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为研究入口非均匀流对亚燃燃烧室性能的影响,基于进气道出口试验测量数据,构造三种典型非均匀流型,对燃烧室进行三维数值计算,研究非均匀流对马赫数分布、温度场、燃油分布及燃烧效率的影响。结果表明:基于均匀流供油律,非均匀流影响燃烧室性能的机理是受流速主导作用,低速区域当量比偏高,高速区域当量比偏低。导致扩压段边区燃烧,烧蚀外环阻塞结构,而内圈高速区域燃烧组织效果欠佳。匹配供油律后,非均匀流燃烧性能有所改善,但难以达到均匀流水平。所以,提出了改进入口流均匀性及减弱非均匀流对燃烧不良影响的措施。
In order to study the influence of inlet non-uniform flow on the performance of the sub-combustion chamber, three typical non-uniform flow patterns were constructed based on the inlet test data. The three-dimensional numerical calculation of the combustion chamber was carried out to study the Mach number distribution, Temperature field, fuel distribution and combustion efficiency. The results show that the mechanism of non-uniform flow influencing the performance of the combustion chamber is dominated by the flow rate based on the uniform flow and oil supply law. The equivalent ratio is high at low speed and the low equivalent ratio at high speed. As a result, the combustion zone in the diffuser section is burned to ablate the obstructed structure of the outer ring, while the combustion structure in the high speed region of the inner ring is ineffective. Matching the oil supply law, non-uniform flow combustion performance improved, but difficult to achieve a uniform flow level. Therefore, measures to improve the uniformity of the inlet flow and to reduce the effect of the non-uniform flow on the combustion are proposed.