TY - JOUR
T1 - Numerical research of pump-as-turbine performance with synergy analysis
AU - Cao, Zheng
AU - Deng, Jianqiang
AU - Zhao, Linkun
AU - Lu, Lin
N1 - Funding Information:
Funding: This research was funded by the Fundamental Research Funds for the Central Universities (Grant No. xjh012019022), the Natural Science Basic Research Program of Shaanxi Province (Grant No. 2021JQ052), and the National Natural Science Foundation of China (Grant No. 21978227).
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/6/11
Y1 - 2021/6/11
N2 - The wide use of pumps and turbines has significant value in energy conservation and utilization. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model and a one-dimensional theoretical model of a Pump as Turbine (PAT) were established. On this basis, the correlation between pressure and velocity was quantitatively investigated by a proposed sensitivity index (SPV). A synergy field analysis was then applied to evaluate the flow characteristics of a pump and PAT, providing a perspective from the mechanism of the energy transfer enhancement for hydraulic devices. Moreover, the hydraulic and synergy performances of PAT were studied under various operating conditions. The results show that the minimum SPV is obtained in the impeller. With increasing flow rate, the SPV of the PAT generally increases, and the synergy angle of the impeller surface increases as well. A strong disordered synergy field is observed in regions of the blade leading edge, trailing edge, and volute tongue. The variations in efficiency and head with flow rate showed similar trends, respectively, with the synergy angle of the outlet and the mid-plane. This study provides an analytical method for quantitative evaluation of flow synergy characteristics, and it supplies a basis for further design improvement of the pump and PAT.
AB - The wide use of pumps and turbines has significant value in energy conservation and utilization. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model and a one-dimensional theoretical model of a Pump as Turbine (PAT) were established. On this basis, the correlation between pressure and velocity was quantitatively investigated by a proposed sensitivity index (SPV). A synergy field analysis was then applied to evaluate the flow characteristics of a pump and PAT, providing a perspective from the mechanism of the energy transfer enhancement for hydraulic devices. Moreover, the hydraulic and synergy performances of PAT were studied under various operating conditions. The results show that the minimum SPV is obtained in the impeller. With increasing flow rate, the SPV of the PAT generally increases, and the synergy angle of the impeller surface increases as well. A strong disordered synergy field is observed in regions of the blade leading edge, trailing edge, and volute tongue. The variations in efficiency and head with flow rate showed similar trends, respectively, with the synergy angle of the outlet and the mid-plane. This study provides an analytical method for quantitative evaluation of flow synergy characteristics, and it supplies a basis for further design improvement of the pump and PAT.
KW - Centrifugal pump
KW - Hydraulic performance
KW - Pump as turbine
KW - Synergy
UR - http://www.scopus.com/inward/record.url?scp=85108719110&partnerID=8YFLogxK
U2 - 10.3390/pr9061031
DO - 10.3390/pr9061031
M3 - Journal article
AN - SCOPUS:85108719110
SN - 2227-9717
VL - 9
JO - Processes
JF - Processes
IS - 6
M1 - 1031
ER -
