences)2011，54，5： | 20 |
| 2 | Investigation of CFD Calculation Method of a Centrifugal Pump with Unshrouded Impeller显示文摘Currently, relatively large errors are found in numerical results in some low-specific-speed centrifugal pumps with unshrouded impeller because the effect of clearances and holes are not accurately modeled. Establishing an accurate analytical model to improve performance prediction accuracy is therefore necessary. In this paper, a three-dimensional numerical simulation is conducted to predict the performance of a low-specific-speed centrifugal pump, and the modeling, numerical scheme, and turbulent selection methods are discussed. The pump performance is tested in a model pump test bench, and flow rate, head, power and efficiency of the pump are obtained. The effect of taking into consideration the back-out vane passage, clearance, and balance holes is analyzed by comparing it with experimental results, and the performance prediction methods are validated by experiments. The analysis results show that the pump performance can be accurately predicted by the improved method. Ignoring the back-out vane passage in the calculation model of unshrouded impeller is found to generate better numerical results. Further, the calculation model with the clearances and balance holes can obviously enhance the numerical accuracy. The application of disconnect interface can reduce meshing difficulty but increase the calculation error at the off-design operating point at the same time. Compared with the standard k–ε, renormalization group k–ε, and Spalart–Allmars models, the Realizable k–ε model demonstrates the fastest convergent speed and the highest precision for the unshrouded impeller flow simulation. The proposed modeling and numerical simulation methods can improve the performance prediction accuracy of the low-specific-speed centrifugal pumps, and the modeling method is especially suitable for the centrifugal pump with unshrouded impeller. | WU Dazhuan YANG Shuai XU Binjie LIU Qiaoling WU Peng WANG Leqin | 2014 | Chinese Journal of Mechanical Engineering2014，27，2： | 7 |
| 3 | Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump显示文摘Double-suction centrifugal pumps have been applied extensively in many areas,and the significance of pressure fluctuations inside these pumps with large power is becoming increasingly important.In this study,a double-suction centrifugal pump with a high-demand for vibration and noise was redesigned by increasing the flow uniformity at the impeller discharge,implemented by combinations of more than two parameters.First,increasing the number of the impeller blades was intended to enhance the bounding effect that the blades imposed on the fluid.Subsequently,increasing the radial gap between the impeller and volute was applied to reduce the rotor-stator interaction.Finally,the staggered arrangement was optimized to weaken the efficacy of the interference superposition.Based on numerical simulation,the steady and unsteady characteristics of the pump models were calculated.From the fluctuation analysis in the frequency domain,the dimensionless pressure fluctuation amplitude at the blade passing frequency and its harmonics,located on the monitoring points in the redesigned pumps(both with larger radial gap),are reduced a lot.Further,in the volute of the model with new impellers staggered at 12°,the average value for the dimensionless pressure fluctuation amplitude decreases to 6%of that in prototype pump.The dimensionless rootmean-square pressure contour on the mid-span of the impeller tends to be more uniform in the redesigned models(both with larger radial gap);similarly,the pressure contour on the mid-section of the volute presents good uniformity in these models,which in turn demonstrating a reduction in the pressure fluctuation intensity.The results reveal the mechanism of pressure fluctuation reduction in a double-suction centrifugal pump,and the results of this study could provide a reference for pressure fluctuation reduction and vibration performance reinforcement of doublesuction centrifugal pumps and other pumps. | Qianqian Li Shiyang Li Peng Wu Bin Huang Dazhuan Wu | 2021 | Chinese Journal of Mechanical Engineering2021，34，1： | 2 |
| 4 | Experimental study on hydrodynamic performance of a cavitating centrifugal pump during transient operation显示文摘 | Wu Dazhuan Wang Leqin Hao Zongrui | 2010 | Journal of Mechanical Science and Technology2010，24，2： | 1 |
| 5 | Experi- mental study on hydrodynamic performance of a cavita- ting centrifugal pump during transient operation 显示文摘 | WU Dazhuan WANG Leqin HAO Zongrui | 2010 | Journal of mechanical science and technology2010，24，2： | 1 |
| 6 | Ex- perimental Study on Hydrodynamic Performance of a Cavitating Centrifugal Pump During Transient Operation 显示文摘 | WU Dazhuan WANG Leqin HAO Zongrui | 2010 | Journal of Mechanical Science and Technology2010，24，2： | 1 |
| 7 | Numerical Simulation of the Transient Flow in a Centrifugal Pump During Startup Period 显示文摘 | LI Zhifeng WU Dazhuan WANG Leqin | 2010 | ASME Journal of Fluids Engi- neering2010，132，08： | 1 |
| 8 | Experimental study on hydrodynamic performance of a cavitating centrifugal pump during transient operation 显示文摘 | Wu Dazhuan Wang Leqin Hao Zongrui | 2010 | Journal of Mechanical Science and Technology2010，24，2： | 1 |
| 9 | Numerical simulation of the transient flow in a centrifugal pump during startup period显示文摘 | LI Zhifeng WU Dazhuan WANG Leqin | 2010 | ASME Journal of Fluids Engineering2010，132，08： | 1 |
| 10 | Numerical simulation of the transient flow in a centrifugal pump during starting period显示文摘 | LI Zhifeng WU Dazhuan WANG Leqin | 2010 | ASME Jottmal of Fluids Engineering2010，132，08： | 1 |
| 11 | Experimental study on hydrodynamic performance of a cavitating centrifugal pump during transient operation显示文摘 | WU Dazhuan WANG Leqin HAO Zongrui | 2010 | Journal of Mechanical Science and Technology2010，24，2： | 1 |
| 12 | Experimental and numerical study of transient flow in a centrifugal pump during startup显示文摘 | Li Zhifeng Wu Peng Wu Dazhuan | 2011 | Journal of Mechanical Science and Technology2011，25，3： | 1 |
| 13 | CFD simulation of flow-pressure characteristics of a pressure control valve for au- tomotive fuel supply system显示文摘 | WU Dazhuan LI Shiyang WU Peng | 2015 | Energy conversion and man agement2015，10，： | 1 |
| 14 | The transient flow in a centrifugal pump during the discharge valve rapid opening process 显示文摘 | Wu Dazhuan Wu Peng Li Zhifeng | 2010 | Nuclear Engineering and Design2010，240，： | 1 |
| 15 | Numerical simulation of the transient flow in a centrifugal pump during starting period显示文摘 | Li Zhifeng Wu Dazhuan Wang Leqin | 2010 | Journal of Fluids Engineering2010，132，8： | 1 |
| 16 | Transient characterisitcs of a close-loop pipe system during pump stopping periods显示文摘 | Wu Dazhuan Wu Peng Yang Shuai | 2014 | Journal of Pressure Vessel Technology2014，136，2： | 1 |
| 17 | Investigation of the mechanism of low-density particle and liquid mixing process in a stirred vessel显示文摘 | CHEN Tao WANG Leqin WU Dazhuan | 2012 | The Canadian Journal of Chemical Engineering2012，90，4： | 1 |
| 18 | The transient flow in a centrifugal pump during the discharge valve rapid opening process显示文摘 | Wu Dazhuan Wu Peng Li Zhifeng | 2010 | Nuclear Engineering and Design2010，240，12： | 1 |
| 19 | Investigation of the mechanism of low-density particle and liquid mixing process in a stirred vessel 显示文摘 | CHEN Tao WANG Leqin WU Dazhuan | 2012 | The Canadian Journal of Chemical Engineering2012，90，4： | 1 |
| 20 | Experimentaland numerical study of transient flow in a centrifugal pump during startup显示文摘 | Li Zhifeng Peng Wu Dazhuan | 2011 | Journal of Mechanical Science and Technology2011，25，3： | 1 |
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