Influence of Combustor Configuration on Rotating Detonation Characteristics of Kerosene Pre-combustion Cracking Gas

doi:10.12382/bgxb.2023.0491

Abstract

Abstract:

The width and outlet blockage ratio of rotating detonation combustion chamber are changed under the condition of fixed incoming flow. The effect of combustor configuration on the rotating detonation characteristics of kerosene pre-combustion cracking gas and air was experimentally investigated. The experimental results show that suitable combustor width and outlet width can promote stable self-sustaining propagation of rotating detonation wave (RDW). When the width of combustor is 20mm or 26mm and the width of combustor outlet is 4~8mm, the kerosene pre-combustion cracking gas and air can be successfully detonated and can propagate stably. The propagation velocity and stability of RDW are improved by increasing the width of combustor. With the increase in outlet blockage ratio, the RDW propagation mode experiences stable single rotating detonation wave (SRDW) mode, intermittent single rotating detonation wave (ISRDW) mode and two-co rotating detonation waves (TCORDW) mode. The blockage ratio can be increased to improve the intensity of reflected shock wave at the end of combustor and promote the generation of multiple wave heads. RDW propagation velocity and pressure increase first and then decrease with the increase in blockage ratio.

Key words: kerosene pre-combustion cracking gas, rotating detonation, combustor configuration, propagation mode

CLC Number:

TJ301

HAN Jiaxiang, BAI Qiaodong, QIU Han, ZHENG Quan, WENG Chunsheng. Influence of Combustor Configuration on Rotating Detonation Characteristics of Kerosene Pre-combustion Cracking Gas[J]. Acta Armamentarii, 2024, 45(8): 2837-2850.

Figures/Tables 23

Fig.1 Kerosene pre-combustion cracking gas/air rotating detonation experiment system

Fig.2 Experimental device

Fig.3 Combustor configuration

Fig.4 Installation position of high frequency dynamic pressure sensor

Fig.5 P1~P6 static pressure curves in experimental process

Fig.6 Temperature curve of kerosene pre-combustion cracking gas collecting chamber

Table 1 Experimental results under different combustor configurations

工况	燃烧室宽度/mm	出口宽度/mm	阻塞比	传播主频/ Hz	波速/ (m·s^-1)	传播模态
1	8	8	0			失败
2	14	8	0.39			失败
3	14	14	0			失败
4	20	4	0.76	5791±44	1000.6±15.2	TCORDW
5	20	6	0.65	3095±36	1069.6±12.4	ISRDW
6	20	8	0.55	3090±50	1067.8±17.3	SRDW
7	20	14	0.25			失败
8	20	20	0			失败
9	26	4	0.81	6363±17	1099.5±5.9	TCORDW
10	26	6	0.71	3421±42	1182.2±14.5	ISRDW
11	26	8	0.63	3358±40	1160.4±13.8	SRDW
12	26	14	0.38			失败
13	26	20	0.18			失败
14	26	26	0			失败

Fig.7 PCB1 high frequency dynamic pressure curve

Fig.8 Analysis diagram of detonation wave frequency domain

Table 2 Kerosene pre-combustion cracking gas component

主要组分	CH₄	C₂H₆	H₂	C
质量分数	0.45207	0.00004	0.0117	0.47763

Fig.9 High frequency dynamic pressure of SRDW mode

Fig.10 High frequency dynamic pressure of ISRDW mode

Fig.11 Analysis diagram of detonation wave frequency domain of ISRDW mode

Fig.12 TCRDW mode

Fig.13 SRDW mode

Fig.14 Mode transition from TCRDW to SRDW

Fig.15 High frequency dynamic pressure of TCORDW mode

Fig.16 Analysis diagram of detonation wave frequency domain of TCORDW mode

Fig.17 TCORDW mode

Fig.18 RDC static pressure

Fig.19 Variation of RDW wave velocity with the outlet width of combustor

Table 3 RDW propagation pressure and stability

燃烧室出口宽度/mm	燃烧室宽度/ mm	平均压力/ MPa	变异系数
4	20	0.17±0.05	0.30
	26	0.30±0.06	0.19
6	20	0.65±0.16	0.25
	26	0.56±0.10	0.19
8	20	0.5±0.11	0.22
	26	0.38±0.06	0.17

Fig.20 RDW propagation pressure and stability analysis

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