Investigation of combustion modes and pressure of reflective shuttling detonation combustor
Investigation of combustion modes and pressure of reflective shuttling detonation combustor
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反射式穿梭爆轰燃烧室燃烧方式及压力研究
DOI：
10.1016/j.proci.2020.07.064
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发表时间：
2021
影响因子：
3.4
通讯作者：
Matsuo Akiko
中科院分区：
文献类型：
--
作者：
Yamaguchi Masato;Taguchi Tomoya;Matsuoka Ken;Kawasaki Akira;Kasahara Jiro;Watanabe Hiroaki;Matsuo Akiko
爆轰燃烧器被认为是传统燃烧器的有前途的替代品，因为它们提供高的热效率和快速燃烧。然而，特别是对于旋转爆震燃烧室，由于高度非定常的流场阻碍了测量过程，理论推进性能在实验研究中尚未得到证实。为了更深入地了解这些现象，设计了一个矩形燃烧室的反射式穿梭爆震燃烧室。由于其二维质量，腔室的内部可以很容易地可视化。利用RSDC，几个燃烧试验与气态乙烯和氧气进行了不同的质量流量和当量比的值。利用高速摄像机和带通滤波器拍摄的CH ~* 自发光图像，通过快速傅里叶变换（FFT）分析，将燃烧模式分为4种类型。同时，传统等压燃烧室的理论总压与RSDC燃烧室底部测得的静压进行了比较。对于爆轰模式，实验测量的静压和理论压力之间的比率变化取决于在室内的位置，由于时间平均静压的分布。此外，爆轰模式的压力比是高达18%，低于爆燃模式可能是由于由爆轰波诱导的流速。
Detonation combustors are considered promising alternatives to conventional combustors because they offer high thermal efficiency and fast combustion. However, especially for the rotating detonation combustor, the theoretical propulsive performance has not been confirmed in experimental studies because the highly unsteady flow field hinders the measurements process. To understand the involved phenomena in more detail, a reflective shuttling detonation combustor (RSDC) with a rectangular combustion chamber was developed. The interior of the chamber can easily be visualized owing to its two-dimensional quality. Utilizing the RSDC, several combustion tests with gaseous ethylene and oxygen were conducted for different values of mass flow rates and equivalence ratios. Combustion modes from the tests were classified into four types based on the fast Fourier transform (FFT) analysis of the luminous intensity of the CH* self-luminescence images captured by a high-speed camera and a band pass filter. Simultaneously, the theoretical total pressure of a conventional isobaric combustor was compared to the static pressure measured at the bottom of the RSDC chamber. For the detonation modes, the ratio between experimentally measured static pressure and the theoretical pressure varied depending on the location in the chamber owing to the distribution of the time-averaged static pressure. Furthermore, the pressure ratio of the detonation modes was up to 18% lower than that of the deflagration mode potentially owing to the flow velocity induced by the detonation waves.