针对贫油预混预蒸发燃烧室主燃级中横喷液雾现象进行研究，综合考虑RP-3航空煤油横喷液雾的雾化、蒸发和自燃过程构建自燃预测模型，基于CH基团随时间的变化规律对自燃延迟时间进行预测。结合试验测试结果对模型进行校验，并进一步分析温度、压力、流速、射流动量比等变量对自燃延迟时间的影响规律。结果表明：对于直射式喷嘴形成的横喷液雾，其下游的油气分布主要受射流动量比和流动速度的影响，射流动量比决定了液雾的总体油气比，流动速度则主要影响液滴的粒径及其蒸发时间；随着压力、射流动量比及气流速度的增加，自燃延迟时间均会缩短，相比于预混燃料液雾的自燃延迟时间受负温度效应的影响较弱。

A phenomenon of liquid jet in cross flow in fuellean premixed preevaporation combustor main stage was studied. The autoignition prediction model was constructed with considering the atomization, evaporation and autoignition process of liquid jets in cross flow for RP3 jet fuel sprays, eventually the autoignition delay time was predicted based on the time evolution of the CH in the liquidgas mixture. The model was validated by comparing to experimental results and was then utilized to analyze the influences of variables such as temperature, pressure, main stream velocity and liquidtoair momentum ratio on the autoignition delay time. The results show that for liquid jet in cross flow formed by directinjection type nozzle, its fuelair mixing downstream is mainly affected by the liquidtoair momentum ratio and main stream velocity, in which liquidtoair momentum ratio determines total fuelair ratio, while stream velocity mainly affects the droplet sizes and the related evaporation time; the autoignition delay time decrease with the increase of pressure, liquidtoair momentum ratio and main stream velocity. The autoignition delay time of spray is less affected by the negative temperature effect compared to premixed combustibles.

V231.2

国家科技重大专项（J2019-III-0004-0047)