TY - EJOU
AU - Miao, Senchun
AU - Zhang, Hongbiao
AU - Tian, Wanglong
AU - Li, Yinqiang
TI - A Study on the Unsteady Flow Characteristics and Energy Conversion in the Volute of a Pump-as-Turbine Device
T2 - Fluid Dynamics \& Materials Processing
PY - 2021
VL - 17
IS - 6
SN - 1555-2578
AB - 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.
KW - Pump as turbine; volute; energy conversion; unsteady; numerical simulation
DO - 10.32604/fdmp.2021.016925