CAJ | 학술논문

气液两相混合流体在叶片式混输泵内的流动与入口段气液混合程度有直接的关系，故在混输泵入口前端设置了自行设计的缓冲均化器，并通过可视化试验探索入口段气液两相流型及气泡直径随转速和入口含气率的变化规律。研究发现：经过缓冲均化器后，气液两相流体在混输泵入口段表现为均匀的泡状流，无大团气泡聚集现象，说明缓冲均化器结构及多孔管开孔方案合理，能够起到均匀混合气液两相流体的作用；在同一转速和液相流量下，混输泵入口段气泡直径变化规律呈正态分布，随着入口含气率的增加(0～50%)，气体总流量增加，在均化器中与水混合后形成的气泡初始直径逐渐增加，使得混输泵入口段气泡直径也逐渐增加；在同一液相流量和入口含气率工况下，气泡的初始直径相同，而随着混输泵转速的增加(1800～2700 r/min)，入口段流体旋转角速度增大，导致液相对气相的拖曳力也相应增大，最终导致气泡直径变小；绘制了泵入口气泡直径随入口含气率及转速的变化规律曲线，可以为混输泵内流场数值模拟中入口气液两相流型及平均气泡直径的设置提供参考。
기액량상혼합류체재협편식혼수빙내적류동여입구단기액혼합정도유직접적관계，고재혼수빙입구전단설치료자행설계적완충균화기，병통과가시화시험탐색입구단기액량상류형급기포직경수전속화입구함기솔적변화규률。연구발현：경과완충균화기후，기액량상류체재혼수빙입구단표현위균균적포상류，무대단기포취집현상，설명완충균화기결구급다공관개공방안합리，능구기도균균혼합기액량상류체적작용；재동일전속화액상류량하，혼수빙입구단기포직경변화규률정정태분포，수착입구함기솔적증가(0～50%)，기체총류량증가，재균화기중여수혼합후형성적기포초시직경축점증가，사득혼수빙입구단기포직경야축점증가；재동일액상류량화입구함기솔공황하，기포적초시직경상동，이수착혼수빙전속적증가(1800～2700 r/min)，입구단류체선전각속도증대，도치액상대기상적타예력야상응증대，최종도치기포직경변소；회제료빙입구기포직경수입구함기솔급전속적변화규률곡선，가이위혼수빙내류장수치모의중입구기액량상류형급평균기포직경적설치제공삼고。
The gas-liquid two-phase flow field inner a rotodynamic multiphase pump has a direct relationship with the mixed condition of gas and liquid in the entrance. An independent designed buffer tank is installed in front of the multiphase pump and visualization tests are conducted to investigate the flow pattern of gas-liquid two phases and the distribution rule of bubble size in different conditions of rotational speed and inlet gas volume fraction (IGVF). The test results show that the flow pattern of the gas-liquid two phases is presented as uniform bubble flow after the mixture passing through the buffer tank and there is no aggregation of big bubbles, which can verify the rationality of the designed structure and the opening scheme on central porous pipe of the buffer tank. More importantly, the buffer tank has the ability to well mix the gas and liquid. From the analyses of bubble sizes, a normal distribution of them can be seen. With the increase of IGVF (0-50%), the gas volume flow rate increases and then the initial bubble size increases, which cause the bubble size also grows in the entrance when the rotational speed and liquid volume flow rate are constant. When the IGVF and liquid volume fraction are constant, the initial bubble sizes keep constant too. However, with the increase of rotational speed (1 800-2 700 r/min), the drag force between liquid and gas increases correspondingly, which causes bubble sizes decrease. In addition, curves are drawn to express the relationships of bubble size with IGVF and rotational speed, which will provide theoretical support for the setting of inlet boundary conditions to simulate the inner flow of the multiphase pump.