Effect of Oxygen Content on the Propagation Characteristics of Liquid Kerosene Rotating Detonation Wave in Hollow Combustor

doi:10.12382/bgxb.2024.0499

Abstract

Abstract:

The rotating detonation engine,as a highly promising aerospace propulsion system,is currently a research hotspot and frontier in the field of aerospace propulsion.The effect of oxygen content on the propagation characteristics of rotating detonation waves of liquid kerosene in a hollow combustor is investigated experimentally by varying the oxygen content of the oxygen-enriched air and the equivalence ratio.The experiment is conducted based on the research on the annular combustor in Ref.[15].The oxygen content required for the stable propagation of liquid kerosene-oxygen-enriched air rotating detonation wave in the hollow combustor under ambient temperature condition is successfully decreased to 0.28.The rotating detonation wave propagates in single mode under different oxygen contents and equivalence ratios during the experiment.When the equivalence ratio is approximately 1,the average velocity of detonation wave increases with the increase in the oxygen content in the oxygen-enriched air.For the oxygen content of 0.28,the average propagation velocity of rotating detonation wave is 1 742.7m/s.The propagation velocity of detonation wave is lower than the theoretical velocity under the condition of lower oxygen content,while the detonation wave is over-driven under the condition of higher oxygen content (0.34-0.43).The oxygen content has a significant impact on the stability of detonation wave. The stability of detonation wave is poor with an oxygen content of 0.28 when the equivalence ratio increases to 1.31,while the detonation wave still maintains a high level of stability with an oxygen content of 0.38 when the equivalent ratio is 1.35.

Key words: liquid kerosene, rotating detonation, hollow combustor, oxygen content, propagation characteristic

CLC Number:

V231.22

LI Lele, HAN Xinpei, XIAO Qiang, BAI Qiaodong, ZHENG Quan, WENG Chunsheng. Effect of Oxygen Content on the Propagation Characteristics of Liquid Kerosene Rotating Detonation Wave in Hollow Combustor[J]. Acta Armamentarii, 2025, 46(6): 240499-.

Figures/Tables 21

Fig.1 Schematic diagram of test system

Fig.2 Schematic diagram of mixing section

Fig.3 Layout of pressure sensors

Fig.4 Time sequence

Table 1 Experimental parameters

Case	煤油/ (g·s^-1)	空气流量/ (g·s^-1)	氧气流量/ (g·s^-1)	氧含量	当量比	波速/ (m·s^-1)	传播模态
1	82.8	487.8	168.4	0.43	1.00	2036.6	单波
2	44.0	489.7	121.0	0.38	0.64	1668.3	单波
3	56.3	489.3	120.3	0.38	0.82	1903.3	单波
4	62.4	489.8	120.2	0.38	0.91	1954.7	单波
5	71.1	490.3	120.3	0.38	1.04	1999.4	单波
6	82.5	489.3	119.1	0.38	1.21	2036.1	单波
7	91.8	489.2	118.7	0.38	1.35	2055.4	单波
8	60.9	484.0	94.2	0.36	1.01	1960.3	单波
9	57.9	487.5	82.8	0.34	1.01	1931.1	单波
10	49.7	487.2	50.3	0.30	1.04	1849.6	单波
11	42.0	487.1	32.7	0.28	0.99	1742.7	单波
12	49.0	487.0	33.2	0.28	1.15	1839.7	单波
13	55.8	486.0	36.8	0.28	1.28	1860.0	单波
14	55.9	487.3	32.6	0.28	1.31	1818.5	单波
15	62.0	490.0	32.8	0.28	1.45	1771.0	单波
16	64.9	488.2	32.6	0.28	1.52

Fig.5 Pressure signal of PCB2 in Case 11

Fig.6 Static pressure curves of p1 and p8

Fig.7 Pressure signal of PCB2 in Case 1

Fig.8 Pressure curves of PCB1,PCB2 and PCB3 in the ignition process

Fig.9 Pressure peak intervals of PCB

Fig.10 Change of tDDT with oxygen content

Fig.11 Change of wave velocity with oxygen content

Fig.12 Cahnge of detonation wave pressure with oxygen content

Fig.13 Pressure signal in Case 5

Fig.14 Pressure peaks and wave velocity in Case 5

Fig.15 High-speed photography in Case 5

Fig.16 Analysis graphics of pressure signal frequency domain in Case 11

Fig.17 Pressure peaks and wave velocity in Case 11

Fig.18 Change of wave velocity with equivalence ratio

Fig.19 Pressure signal in Case 16

Fig.20 Relative standard deviation of detonation wave velocity at different equivalence ratios

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