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本文对带有收扩段的轴对称旋流-突扩燃烧室模型的冷态流场进行了试验和数值计算.当旋流角为45°时,涡破碎是一个较弱的转变过程,流场受尾喷口收缩的影响较小.所以,带有收扩段和45°旋流角的旋流燃烧室比起其他结构形式的同轴旋流-突扩燃烧室具有类似超临界流动的特点.试验表明:当旋流角大于45°时,中心回流区反而减小.因此,对于旋流燃烧室来说,旋流强度增大,中心回流区并不一定增大.本文采用扩编的TEACH程序和SIMPLE方法对旋流流场进行了数值模拟计算.数值计算结果比较接近试验结果.
In this paper, the cold flow field in an axially symmetric swirl-to-expansion combustor model with converging and diverging sections was tested and numerically calculated.When the swirl angle was 45 °, eddy crushing was a weaker transition process, and the flow Field is less affected by the shrinkage of the tail nozzle, so the swirl combustor with expansion and contraction section and 45 ° swirl angle has the characteristics of similar supercritical flow compared with the coaxial swirl-combustor with other structures The experimental results show that when the swirl angle is larger than 45 °, the central recirculation zone decreases, so the swirling intensity increases and the central recirculation zone does not necessarily increase for the swirling combustion chamber.In this paper, The program and SIMPLE method are used to simulate the swirling flow field and the numerical results are close to the experimental results.