摘要
喷口结构形式对喷嘴雾化性能有重要影响,本文采用计算流体动力学方法研究了不同雾化气体压强(P0)下喷口结构对喷射气体流场及导流管顶端静压强(Pt)的影响规律,建立了紧耦合型、环缝HPGA(High Pressure Gas Atomizer)型和Laval环孔型三种喷口结构的喷射模型,并用Fluent软件进行了模拟计算.研究结果表明:三种喷嘴结构的抽吸压强及导流管顶端静压强径向梯度随雾化压强的变化表现出不同的变化趋势;Laval环孔型喷嘴在雾化压强较低时雾化性能最佳,HPGA型喷嘴在高压时雾化性能最佳;数值计算结果与试验观测值吻合较好.
The jet profile of gas atomizers has a great influence on atomization efficiency. The computational fluid dynamic method was adopted to investigate the effect of jet profiles on the gas flow field and the melt tape pressure （Pt） under various atomization gas pressure （P0）. Gas flow models of close-coupled atomizer, annular slit HPGA （High Pressure Gas Atomizer） and De Laval nozzle were built and solved with Fluent. The numerical results indicated that both aspiration pressure and melt tip static pressure gradient of three atomizers showed different trends. Consequently De Laval nozzle＇s highest efficiency was obtained at low atomizing pressure while HPGA at high pressure. The numerical results agreed well with experiments.
出处
《西安工业大学学报》
CAS
2012年第12期994-999,共6页
Journal of Xi’an Technological University
基金
陕西省"13115"科技创新工程重大科技专项项目(2007ZDK-65)
关键词
雾化喷嘴
数值模拟
流场
静压强
atomizer
numerical simulation
gas flow field
static pressure
