对撞式喷嘴在模拟燃烧室内喷雾特性研究

Spray Characteristic of Impinging Nozzle in Simulated Chamber

为了研究对撞式喷嘴在燃烧室内的喷雾特性,采用三维相位多普勒粒子动态分析仪(PDA),测量了模拟燃烧室内对撞式喷嘴喷雾场参数的空间分布,分析了不同喷雾压力下雾化液滴的平均直径、轴向速度和径向速度的变化规律。结果表明:喷雾压力越大,液滴平均直径D30越小,正态分布特征越明显;随着喷雾向下游发展,液滴轴向速度分布向小速度偏移,喷雾压力越大,距离喷嘴较远的截面上,轴向速度损失越小;距离喷嘴越远,雾化液滴径向速度的数目分布越趋向某一狭窄速度段,且喷雾压力越大,这种分布特征越明显。

To research the spray characters of impinging nozzle in the combustion chamber,3D phase-Doppler particle analyzer（PDA）was used to measure the spatial distribution of spray field’s parameters in the simulated combustion chamber.The change rules of mean diameter,axial velocity and radial velocity of the atomized droplets under different injection pressures were inves-tigated.The results show that,the greater the injection pressure is,the smaller the mean diameter （D30） is,and the more obvious the normal distribution features become.With the spray developing downstream,the average of the axial velocity tends to be low.Less axial velocity loss appears for more injection pressure on the section far away from the nozzle.The quantitative dis-tribution of the radial velocity trends toward a narrow speed area while the distance between the measuring point and the nozzle increases,and greater injection pressure makes more obvious feature.