Three dimensional velocity measurement in cylinder flow by colored layers method

由于发动机缸内流动对燃烧性能有很大影响。热效率和废气排放。气流速度的测量是发动机研究中的重要问题之一。本研究采用流动显示的方法，对发动机内的速度进行了测量。此外，还采用彩色层法对示踪剂图像的深度方向进行了位置区分。首先，对常用的二维测量方法进行了分析，发现电光快门对测量系统是有效的。流动方向的确定采用双脉冲法，即一幅图像的曝光时间短，一幅图像的曝光时间长，两次曝光。并通过计算检验了示踪剂的可追溯性，确定了最合适的示踪剂。有色层是由光源的棱镜光谱制成的。通过示踪剂的线性运动来检验基本程序。该系统的原理得到了证实，但对深度方向的定位精度不高。示踪剂图像也是在建模的圆柱体上拍摄的。对深度定位数据进行彩色图像处理，找出大致位置。在这些结果出来后，应该做进一步的调查。

As the in-cylinder flow of an engine effects largely to the combustibility. thermal efficiency and exhaust emissions. the measurement of flow velocity is one of the most important problem in engine researches. In this research, the velocity in ati engine was measured in using flow visualization method. In addition to this, the colored layers method was adopted to distinguish the location of the tracers to the depth direction of the tracer images. First of all, usual twodimensional method was examined and it was found that the electro-optical shutter was effective to the measuring system. The flow direction was determined by the two-pulse method, that is, the double exposed method in one short and the other long exposure time in one image. And the traceability of the tracers were examined by calculatiotis and the most suitable one was adapted. The colored layers were made by the prismatic spectrum of the light source. The fundamental procedure was examined by the linear movement of a tracer. The priciple of this system was confirmed but the accuracy of finding location to the depth direction was not sufficient. Also the tracer image was taken at the modelized cylinder. The data of the depth location were analized by the image processing in color and the approximate location was found. Further investigation should be done after these results.