摘要
在轴向气流作用下液体轴对称抛撒的研究,是以飞行物体在运动状态下向大气抛撒液体燃料所导致的破碎和雾化为背景的。为了研究在轴向气流作用下液体轴对称抛撒所产生的雾场特性,本文提出了一种新的组合型实验设备。该设备由两台激波管、一套电子同步控制系统组成,可以观察在轴向气流作用下液体轴对称抛撒、破碎和雾化的过程。通过在此设备上的一系列实验,获得了在不同压力和不同气流速度下液体轴对称抛撒的近场纹影照片。通过对照片的研究发现,液体轴对称抛撒具有两个明显的阶段:液核生长阶段和液核稳定阶段。另外近场云雾区轮廓有明显的转折点,此转折点即为液核发生首次破碎的位置。进一步分析表明,轴向气流能促使液体轴对称抛撒首次破碎发生的时间缩短。
Experimental investigation of axisymmetrical dissemination of liquid has important background. The purpose of this paper is to study the near-field characteristics of axisymmetrical dissemination of liquid under the action of axial airflows. To investigate the effect of the axial airflow on the primary breakup of axisymmetrical dissemination, a combination facility was developed, which is composed of two shock tubes, a set of electronic synchronous equipment. By using the combination facility, many schlieren photographs of the axisymmetrical dissemination, breakup and atomization of the liquid under the action of axial airflow were obtained. From these photographs, it can be found that the development of liquid core of axisymmetrical dissemination had two stages: the growing stage of liquid core and the stable stage of liquid core. It can also be found that there was a turning point at the boundary of liquid dissemination. This turning point can be regarded as the position where the primary breakup took place. From observing various positions of primary breakup under different experimental conditions, it follows that the axial airflow can greatly enhance the primary breakup of axisymmetrical dissemination of liquid. From these observations, if can also be found that when the pressure in the driver section of small shock tube increase, the position where the primary breakup takes place become farther from the axis of the annular spray nozzle.
出处
《实验力学》
CSCD
北大核心
2004年第1期13-18,共6页
Journal of Experimental Mechanics
基金
国家自然科学基金(No.10072061)资助项目
