变顶高尾水系统小波动过渡过程中水流运动理论研究

 推导了变顶高尾水系统小波动过渡过程水流运动的基本方程，对基本方程进行分析与求解，并以某电站为例，探讨了变顶高尾水系统小波动过渡过程的基本规律。通过小波动过程计算分析结果表明：当水流时间惯性常数 T W0 为某一固定值时，改变坡度 i 值， i 到一定值后对小波动过程稳定性影响甚微，这与试验现象一致；若 i 固定，变化 TW0 ，当 T W0 ≥ 4.5 时，小波动过渡过程为等幅振荡至发散，因此，此值宜小于 4.0 ，这与工程规定相符；当其它水力参数变小时， i 应增大，才能使系统达到良好的动态品质。这些说明所建立的方程组及数学模型是合理的。且此变顶高尾水系统的结构方案能节约较大工程投资

Theoretical Research on Water Flow Movement of Transient Process Caused by Small Fluctuation With Inclined Roof Tailrace Structure

The water flow movement basic equations of transient process caused by small fluctuation in the inclined roof tailrace system were deduced, and then analyzed and calculated. Afterward, the normal and basic laws found from basic data of a real power station were discussed. From the calculation and analysis, some conclusions were drawn as follows. If T_(W0) is fixed, the influence of slope i on the stability is minor when the slope i increases to a certain value during the transient process caused by small fluctuation, this result consists with the test appearances. If i is fixed, when T_(W0) is equal to or greater than (4.5 s), the curve of the fluctuation is a sustained oscillation till to a divergent one, thus T_(W0) is suggested to be small than (4.0), this consists with the specification about T_(W0) in practical engineering. When other parameters such as B,y_0,c_0,H_0 is decreased, the slope i must be increased in order that the dynamic quality of the system can be guaranted. All these above-mentioned prove that the derived equations and mathematic model are right and reasonable. The method is easy to perform and the structure can cut down project investment.