气垫式调压室稳定断面积研究

发布时间：2018-04-09 06:44

本文选题：气垫式调压室　切入点：稳定断面积　出处：《水利学报》2016年05期

【摘要】：基于刚性水锤理论,考虑了压力管道的水流惯性及实际水轮机特性和调速器作用,运用稳定性理论,推导了气垫式调压室临界稳定断面积的详细公式。在此基础上分析最不利稳定断面积的取值,根据近年来国内十个不同水头段引水式水电站的资料,进行该公式各项参数的统计分析。结果表明:气垫式临界稳定断面详细公式主要由考虑水轮机特性的引水隧洞水流惯性项F_(th1)、压力管道项F_(th2)及调速器特性项F_(th3)三部分组成,在形式上与常规调压室一致,区别仅在于(1+m×p_0/l_0)倍的系数关系。气垫式调压室最不利稳定断面积取决于最大水头与设计水头之间的某个既能满足(1+m×p_0/l_0)较大,也能满足e1的水头。随着电站设计水头的增大,系数(1+m×p_0/l_0)的值也呈线性增大趋势,不能笼统地判断气垫式调压室适用于高水头水电站,应根据电站的工程规模作进一步详细论证。
[Abstract]:Based on the rigid water hammer theory, considering the flow inertia of the pressure pipe, the characteristics of the actual turbine and the function of the governor, a detailed formula for the critical stable break area of the air cushion surge chamber is derived by using the stability theory.Based on the analysis of the values of the most unfavorable stable sectional area, the statistical analysis of the parameters of the formula is carried out according to the data of ten different head water diversion hydropower stations in China in recent years.The results show that the detailed formula for critical stable section of air cushion type is mainly composed of three parts: the inertia term of water flow of the diversion tunnel considering the characteristics of the turbine, the inertia term of the water flow, the pressure pipeline term, and the characteristic item of the governor, and the formula is in accordance with the conventional surge chamber, and the formula is composed of three parts, namely, the flow inertia term of the diversion tunnel considering the characteristics of the turbine, the pressure pipe term and the governor characteristic item.The difference lies only in the coefficient relation of 1 m 脳 PSP 0 / l0).The most unfavorable stable sectional area of the air cushion surge chamber depends on the fact that one of the maximum water heads and the design water head can satisfy both the 1 m 脳 p D 0 / L 0) and the E 1 head of water head.With the increase of the design head of the power station, the value of the coefficient of 1 m 脳 P0 / L\ + +\%\%\%\%\%\%\ +\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%
【作者单位】：长江水利委员会长江勘测规划设计研究有限责任公司;武汉大学水资源与水电工程科学国家重点实验室;武汉大学动力与机械学院;
【基金】：国家自然科学基金项目(51379158)
【分类号】：TV732.56

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