气液针栓喷注单元雾化特性试验

Experiment on Spray Characteristics of Gas-Liquid Pintle Injector Unit

关键词:  气液针栓喷注单元  雾场形态  雾化模式  雾场浓度  液滴SMD

Key words:  Gas-liquid pintle injector unit  Spray shape  Spray pattern  Spray density  Droplets SMD

摘要:

为研究气液针栓喷注单元的雾化特性，采用高速相机和激光相位多普勒（PDA）获得了雾场形态、雾化模式、雾场浓度分布、液滴SMD分布和速度分布。结果表明：气液针栓喷注单元的雾化模式为剪切破碎，雾场形态为实心锥形雾场；SMD变化范围随局部动量比增大而增大，且SMD范围有向两端扩大的规律；SMD沿径向逐渐增大；随着局部动量比增大，针栓头下方回流区的轴向长度减小；雾场主流区域随局部动量比增大从雾场中心向外偏移，远场区域合速度沿径向呈先增大后减小规律。

Abstract:

In order to study the spray characteristics of gas-liquid pintle injector unit， the effects of local momentum ratio on spray pattern， Sauter mean diameter（SMD） distribution and the velocity field were obtained by using high-speed camera and phase doppler anemometry（PDA）. The results show that the spray pattern of gas-liquid pintle injector unit is shear breakup. The spray of gas-liquid pintle injector is shaped as a solid cone. The variation range of SMD increases with the local momentum ratio increasing， and the range of SMD has a law of expansion to both ends. The SMD increases along the radial direction. With the local momentum ratio increases， the axial length of the central recirculation zone decreases and the main flow area of spray field is shifted outwards from the center of spray field. In the far field region， the resultant velocity increases first and then decreases along the radial direction.