尾水管导流栅的减振性能分析

Analysis on damping performance of diversion barrier for draft tube

针对尾水涡带的偏心运动对涡带压力脉动形成的影响,通过理论分析,推导了压力脉动力与涡带偏心距之间的关系表达式,同时对某实际模型在安装导流栅前后分别进行了全流道的三维湍流数值模拟,综合比较理论与模拟数据。结果表明,通过安装导流栅能起到限制涡带偏心运动的作用,从而达到降低压力脉动的效果。

Aiming at the impact from the eccentric movement of tail water vortex zone on the formation of pressure fluctuation, the formula of the relationship between the pressure fluctuation and the eccentric distance of the vortex zone is derived herein, while the 3 - D turbulence numerical simulations are respectively made on an actual model before and after installing the diversion barrier, and then the theoretical and simulated data are comprehensively compared as well. It is indicated that the installation of the diversion barrier can play the role of restricting the effect of the vortex zone eccentric movement, thus get the effect to lower the pressure fluctuation.