双机共用尾水调压室阻力系数试验研究

主要对水流在流入和流出调压室时,其流量比、阻抗孔面积和运行机组数目的变化对调压室阻力系数的影响开展了研究,并对双机共用尾水调压室的物理模型进行了水工试验。试验结果表明,调压室的阻力系数会随着流量比的增大和阻抗孔面积的减小而增大。其中,在分流工况时,双机运行的调压室阻力系数比单机运行的调压室阻力系数要大;在合流工况时,单机运行的调压室阻力系数与双机运行时的相差无几。试验结果可为类似型式的尾水调压室的设计与研究提供借鉴及参考。

Experimental study on damping coefficient of tailrace surge tank shared by two units

The influences of the variation of discharge ratio, impedance hole area and unit number on the damping coefficient of the tailrace surge tank when water flows in and out were researched, and the physical model study of the tailrace surge tank shared by two units was conducted. The results show that the damping coefficient increases with the increment of discharge ratio and the decrease of impedance hole. In the case of flow separation case, the damping coefficient of tailrace surge tank under two units operation is larger than that of single unit; in the case of flow confluence, there is no much difference between the single unit operation and two units operation. The results can provide reference for the design and research of similar tailrace surge tank.