摘要
以国内某抽水蓄能电站为例,选取先增后甩工况作为最高涌浪的控制工况,分别采用解析法和基于特征线的数值仿真法,对比分析了最高涌浪的发生条件及2种方法的差异。结果表明:数值仿真法考虑了导叶启闭规律的影响,相较于采用流量突变模型的解析法,调压室水位波动发生滞后,更准确地模拟了调压室的水位波动过程;导叶启闭规律越长,工况转换越多,则滞后时间越久,但几乎不影响调压室的涌浪极值;2种方法共同验证了先增后甩工况的最不利叠加时刻为初始工况与叠加工况的Z-V曲线相切时刻,相应产生的调压室涌浪最高;数值仿真法由于发生叠加工况时流量为渐变,因而切点的发生时刻在Z-V曲线上产生后移,但2种方法的调压室的涌浪极值十分接近。
Taking a domestic pumped-storage power station as an example,the condition of load increase first and then rejection is selected as the control condition of the highest surge of diversion surge chamber.The analytical method based on the flow catastrophe model and the numerical simulation method based on the characteristic line are used to analyze the occurrence conditions of the highest surge and the differences between the two methods.The results show that,(a)as the numerical simulation method considers the influence of the opening and closing law of the guide vane,compared with the analytical method,the water level fluctuation of the surge chamber lags behind,and the water level fluctuation process is more accurately simulated;(b)the longer the opening and closing times of the guide vane and the more the operating condition changes,the longer the lag time,but it hardly affects the extreme value of surge;(c)the two methods verify that the most unfavorable superposition time of the load increase first and then rejection condition is the time when the Z-V curve of the initial condition is tangent to the superposition condition,and at this moment,the surge is the highest;and(d)because the flow is gradually changing under the superposition condition in the numerical simulation method,the occurrence time of the tangent point moves backward on the Z-V curve,but the surge extreme values of the two methods are very close.
作者
郭建强
罗国虎
王熙
仵杰
米海堂
GUO Jianqiang;LUO Guohu;WANG Xi;WU Jie;MI Haitang(Anhui Jinzhai Pumped Storage Power Station Investment Co.,Ltd.,Lu'an 237000,Anhui,China)
出处
《水力发电》
CAS
2022年第9期67-70,123,共5页
Water Power
关键词
调压室
最高涌浪
最不利叠加时刻
解析法
数值仿真法
抽水蓄能电站
surge chamber
highest surge
most unfavorable superposition time
analytical method
numerical simulation method
pumped-storage power station
