Supersonic Combustion Mode Analysis of a Cavity Based Scramjet

被引：9

作者：

Meng, Yu ^{[1
,2
]}

Sun, Wenming ^{[2
]}

Gu, Hongbin ^{[2
]}

Chen, Fang ^{[1
]}

Zhou, Ruixu ^{[2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Aeronaut & Astronaut, Shanghai 200240, Peoples R China

[2] Inst Mech CAS, Beijing 100190, Peoples R China

来源：

AEROSPACE | 2022年 / 9卷 / 12期

基金：

中国国家自然科学基金;

关键词：

scramjet; combustion mode; POD; instability; FLAME STABILIZATION; TRANSITION; DYNAMICS;

D O I：

10.3390/aerospace9120826

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

Since flame stability is the key to the performance of scramjets, scramjet combustion mode and instability characteristics were investigated by using the POD method based on a cavity-stabilized scramjet. Experiments were developed on a directly connected scramjet model that had an inlet flow of Mach 2.5 with a cavity stabilizer. CH* chemiluminescence, schlieren, and a wall static pressure sensor were employed to observe flow and combustion behavior. Three typical combustion modes were classified by distinguishing averaged CH* chemiluminescence images of three ethylene fuel jet equivalence ratios. The formation reason was explained using schlieren images and pressure characteristics. POD modes (PDMs) were determined using the proper orthogonal decomposition (POD) of sequential flame CH* chemiluminescence images. The PSD (power spectral density) of the PDM spectra showed large peaks in a frequency range of 100-600 Hz for three typical stabilized combustion modes. The results provide oscillation characteristics of three scramjet combustion modes.

引用

页数：11

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