中文摘要：

利用高速摄影和激光荧光法研究了汽油油柬碰撞平板后壁面上油膜的发展过程。分析了喷射高度、喷射角度及喷油脉宽对油膜面积及油膜最大厚度的影响，定量地得到了不同参数下的最大油膜厚度和油膜面积。试验结果表明，喷射高度增大时，最大油膜厚度和油膜面积都减小，附壁燃油量减少；喷射角度减小时，最大油膜厚度减小，而油膜面积却增大，有利于燃油挥发；喷油脉宽增大时，最大油膜厚度和油膜面积都增大，附壁燃油量也增加。利用无量纲时间，对油膜面积的变化速度研究发现，无量纲时间在1．5之后，油膜面积基本不再变化。

英文摘要：

The fuel film development process after gasoline spray impingement on a flat wall was inves- tigated using a high speed camera and the laser induced fluorescent （LIF）. The film area and the biggest thickness were quantitatively measured as a function of the impinge distance from the injector to the wall, the impinge angle against the wall and the injection duration. The experimental results indicate that the biggest film thickness and the film area will decrease with the increase of the impinge distance. There is smaller quantity of fuel on the wall. The biggest film thickness and the film area will increase with the increase of the injection duration which means larger quantity of fuel on the wall. When the impinge angle declines, the biggest film thickness will decrease, the film area will increase. and the wall wetted fuel film is easy to evapo- rate. The change velocity of the film area was discussed by means of a non-dimensional time. The results show that the film area has almost no change after the non-dimensional time of 1.5.