空气阀进排气流量系数对停泵水锤的敏感性研究

在长距离供水工程中,空气阀的进排气流量系数反映了空气的流通性和空气阀防护水锤的能力,而通常在对泵站水力过渡过程数值模拟的计算中将进排气流量系数取为定值。为了研究空气阀进排气流量系数对停泵水锤的影响,以某提黄灌溉工程为例,利用Visual Basic水锤计算软件模拟分析不同进排气流量系数组合下的停泵水锤值。结果表明,空气阀的进气流量系数越大,正压和负压绝对值越小,空气阀防护水锤的效果越好;排气流量系数太大或太小时,正压增大,适当偏小时水锤防护效果较好。

Sensitivity Study of Inlet and Exhaust Flow Coefficient of Air Valve for Pump Water Hammer

In long distance water supply project, the inlet and exhaust flow coefficient of air valve reflects the liquidity and the ability of water hammer protection of air valve, and usually the inlet and exhaust flow coefficient is taken as a fixed value in the numerical simulation of hydraulic transients in pumping stations. In order to study the influence of inlet and exhaust flow coefficient of air valve on pump water hammer, taking an irrigation project of the Yellow River as an example, Visual Basic water hammer calculation software was used to simulate the pump water hammer value under different combination of inlet and exhaust flow coefficient. The results show that the larger the inlet flow coefficient of air valve is, the smaller the absolute value of positive pressure and negative pressure is, the better protective effect of air valve against water hammer is. When the exhaust flow coefficient is too large or too small, the positive pressure increases, the protective effect of water hammer is better for small positive pressure.