贫油极限 meaning in English

lean-limit
poor mixture limit
weak limit

The result indicates that the range of stable lean operation varies greatly for different cavity depth d and length - depth - ratio l / d , it increases with increasing d and l / d , and increases , followed by decreasing with increasing incline angle of aft wall
研究发现:凹腔深度和长深比对凹腔火焰稳定器的贫油极限影响较大,贫油稳焰范围与深度、长深比成正比,随后壁倾斜角的增大先增大后减小。
It is found that the liquid kerosene of injection upstream cavity could finish the process of atomization and evaporation in short distance , and enter into cavity through convection . aft wall is the primarily area of flame holding in cavity , and the only area when near the lean blowout limit , flame in area of fore wall are spread from it . cavity shear layer in reaction flow angle greatly to the main flow direction , and couldn ’ t reattach to aft wall anymore , it appears great difference in characteristics of cavity flowfield between non - reaction and reaction state
研究发现:凹腔上游喷注的液体燃料能够迅速雾化、蒸发,并在较短距离内依靠对流输运过程进入凹腔内部;凹腔后壁始终是凹腔火焰驻留的主要区域,在贫油极限时,也是唯一区域,并存在明显的火焰由后壁向前壁的传播过程;燃烧状态下的凹腔剪切层以较大角度向下游主流发展,不再附着于凹腔后壁,与冷流中的凹腔流场特征相差较大。