基于PIV的凝胶模拟液撞击雾化速度场实验研究

Experimental Study on Impinging Velocimetry of Gel Simulants Based on PIV

为了更好研究凝胶推进剂的雾化,采用时间分辨粒子图像测速(TR-PIV),研究了不同撞击角度(45°,60°,75°,90°和120°)和射流压差(0.4MPa^0.8MPa)对凝胶推进剂雾化速度的影响。实验结果表明:雾化液滴速度对于撞击轴线呈单峰对称分布,距离撞击点越远,雾化液滴速度越小且分布越均匀;增大撞击角和增大射流压差都可提高凝胶推进剂有效撞击速度,即增加撞击后液体动能转换液体破碎所需的能量,雾化质量提高;当有效撞击速度大于27.9m/s时,实验室配置的凝胶推进剂可充分雾化。

In order to study the atomization of gelled propellant,the effects with different pressure drop and impinging angle on atomization of impinging injector with gelled propellant were studied by a Time-Resolved Particle Image Velocimetry(TR-PIV),in which the injection impinging angles were 45°,60°,75°,90°and 120°,the pressures drop ranged from 0.4 MPa to 0.8MPa.The experimental results indicate that the distribution of atomization velocity is symmetry by the impinging axis and has one peak.The further from the strike spot,the smaller the atomization velocity and more uniform.The effective impinging speed of gel propellant is improved by increasing impinging angle and pressure drop.That is because the liquid kinetic energy converted to the energy of liquid broken is enhanced,and the atomization quality is improved.Finally,the gel propellant prepared in laboratory can be fully atomized when the effective impinging velocity is above 27.9m/s.