运动状态下液体轴对称抛撒首次破碎的实验研究

Experimental Study on the Primary Breakup of Axisymmetrical Dissemination of Liquid in Motion

在实验室条件下利用组合式激波管设备,对运动状态下液体轴对称抛撒进行了实验研究。通过纹影装置获得其所形成雾化场的外形轮廓照片,测量获得了液核发生首次破碎的位置与对称轴之间的距离。通过对抛撒过程中R-T不稳定性与K-H不稳定性的分析认为,轴向气流作用下液体轴对称抛撒的首次破碎点与对称轴的距离主要由轴向气流的速度、轴向气流的密度、液体轴对称抛撒的出口速度、抛撒液体的表面张力系数、环形喷口的宽度等参数所决定。在此基础上,利用相似性理论和无量纲分析,获得了运动状态下液体轴对称抛撒首次破碎点与对称轴之间的距离与相关参数的无量纲关系式。

The characteristic of breakup and atomization procedure of axisymmetrical dissemination of liquid in motion is investigated. With the schiieren apparatus, photos of the profile of the dissemination field were obtained. And the distance between the point of primary breakup of liquid and the axis was measured. With the analysis of R-T instability and K-H instability of the dissemination procedure, it can been concluded that the distance which referred above is chiefly affected by the five parameters including the velocity of axial airflow, the density of axial airflow, the velocity of dissemination liquid, the interfacial tension of dissemination liquid and the width of annular nozzle. With the similarity theory and dimensionless analysis＇method, the relation and corresponding dimensionless relation of the distance between the point of primary breakup and the axis are given.