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为了探寻高效的冷却技术,将多斜孔壁冷却结构应用于燃烧室火焰筒中,在实际工作条件下,对三种孔排布方式的火焰筒冷却特性进行了数值模拟。研究了斜排孔阵的周向偏移量H相对周向孔间距p的变化(模型A:H/p=0.2;模型B:H/p=0.4;模型C:H/p=0.5)对冷却特性的影响。计算结果表明,在燃烧室进口条件相同时,H/p的变化对总冷却用气量的影响很小,但对火焰筒的传热特性有明显影响,模型C的冷却效果优于模型A和B,并且火焰筒出口的温度分布不均匀系数ε较小。
In order to explore efficient cooling technology, the multi-inclined-hole cooling structure is applied to the combustion chamber flame tube. Under actual working conditions, the cooling characteristics of three kinds of holes are numerically simulated. The variation of the circumferential offset H of the array of oblique holes relative to the pitch p of the circumferential holes was investigated (model A: H / p = 0.2; model B: H / p = 0.4; model C: H / p = 0.5) Effect of cooling characteristics. The results show that the H / p variation has little effect on the total cooling gas consumption when the inlet conditions of the combustion chamber are the same, but has a significant effect on the heat transfer characteristics of the flame tube. The cooling effect of model C is better than that of the model A and B , And the temperature distribution at the outlet of the flamethrower is smaller.