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为探究凹腔底壁不同喷射位置对碳氢燃料的燃烧性能的影响,在直联式超燃试验台上进行了凹腔底壁不同喷射位置的气态燃料(乙烯)、液态燃料(煤油)以及气泡雾化煤油(起泡气体为氢气、空气、氮气)的超声速燃烧试验。并针对凹腔底壁不同位置喷乙烯进行了数值仿真。通过分析燃烧室壁面压力与数值模拟结果得到:凹腔底壁不同喷射位置对气态燃料的点火性能影响不大,燃烧性能随喷点位置的后移下降。煤油通过靠近凹腔前缘的喷孔喷入可顺利点火,而通过靠近后缘的喷孔无法实现点火。应用氢气作为起泡气体的气泡雾化喷嘴后,实现了所有喷点的点火,但随着喷点位置的后移,煤油的燃烧性能下降。
In order to explore the influence of different injection positions on the bottom wall of the cavity on the combustion performance of hydrocarbon fuels, gaseous fuel (ethylene), liquid fuel (kerosene) Bubble atomization of kerosene (blister gas is hydrogen, air, nitrogen) supersonic combustion test. The numerical simulation of ethylene at different positions on the bottom wall of the cavity was carried out. By analyzing the wall pressure of the combustion chamber and the numerical simulation results, it is found that different injection positions on the bottom wall of the cavity have little effect on the ignition performance of the gaseous fuel, and the combustion performance decreases with the spray point position backward. Kerosene can be successfully ignited by injection through the injection hole near the front edge of the cavity, and ignition can not be achieved through the injection hole near the trailing edge. The application of hydrogen gas as foaming gas bubble atomization nozzle, to achieve all the spray point of ignition, but with the spray point position backward, kerosene combustion performance decreases.