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文献[1]和[2]提出的同轴双旋流方案,从燃烧室前端供入燃烧与掺混空气,形成“中心回流区”和“环状回流区”,在两股反向气流交界处,紊流度高,扩散燃烧快,对缩短火焰筒和均匀出口温度场有利。掺混空气量随加温比提高而减少,表明未来高性能燃烧室的头部供气比例较高,因此深入研究这类燃烧室的流动规律,对发展高性能发动机有重要意义。本文重点研究内外旋流角的大小和方向对流场的影响,寻求内外旋流角的较佳配合。
The co-axial double-swirl scheme proposed in references [1] and [2] feeds combustion and mixed air from the front end of the combustion chamber to form a “central recirculation zone” and an “annular recirculation zone” Department, turbulence high, fast diffusion combustion, to shorten the flame tube and uniform outlet temperature field beneficial. The amount of blended air decreases with the increase of heating ratio, which indicates that there is a high proportion of head gas supply in high-performance combustion chambers in the future. Therefore, in-depth study on the flow pattern of such combustion chambers is of great significance for the development of high-performance engines. This paper focuses on the influence of the size and direction of the swirl angle inside and outside on the flow field and seeks the better cooperation between the swirl angle inside and outside.