Hydraulic characteristic of pump as turbine with different volute tongue angle in direct and reverse modes

doi:10.19799/j.cnki.2095-4239.2021.0312

Abstract

Abstract:

The volute tongue could markedly influence the performance of pump and turbine. In order to study the hydraulic characteristic of pump as turbine with the variance of volute tongue angle under the direct and reverse modes, a numerical simulation is carried out to analyze the inner flow of low specific speed centrifugal pump with four volute types of different tongue angle, which is validated by experiment. Combining the entropy generation analysis and loss calculation, the change laws of pump head, required head of turbine, efficiency and internal loss are investigated. The results show that an increase of volute tongue angle could improve the pump head, reduce the turbine required head, and make both efficiencies rise, and the efficiency-discharge curves move to the right with the discharge of the best efficiency point increasing, while the pump efficiency decreases when the angle value exceeds a certain range. The loss in the volute region accounts for the major part of hydraulic loss under both modes, and the loss is more likely to be affected by angle changing than it in the runner. As the angle increasing, the pump efficiency rise is attributed to the loss decrease in the outlet region of volute, while the loss reduction in the gap between runner and volute tongue, and the area near volute wall is the main cause instead of the restricted separation in the runner for the improvement of the turbine efficiency.

Key words: pump as turbine, volute tongue angle, direct and reverse modes, entropy generation diagnose, inner flow analysis

CLC Number:

TK 02

Zhiyi YUAN, Yongxue ZHANG, Ziwei QI. Hydraulic characteristic of pump as turbine with different volute tongue angle in direct and reverse modes[J]. Energy Storage Science and Technology, 2021, 10(5): 1777-1787.

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变量	值	变量	值
D₁/mm	50	β₁/(°)	29
D₂/mm	236	β₂/(°)	19.1
f/mm	23.3	t₁/mm	2
r_c/mm	124	t₂/mm	1
φ_b/(°)	230	t₃/mm	4
φ_c/(°)	9	t₄/mm	5

参数	值
网格数(百万)：Ⅰ, Ⅱ, Ⅲ, Ⅳ	2.53, 4.05, 6.48, 7.68
r₂₁	1.6
r₃₂	1.6
H^*₁	0.1480
H^*₂	0.1475
H^*₃	0.1471
H^*₄	0.1470
P^*	0.7151
Φ²¹_ext	19.575
e²¹_a	0.0036
e²¹_ext	0.0089
GCI²¹_fine	0.0112

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