Stabilisation of the swirl exiting a Francis runner far from the best efficiency point

Author:

Susan-Resiga R F,Muntean S,Bosioc A,Stuparu A

Abstract

Abstract The decelerated swirling flow in the discharge cone of Francis turbines operated at partial discharge, far from the best efficiency point, develops self-induced instabilities featuring a precessing helical vortex (so-called vortex rope) which hinders the stable and safe turbine operation. This is an intrinsic characteristic of the swirl exiting the Francis runner, which at part load has a relatively large residual flux of moment of momentum as well as an imbalanced specific hydraulic energy with an excess near the band. We address in this paper the question of how one should alter this swirling flow in order to mitigate further instabilities in the discharge cone. In doing so, we consider an actuator disk located in the upstream part of the discharge cone that model a runaway runner which alter the hub-to-shroud angular momentum and specific head distributions without altering the turbine operating point. However, such a runaway runner provides a swirl stabilisation further downstream thereby effectively mitigating the vortex rope.

Publisher

IOP Publishing

Subject

General Engineering

Reference12 articles.

1. A review on remedial attempts to counteract the power generation compromise from draft tubes of hydropower plants;Muhirwa;Renewable Energy,2020

2. Jet Control of the Draft Tube Vortex Rope in Francis Turbines at Partial Discharge;Susan-Resiga,2006

3. Optimal Control of Part Load Vortex Rope in Francis Turbines;Pasche;J. Fluids Eng.,2019

4. A variational model for swirling flow states with stagnant region;Susan-Resiga;Eur. J. Mechanics B/Fluids,2016

5. Vortex Breakdown in Decelerated Swirling Flows;Ardelean,2019

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3