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| 1 | A Study on the Unsteady Flow Characteristics and Energy Conversion in the Volute of a Pump-as-Turbine Device显示文摘To study the unsteady flow and related energy conversion process in the volute of a pump-as-turbine(PAT)device,six different working conditions have been considered.Through numerical calculation,the spatio-temporal variation of static pressure,dynamic pressure,total pressure and turbulent energy dissipation have been determined in each section of the volute.It is concluded that the reduction of the total power of two adjacent sections of the PAT volute is equal to the sum of the power lost by the fluid while moving from one section to the other and the power output from the two adjacent sections.For a fixed flow rate,the percentage of static pressure energy at the outlet of the PAT is roughly similar to that of the corresponding volute section,and both show a gradually increasing trend.The turbulent dissipation rate on each section of the PAT volute displays a similar a spatio-temporal behavior for different flow rates. | Senchun Miao Hongbiao Zhang Wanglong Tian Yinqiang Li | 2021 | Fluid Dynamics & Materials Processing2021，17，6： | 1 |
| 2 | Investigation on the Changing Characteristics of Flow-Induced Noise in a Centrifugal Pump显示文摘Centrifugal pumps are widely used in engineering for a variety of applications.A known drawback of these devices is the high-level noise generated during operations,which can affect their stability and adversely influence the entire working environment.By combining the Powell vortex sound theory,numerical simulations and experimental measurements,this research explores the trends of variation and the corresponding underlying mechanisms for the flow-induced noise at various locations and under different operating conditions.It is shown that the total sound source intensity(TSSI)and total sound pressure level(TSPL)in the impeller,in the region between the inlet to the outlet and along the circumferential extension of the volute,are much higher than those at pump inlet and outlet.Additionally,under various rotational speeds with the design flow rate(Condition 1),the TSSI and TSPL at pump inlet and outlet are higher than those obtained with the opening of the valve kept unchanged(Condition 2);vice versa when these two parameters are evaluated at various locations in the impeller and the volute under the Condition 2,they exceed the equivalent values obtained for the other Condition 1. | Guanpeng Li Lihui Sun Zhaoyang Wang Chunguo An Chang Guo Shen Cheng Ming Gao | 2021 | Fluid Dynamics & Materials Processing2021，17，5： | 0 |
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