Experimental study of internal flow structures in cylindrical rotating detonation engines
Experimental study of internal flow structures in cylindrical rotating detonation engines
复制标题
圆筒旋转爆震发动机内流结构实验研究
DOI：
10.1016/j.proci.2020.08.001
复制
发表时间：
2021
影响因子：
3.4
通讯作者：
Funaki Ikkoh
中科院分区：
文献类型：
--
作者：
Yokoo Ryuya;Goto Keisuke;Kasahara Jiro;Athmanathan Venkat;Braun James;Paniagua Guillermo;Meyer Terrence R.;Kawasaki Akira;Matsuoka Ken;Matsuo Akiko;Funaki Ikkoh
在光学可达的多腔长空心旋转爆轰燃烧室中，对爆轰波的内部流动结构进行了实验研究。圆柱形RDC具有直径为20 mm的玻璃腔壁，这使我们能够捕获燃烧自发光。首次采用C_2H_4单键O_2和H_2-O_2为推进剂，在长70 mm的燃烧室中进行了燃烧试验。获得了底部附近具有强自发光区域的图像，证实了我们先前研究中发现的大部分热释放发生的区域的小范围。基于可视化实验，我们测试了具有40和20 mm的较短室壁的RDC。在较短的燃烧室中也观察到爆震波，其速度不受燃烧室长度差异的影响。与较长的燃烧室相比，推力性能也得到了保持，并且短圆柱形RDC与圆柱形（中空）或环形70 mm燃烧室RDC具有相同的比冲趋势。最后，计算了不同长度燃烧室的压力分布，发现它们与底部和出口处的实测压力也是一致的。我们的结论是，短室圆柱形RDC具有相同的长度和直径保持类似的推力性能较长的环形RDC，进一步扩大了紧凑型RDC的潜力。
The internal flow structures of detonation wave were experimentally analyzed in an optically accessible hollow rotating detonation combustor with multiple chamber lengths. The cylindrical RDC has a glass chamber wall, 20 mm in diameter, which allowed us to capture the combustion self-luminescence. A chamber 70 mm in length was first tested using C2H4single bondO2and H2–O2as propellants. Images with a strong self-luminescence region near the bottom were obtained, confirming the small extent of the region where most of the heat release occurs as found in our previous research. Based on the visualization experiments, we tested RDCs with shorter chamber walls of 40 and 20 mm. The detonation wave was also observed in the shorter chambers, and its velocity was not affected by the difference in chamber length. Thrust performance was also maintained compared to the longer chamber, and the short cylindrical RDC had the same specific impulse tendency as the cylindrical (hollow) or annular 70-mm chamber RDC. Finally, we calculated the pressure distributions of various chamber lengths, and found they were also consistent with the measured pressure at the bottom and exit. We concluded that the short-chamber cylindrical RDC with equal length and diameter maintained thrust performance similar to the longer annular RDC, further expanding the potential of compact RDCs.