排灌机械工程学报Issue(7)：558-562,5.DOI:10.3969/j.issn.1674-8530.13.1035
液气射流泵扩散管内部流动试验研究
Experimental study on flow in diffuser of liquid-jet gas pump
摘要
Abstract
The liquid-jet gas pump has found its applications in jet aeration system and gas absorption etc.A study on the two-phase flow in diffuser of the pump is essential for the pump design and applica-tion.Thus,the pressure on the diffuser wall of a liquid-jet gas pump (LJGP)was measured by means of pressure sensors and the pressure recovery profile in the diffuser was obtained under various water working pressures and liquid-to-gas volumetric flow rate ratios.The LJGP was installed vertically;its diffuser and throat were made of Plexiglas.The results showed that the wall pressure recovery is in the range of about 2-5 kPa,the pressure profile drops initially then rises along the diffuser wall.There-fore ,the effect of static pressure caused by the height of a vertical LJGP on flow in its diffuser needs to be taken into account.According to an analysis of flow in the diffuser,it was shown that the flow pat-tern has a great influence on its jet mixing characteristics;further the change in the location where the liquid-jet starts to mix with the gas can affect diffusing angle of the diffuser significantly.Particle image velocimetry (PIV)was used to map the liquid velocity in the diffuser,and the axial velocity distribu-tions in cross-sections were obtained at two liquid-to-gas volumetric flow rate ratios.The results illus-trated that the axial velocity is reduced by about 20%,and it was not uniform in cross-sections;the flow with high velocity has been deflected to one side wall in the diffuser at a low flow rate ratio.关键词
液气射流泵/射流混合/两相流/扩散管/压力/PIVKey words
liquid-jet gas pump/jet mixing/two-phase flow/diffuser/pressure/PIV分类
农业科技引用本文复制引用
向清江,王超,吴燕兰,李红..液气射流泵扩散管内部流动试验研究[J].排灌机械工程学报,2014,(7):558-562,5.基金项目
国家自然科学基金资助项目 （）
