【摘要】 研究了喷射油膜厚度随壁面温度的变化规律。设计了PID闭环加热平板,以及二维可调节移动平台,使用激光诱导荧光法(LIF)定量测量了在垂直情况下,喷射燃油到平板上形成的附壁油膜厚度随温度变化的规律,并通过高速CCD摄像机拍摄照片进行比较。研究结果表明:随着壁面温度从26℃增加到120℃,附壁油膜的厚度减小,油膜最厚处的厚度从80μm下降到35μm,同时油膜覆盖面积从5.66 cm2减小到1.55 cm2;试验还测量了油膜厚度与油膜形成时间之间的关系,得出在喷油结束40 ms时,油膜厚度达到最大值。更多还原

【Abstract】 In order to measure accurately the wall-adhering film thickness of the impinging fuel spray,an experiment device was designed.It included a two-dimensional adjustable moving table and a PID closed-loop control heated plate on it.The fuel spray injected towards the plate in perpendicular direction and the wall-adhering film thickness were measured with laser induced fluorescence(LIF) and shot by high speed CCD camera for comparison.Results show that with the wall temperature rising from 26℃ to 120℃,the fuel film thickness decreases.It lessenes from 80μm to 35μm in the thickest position and the area of the fuel film also reduces from 5.66cm2 to 1.55cm2.The history of the film thickness change with the time after injection was also obtained which shows the thickness of the fuel film reaches the maximum value 40ms after close of injection.更多还原