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本文叙述了利用常规三孔测针对一种矩形截面的模型蒸发管式燃烧室的头部冷态流场所进行的部分实验研究工作。从测得的流谱图中可以发现这类燃烧室火焰筒头部流场具有如下明显特征:蒸发管射流的核心部分在接近前壁时衰减得很快,不能简单地按照自由射流的概念处理;回流区的形成是一次和二次进气射流对周围气体卷吸作用的结果,由于进气射流相互之间和进气射流与壁面之间的碰撞作用,使流场变得十分复杂。文中还对用三孔测针得到的结果和用二维多普勒激光风速仪测得的结果进行了对比,结果表明两者基本一致。可见,在一定条件下,利用三孔测针测量复杂流场仍然是一种可行的手段,并得出了一些有益的使用经验。
This paper describes the experimental study of the cold flow field at the head of a rectangular tube with a rectangular cross section using a conventional three-hole stylus. From the measured fluid chromatogram, it can be found that the flow field in the head of such a combustion chamber has the following obvious characteristics: the core of the eductor tube decays very fast when approaching the front wall and can not be simply treated in accordance with the concept of free jet . The formation of the recirculation zone is the result of the entrainment of the surrounding gas by the primary and secondary intake jets. Due to the collision between the intake jets and the collision between the intake jets and the wall, the flow field becomes very complicated. The paper also compares the results obtained with the three-hole stylus with the results obtained with the two-dimensional Doppler laser anemometer, and the results show that the two are basically the same. Visible, under certain conditions, the use of three-hole probe measuring complex flow field is still a viable means, and come to some useful experience.