排灌机械工程学报2012，Vol.30Issue(2)：136-140,152,6.DOI:10.3969/j.issn.1674-8530.2012.02.003
多孔喷嘴射流泵流动模拟与涡结构分析
Flow simulation and vortex structure analysis of multi-nozzle jet pumps
摘要
Abstract
Based on the finite volume method and Realizable k - e turbulence model, the flow field inside multi-nozzle jet pumps was investigated numerically. The calculation reliability was validated by experimental data. Based on the simulation results of streamwise and spanwise vorticity distribution and their peak value variation, the mixing mechanism of the two fluids was analyzed. The results show that the multi-nozzle could promote the mixing and improve pump efficiency. The vortex has great effects on the mixing. Relative to the streamwise vorticity, the spanwise vorticity value is large and the attenuation becomes flat. The streamwise vortex plays a major role in the mixing. The value and attenuation rate of streamwise vorticity determine the effect of the mixing in the throat. For a definite vorticity value, the greater the streamwise vorticity value is, the faster it decays. The smaller the spanwise vortex size, the faster the mixng, and the higher the pump efficiency. The vorticity distribution in the throat indicates a central nozzle may lead to greater losses. The optimum distribution is that all the nozzles are on a circle.关键词
多孔喷嘴射流泵/喷嘴结构/流场分析/流向涡/展向涡Key words
multi-nozzle jet pump/nozzle structure/flow fields analysis/streamwise vortex/spanwise vortex分类
农业科技引用本文复制引用
龙新平,姚鑫,杨雪龙..多孔喷嘴射流泵流动模拟与涡结构分析[J].排灌机械工程学报,2012,30(2):136-140,152,6.基金项目
国家自然科学基金资助项目(51179134) （51179134）
中央高校基本科研业务费专项资金资助项目(201120802020006) （201120802020006）
