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在气液混输管线中常发生流量变化引发的瞬态过程 ,在大型多相流实验环道上进行了流量变化的瞬态实验 .气量突增产生压力过增量 ,它的产生与流型有关 :分层流的过增量是由于气体的惯性 ;在气团流和段塞流下则是由于气体压缩性和液体惯性的联合作用 .气量突降时 ,膨胀波沿程传播 .气量变化的瞬态过程可能出现对应准稳态变化没有出现的流型 .与气量突变相比 ,液量突变引起的压力和流型变化较平缓 ,瞬态效应小 .流量变化后产生沿线传播的压力波和空隙波 ,二者与流型相关 ,决定瞬态过程的发展 .压力变化的传播速度在气量变化时等于声速 ,在液量变化时等于空隙波波速 .
The transient process caused by the change of flow rate often occurs in the gas-liquid mixing pipeline, and the transient experiment of the flow rate change is carried out in the large multiphase flow experimental loop. The sudden increase of gas volume produces the pressure excess increment, which is related to the flow pattern: The overshoot of stratified flow is due to the inertia of the gas, and it is due to the combined effect of gas compressibility and liquid inertia when the mass flow and slugging flow. When the gas volume suddenly drops, the expansion wave propagates along the flow path. May appear corresponding to quasi-steady-state changes did not occur in the flow pattern.Compared with the gas abrupt change, the liquid pressure caused by sudden changes in pressure and flow pattern is relatively gentle, transient effect is small.When the flow changes, the pressure wave and the gap wave propagating along the line, The two are related to the flow pattern, which determines the development of the transient process.The propagation velocity of the pressure change is equal to the sound velocity when the gas volume changes and equal to the space velocity when the liquid volume changes.