2016
Yang, Jun; Yuan, Shouqi; Pavesi, Giorgio; Li, Chun; Ye, Zhou; Shouqi, Yuan
Study of Hump Instability Phenomena in Pump Turbine at Large Partial Flow Conditions on Pump Mode Journal Article
In: Journal of Mechanical Engineering, vol. 52, iss. 24, pp. 170, 2016, ISSN: 0577-6686.
Abstract | Links | BibTeX | Tags: Francis-type Reversible Turbine, Hump instability, large partial flow conditions, Pump, Pump, Pump as Turbine, Pump Mode, unsteady flow pattern
@article{Yang2016,
title = {Study of Hump Instability Phenomena in Pump Turbine at Large Partial Flow Conditions on Pump Mode},
author = {Jun Yang and Shouqi Yuan and Giorgio Pavesi and Chun Li and Zhou Ye and Yuan Shouqi},
url = {http://www.cjmenet.com.cn/Jwk_jxgcxb/CN/10.3901/JME.2016.24.170},
doi = {10.3901/JME.2016.24.170},
issn = {0577-6686},
year = {2016},
date = {2016-01-01},
urldate = {2016-01-01},
journal = {Journal of Mechanical Engineering},
volume = {52},
issue = {24},
pages = {170},
abstract = {For middle- and high-specific speed pump turbines, the hump instability appearing at large partial flow conditions seriously restricts its stable operation range. These phenomena relate closely to the inner unsteady flow in pump turbine. We investigate the characterization of pressure fluctuation and the mechanism of unsteady flow by an experimental and numerical study of the unsteady flow occurring among the adjustable blades. For pump working at either full or part load conditions, two kinds of periodic pressure pulsations in the diffuser vane have been observed and analyzed. A hump instability appears only when the actual flow rate of head curve is 0.45-0.75 times of the designed value, and our frequency analysis further shows that its appearance is closely related to the two above pressure fluctuations.},
keywords = {Francis-type Reversible Turbine, Hump instability, large partial flow conditions, Pump, Pump, Pump as Turbine, Pump Mode, unsteady flow pattern},
pubstate = {published},
tppubtype = {article}
}
For middle- and high-specific speed pump turbines, the hump instability appearing at large partial flow conditions seriously restricts its stable operation range. These phenomena relate closely to the inner unsteady flow in pump turbine. We investigate the characterization of pressure fluctuation and the mechanism of unsteady flow by an experimental and numerical study of the unsteady flow occurring among the adjustable blades. For pump working at either full or part load conditions, two kinds of periodic pressure pulsations in the diffuser vane have been observed and analyzed. A hump instability appears only when the actual flow rate of head curve is 0.45-0.75 times of the designed value, and our frequency analysis further shows that its appearance is closely related to the two above pressure fluctuations.
