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文中建立一种激光测量燃油管道润湿阻力的方法及实验装置。得到了小流管条件下润湿阻力大小的解析表达式,即液体表面斜率与反射亮场及入射光通光半径之间的解析关系。根据弯曲液体表面光反射原理及光电自动检测原理,建立了润湿阻力的激光测量实验装置。依据激光反射图样光斑大小可以测出液面的斜率和液面与管壁的接触角。再根据润湿阻力的解析式,得到了润湿阻力大小。实验上,观察到特殊的弯曲液体表面激光反射图样,该图样为圆形光斑,具有明显的干涉圆环。圆形光斑的大小不仅与入射光通光半径有关,而且与表面的弯曲度有关。理论上润湿阻力的大小与液体的表面张力成正比,与接触角的余弦值成正比。本装置具有无损和自动化特点。
In this paper, a laser measuring method of wetting resistance of fuel pipeline and experimental device were established. The analytic expression of the wetting resistance under the condition of small flow tube is obtained, that is, the analytic relationship between the liquid surface slope and the reflected bright field and the incident light radiance radius. According to the theory of light reflection on the curved liquid surface and the principle of photoelectric automatic detection, a laser measuring experimental device of wetting resistance was established. According to the size of the laser reflection pattern spot can be measured the slope of the liquid level and the contact angle of the liquid surface and the pipe wall. According to the analysis of wetting resistance, wetting resistance has been the size. Experimentally, a special laser-reflecting pattern of curved liquid surface was observed, which is a circular spot with a clear interference ring. The size of a circular spot is not only related to the radius of the incident light, but also to the curvature of the surface. Theoretically the size of the resistance to wetting is proportional to the surface tension of the liquid and to the cosine of the contact angle. The device has the characteristics of non-destructive and automated.