超燃冲压发动机中不同燃烧模态下乙烯燃烧释热的敏感因素

doi:10.7527/S1000-6893.2024.30944

Abstract

Abstract:

An experimental study is conducted to investigate the sensitive factors affecting ethylene combustion heat release in a scramjet combustion under supersonic flow conditions with of Mach number 2.52， total pressure 1.34 MPa and total temperature 1 650 K. The effects of key configuration parameters such as the isolator length， injection distance， cavity depth， and throat size on the ethylene combustion heat release are systematically analyzed and compared. The results show that the sensitivity of ethylene combustion heat release to configuration parameters is closely related to the combustion mode. When the combustion is in the completely scramjet mode， the combustion heat release is insensitive to changes in configuration parameters， while the opposite is true when the combustion is in the dual-mode scramjet operation （scramjet mode）. Later， as the equivalence ratio increases， the combustion gradually transitions to the dual-mode ramjet operation （ramjet mode）， and the sensitivity of the heat release to changes in configuration parameters gradually decreases. Overall， the order of the influence of different configuration parameters on combustion heat release from high to low is as follows： throat size > isolator length > injection distance > cavity depth.

Key words: scramjet, cavity, supersonic flow, combustion heat release, combustion mode

CLC Number:

V235.21

Fan LI, Mingjiang LIU, Mingbo SUN, Guoyan ZHAO, Guangwei MA, Chenxiang ZHAO. Sensitive factors of ethylene combustion heat release under different combustion modes in scramjet engine[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(4): 130944.

Figures/Tables 19

Fig.1

Table 1

Detailed inflow conditions

参数	数值
马赫数Ma	2.52
总温 $T 0$ /K	1 650
总压 $P 0$ /MPa	1.34
O₂质量分数 $Y O 2$ /%	23.38
H₂O质量分数 $Y H 2 O$ /%	6.22
CO₂质量分数 $Y C O 2$ /%	10.16
N₂质量分数 $Y N 2$ /%	60.24

Table 1

Fig.2

Table 2

Table 3

Fig.3

Fig.4

Fig.5

Fig.6

Table 4

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

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参数	数值	参数	数值
L₁	560	L_c	70
L₂	140	D_c	21
L₃	490	H_c	21
W	50	d₁	42
H₁	35	d₂	21
H₂	42	d₃	14

当量比	喷注总压/MPa	乙烯流量/（g·s^-1）	喷注模块
0	0	0
0.13	1.30	6.1	J1/J2
0.15	1.63	6.8	J1/J2
0.19	2.35	8.9	J1/J2
0.27	3.63	12.6	J1/J2
0.35	2.24	16.3	J2、J3
0.41	2.72	19.1	J2、J3

构型参数	参数变化	实验当量比
隔离段长度	L₁=560 mm→280 mm	0.13、0.19、0.27
喷注距离	d₂=21 mm→d₁=42 mm	0.13、0.19、0.27
凹腔深度	D_c=21 mm→10 mm	0.13、0.19、0.27、0.35、0.41
喉部大小	H_c=21 mm→16.8 mm，对应H=35 mm→39.2 mm	0.13、0.19、0.27、0.35、0.41

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Sensitive factors of ethylene combustion heat release under different combustion modes in scramjet engine

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