排灌机械工程学报2026，Vol.44Issue(2)：125-132,8.DOI:10.3969/j.issn.1674-8530.24.0119
大水头变幅水泵水轮机水力不稳定性机理及改善方法
Mechanism and improvement methods for hydraulic instability in pump-turbines with large head variation
摘要
Abstract
In order to achieve the goal of″Carbon Peaking and Carbon Neutrality″,and actively promo-ting the development of clean energy,pumped storage technology has been widely used as an important means to maintain the security of the power grid.However,the operation of large head pump turbines may have problems such as vibration and noise caused by the ″S″characteristic zone,so it is important to conduct an in-depth study of the characteristics of the ″S″zone based on numerical calculations.The typical operating conditions of large head pump turbines based on numerical calculations were investi-gated,and the pressure distribution and vortex flow in the ″S″zone were analyzed by steady-state nu-merical calculation method.It is found that when deviating from the design conditions,a water retaining ring will be formed in the bladeless area,which will hinder the water flow into the runner and cause the vortex to block the flow channel.Based on the revealed instability mechanism,a solution is proposed to improve the hydraulic characteristics by optimizing the impeller structure,which success-fully and effectively controls the vortex flow in the flow channel,significantly reduces the flow separa-tion phenomenon,and thus improves the operational stability of the unit.The research results can pro-vide theoretical guidance for the optimization design of pump-turbine with large head variation.关键词
水泵水轮机/"S"区不稳定特性/流动数值模拟/转轮优化/水力特性改善Key words
pump-turbine/″S″zone instability/numerical simulation of flow/runner optimization/improved hydraulic characteristics分类
农业科技引用本文复制引用
陈勇,付晓龙,赵旭泽,李德友,王洪杰..大水头变幅水泵水轮机水力不稳定性机理及改善方法[J].排灌机械工程学报,2026,44(2):125-132,8.基金项目
国家自然科学基金资助项目(52209108,52079034) （52209108,52079034）
四川省科技计划项目(2023YFQ0021) （2023YFQ0021）
黑龙江省自然科学基金联合引导资助项目(HL2023E058) （HL2023E058）
