为进一步提高小支板后低动压喷射的掺混增强性能,利用数值模拟方法对不带前引导面的小支板几何尺寸进行数值优化,对比分析不同长宽高几何尺寸对混合效率、穿透深度与总压损失的影响,研究发现小支板宽度越大,射流近场穿透效果越好;小支板越高后方射流穿透深度越大,但同时也带来更大的总压损失;小支板长度对燃料空气掺混特性影响不大,小支板过短会增大燃烧室总压损失,过长会带来额外的冷却负担。

In order to improve the mixing performance of low pressure injection behind the small supported plate, the numerical simulation has been carried out to optimize the geometry size of small supported plate without front guide surface, and the influence geometric dimensions of different length, width and height on mixing efficiency, depth of penetration and total pressure loss were comparatively analyzed. By studies, it was noted that the bigger the width, the better the penetration of jet on near field, and the greater the height, the bigger the penetration depth, but it also brought a greater total pressure loss at the same time. The influence of length on mixing characteristics was little, but it would increase the total pressure loss on combustion chamber if the small supported plate was too short, and it would bring additional cooling load if the small supported plate was too long.