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本文用ＳＩＭＰＬＥ算法在适体正交曲线坐标网格下对直喷式柴油机复杂形状燃烧室（如方形，四角形等）中的空气运动进行了多维数值模拟计算，并与传统中圆柱形燃烧室内流动进行了对比。其中方形燃烧室的结果还与激光多普勒测量结果进行了对比。在试验装置中，为了克服激光束在燃烧室内表面的反射和折射造成的困难，作者采用了折射率匹配技术——工作介质是一种液体，它的折射率与制成气缸、活塞和燃烧室形状的有机玻璃的折射率完全相同。这样，激光束在燃烧室壁处不再受到折射和反射，测量体可置于燃烧室内任意位置，从而可以获得复杂形状燃烧室内流场的详细信息。
In this paper, the SIMPLE algorithm is used to simulate the air movement in the complex shape combustor (such as square, quadrangle and so on) of the direct injection diesel engine under the apodized orthogonal curvilinear coordinate grid, and compared with the conventional cylindrical combustion chamber Contrast. The results of the square combustor were also compared with the laser Doppler measurements. In the experimental setup, in order to overcome the difficulty of laser beam reflection and refraction on the inner surface of the combustion chamber, the author used index matching technology - the working medium is a liquid whose refractive index is proportional to the refractive index of the cylinder, piston and combustion chamber The shape of the plexiglass refractive index exactly the same. In this way, the laser beam is refracted and refracted at the wall of the combustion chamber and the measuring body can be placed anywhere in the combustion chamber, giving detailed information on the flow field in a complex shaped combustion chamber.