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受调压室与底部主管道衔接方式的影响,水流进出带连接管的阻抗调压室时的流量系数与常规阻抗调压室差别明显。通过对比分析水流进出两种调压室时的局部水头损失系数,确定了带连接管的阻抗调压室的流量系数计算公式,并对水流进出调压室的流态进行了三维数值模拟,对比分析了数值模拟结果和公式计算结果。结果表明,水流进出带连接管的阻抗调压室时水力损失分别由断面突扩、突缩、局部侧收缩和扩大四种类型组成,且连接管内水流无侧向收缩,这使得水流进出此类调压室时流量系数较常规阻抗调压室更大,采用合理的三维流场模拟技术可以有效地确定带连接管的阻抗调压室的水力损失特性。
Influenced by the connection mode between the pressure regulating room and the bottom main pipeline, the flow coefficient when the water flows in and out of the impedance surge chamber with connecting pipe is obviously different from that of the conventional impedance surge chamber. By comparing and analyzing the local head loss coefficient when the water flows in and out of the two pressure regulating chambers, the formula for calculating the flow coefficient of the impedance surge chamber with a connecting pipe is established, and the three-dimensional numerical simulation of the flow pattern of the water flow in and out of the surge chamber is carried out. The numerical simulation results and formula calculation results are analyzed. The results show that the water loss in the pressure surge chamber with connecting pipe is composed of four types of sudden expansion, sudden contraction, partial contraction and expansion, respectively, and no lateral contraction of water flow in the connection pipe, which makes the water flow into and out of such The flow coefficient of the surge tank is larger than that of the conventional surge tank. The reasonable 3D flow field simulation technique can effectively determine the hydraulic loss characteristics of the surge tank with the connecting pipe.