长距离有压输水工程停泵水锤模拟及防护研究OA

To study the water hammer during pump trip in long-distance pressurized water transmission projects,the characteristic line meth-od was used to numerically simulate actual pressurized water transmission projects.This study analyzed and studied the impact of the absence of water hammer protection measures,the installation of check valve protection measures,and control strategies on water hammer.Based on this,a water hammer protection scheme combining air valve and check valve was proposed,and sensitivity analysis was conducted on the pa-rameters of the air valve.The results indicate that when without water hammer protection measures,pump trip in accidents will result in con-tinuous reversal of the pump and severe negative pressure along the water pipeline;When using two-stage closing check valve protection measures,optimizing the valve closure strategy can improve the maximum pressure of the pipeline and the reversal of the water pump,but the improvement effect on the negative pressure inside the pipeline is not significant;The joint installation of fast forward and slow exhaust air valves can effectively improve the serious negative pressure problem.The diameter of the air valve has a significant impact on the water hammer protection effect,and there is an optimal solution.