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为探究基于支板凹腔结构的超燃燃烧室性能,在超声速来流条件下,采用带中心支板且凹腔长高比为7.5的三维超燃燃烧室模型,针对支板阻塞比、扩张段扩张角、不同燃料喷射方式以及不同燃料当量比对燃烧室相关性能的影响进行了数值研究。研究发现:支板阻塞比会对隔离段内的激波分布以及支板后缘速度分布产生明显影响,而扩张段扩张角会影响超声气流在燃烧室出口的膨胀状态;采用壁面以及中心喷注支板同时喷油方式在保持高燃烧效率的同时会扩大整个燃烧室的燃烧区域;当采用单独壁面喷油方式时,凹腔内静温分布会随着当量比的变化发生相应的改变,同时会在当量比为0.51~0.74时达到相对较高的燃烧效率。
In order to explore the performance of the super-combustion combustor based on the structure of the backplate cavity, under the conditions of supersonic flow, a three-dimensional model of the superconducting combustion chamber with a central plate and an aspect ratio of the cavity of 7.5 was adopted, The influence of different expansion angles, different fuel injection modes and different fuel equivalence ratios on the performance of the combustion chamber was numerically investigated. The results show that the ratio of support to block has a significant effect on the shock wave distribution and the velocity distribution of the trailing edge in the isolation section, while the expansion angle of the expansion section will affect the expansion of the ultrasonic airflow at the exit of the combustion chamber. While maintaining the high combustion efficiency, the fuel injection mode of the support plate will enlarge the burning area of the whole combustion chamber. When adopting the separate wall injection method, the static temperature distribution in the cavity will change correspondingly with the equivalence ratio change, meanwhile, In the equivalent ratio of 0.51 ~ 0.74 to achieve a relatively high combustion efficiency.