摘要
国内外很多水电站的机组测试中都发现低负荷区存在接近转频的强压力脉动带,机组在该区域运行时往往脉动强度严重超标。该文依据多个工程的原型观测数据,对这种类转频强水压脉动现象进行深入探讨。分析此类现象所具有的特征及其相关影响因素,并应用计算流体动力学模拟,发现在强水压脉动发生时尾水管内的水体存在回流,其脉动的传播及发展与引水系统自身长度密切相关,建议在今后的电站设计与运行中加以考虑,使机组产生的振源频率尽可能避开引水系统内水体的自振频率。
A large number tests of hydropower units experience strong pressure fluctuations at approximately the rotational frequency at small loads. The characteristics of this phenomenon were investigated numerically. The analyses show that strong pressure fluctuations cause back flow in the draft tube, and the propagation of theses fluctuations is closely related to the length of the water distribution system. Thus, the length of the water distribution system should be taken into account so that the natural frequency of the water distribution system is not similar to the frequencies of sources in the hydropower turbine design.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第2期215-218,223,共5页
Journal of Tsinghua University(Science and Technology)
基金
中国博士后科学基金资助项目(023208004)
关键词
水电站
压力脉动
原型观测
计算流体动力学
自振频率
hydropower station
pressure fluctuation
prototype observation
computational fluid dynamics
natural vibration frequency
