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首先建立了基于特征线法求解带有长进水管的泵系统事故停泵水锤的数学模型 ,其中摩阻项用线性隐式格式近似 ,具有二阶精度 ;采用交错网络进行计算 ,在相同的计算精度下减少了工作量 .通过调整波速来保证进、出水管的计算时间步长一致 .水泵性能曲线用 Suter法进行处理 ,用于计算分析 .然后运用该数学模型结合某水源工程实例计算分析了带有长进水管的泵系统事故停泵水锤的特点 ,即在事故停泵过渡过程中出水管中会由于负水锤压力导致水柱分离现象 ,而进水管中则会出现很大的正水锤压力 .最后结合该工程的运行特点分析得出其合理的水锤防护措施 ,即在距离泵房 50 0 m处的高岗上的出水管上安装双口排气阀 ,同时调节水泵出口缓闭止回阀的关闭规律
First of all, a mathematical model for solving water pump hammer accident in pump system with long water inlet pipe is established based on the characteristic line method. The friction resistance term is approximated by a linear implicit scheme with second-order accuracy. By using the staggered network, Accuracy reduced the workload. By adjusting the wave speed to ensure that the inlet and outlet pipe calculation time step. Pump performance curve Suter method for processing and calculation and analysis. And then use the mathematical model combined with a water source project examples calculated Pump system with a long water inlet to stop the pump system accidental characteristics of water hammer, that is, in the process of the accident pump out of the water pipe will be due to the negative pressure caused by water hammer separation, and the water inlet pipe will appear a large positive water hammer Finally, combining with the operation characteristics of the project, the reasonable water hammer protection measures are obtained, that is, a dual-port exhaust valve is installed on the outlet pipe on the Konggang at a distance of 50 m from the pump house, and the water outlet of the pump is slowly closed Check valve closing law