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research-article

Investigation on Flow Characteristics of Pump-Turbine Runners with Large Blade Lean

[+] Author and Article Information
Baoshan Zhu

State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
bszhu@mail.tsinghua.edu.cn

Lei Tan

State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
tanlei@mail.tsinghua.edu.cncurrent

Xuhe Wang

State Grid XinYuan Company Ltd., Beijing 100761, China
wangxuhe1985@163.com

Zhe Ma

State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
youjingyaoxiang@163.com

1Corresponding author.

ASME doi:10.1115/1.4037787 History: Received February 21, 2016; Revised April 18, 2017

Abstract

Frequent changes in the operating modes pose significant challenges in the development of a pump-turbine with high efficiency and stability. In the present paper, two pump-turbine runners, one with a large positive blade lean and another with a large negative lean, are investigated numerically and experimentally. These two runners were designed by using a multiobjective design method. The experimental and the numerical results show that both runner shave good efficiency performances and pressure fluctuations for the runner with a negative blade lean are much lower than those for the runner with a positive blade lean. The internal flow field analyses clarify the effects of the blade lean on the pressure distribution around the runner blades. In the turbine mode at partial load, the negative blade lean can control flow separation in the high pressure side of the runner and then reduce the pressure fluctuations in the vaneless space.

Copyright (c) 2017 by ASME
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