中文摘要：

采用激光诱导荧光技术研究了空气流速对燃油碰壁形成的附壁油膜厚度二维分布的影响。同时，采用CCD相机记录了油膜的形状、长度和面积变化。结果表明，随着空气流速的增加，油膜形状从圆形变成椭圆形，同时，油膜厚度减小。随着空气流速的增加，垂直于空气流动方向上的油膜长度减小。当空气流速低于10m／s时，随着空气流速的增加，沿着空气流动方向上的油膜长度减小，油膜面积减小。但当空气流速继续增加到10m／s以上时，沿着空气流动方向上的油膜长度和油膜面积将会随着空气流速的增加而增加。

英文摘要：

The effect of air velocity on two-dimensional distribution of the wall-wetted fuel film thickness was investigated with laser induced fluorescence technique. The film image, film length and film area were recorded by a CCD camera. The results show that, with the increase of air velocity, the film shape is shifted from a circle type to an ellipse type along with the decrease in film thickness. The film length in the vertical direction of airflow is decreased with the increase of air velocity. The film length in the airflow direction and the film area are decreased with the increase of air velocity when air flow velocity is less than 10 m/s. When air flow velocity is larger than 10 m/s, the film length in the airflow direction and the film area are increased with the increase of air flow Velocity.