论文部分内容阅读
设计了一台爆轰环腔外径100mm、内径80mm、长117mm的不带有尾喷管的旋转爆轰发动机燃烧室,并进行了实验和数值模拟研究,来了解不同当量比下的燃烧和流动特性。在该燃烧室头部,空气通过60个直径2mm孔轴向喷射,氢气通过2mm宽环缝喷射。氢气和空气最大供给总压分别可达12和10.5MPa。实验发现,当量比大于2时,燃烧发生在燃烧室以外,为爆燃;当量比接近于1时,燃烧室内存在多个反向旋转爆轰波,爆轰波平均速度较低,不超过1000m/s;当量比小于0.58时,仅有一个爆轰波准稳态旋转。在当量比为0.55时,旋转爆轰波传播速度为1274m/s。在当量比为1时,进行了17s无热防护的旋转爆轰发动机实验,未发现燃烧室有明显烧蚀。数值模拟表明在流量为400g/s时,有3个爆轰波同向旋转,外壁面侧传播速度约为1998m/s。
A rotary detonation engine combustor without tail nozzle was designed to detonate the outer chamber of 100 mm diameter, 80 mm diameter and 117 mm length, and the experiments and numerical simulations were carried out to understand the combustion at different equivalence ratios Flow characteristics. At the head of the combustor, air is injected axially through 60 holes of 2 mm diameter and hydrogen is injected through a 2 mm wide gash. The maximum total pressure of hydrogen and air supply up to 12 and 10.5MPa. The experimental results show that when the equivalence ratio is greater than 2, the combustion occurs outside the combustion chamber and deflagrates. When the equivalence ratio is close to 1, there are multiple reverse rotation detonation waves in the combustion chamber, and the average velocity of the detonation wave is lower than 1000 m / s; when the equivalence ratio is less than 0.58, only one detonation wave quasi-steady-state rotation. When the equivalence ratio is 0.55, the propagation velocity of rotary detonation wave is 1274m / s. When the equivalence ratio was 1, a 17s rotary detonation engine experiment without heat protection was carried out, and no obvious ablation of the combustion chamber was found. Numerical simulation shows that when the flow rate is 400g / s, three detonation waves rotate in the same direction and the propagation velocity on the outer wall surface is about 1998m / s.