Effect of Vertically-arranged Strut on the Mixing and Initiation Characteristics of Oblique Detonation Engine

doi:10.12382/bgxb.2023.1076

Abstract

Abstract:

The oblique-detonation engine is a new type of air-breathing engine that has great advantages in hypersonic flight above Mach 9. The oblique detonation engine with inner-jet configuration faces the problem of inhomogeneous fuel mixing due to the short mixing distance, and the inhomogeneous fuel distribution affects the stable and reliable detonation of detonation wave. A vertically-arranged strut is proposed for the efficient and low-resistance mixing of fuel. The superiority of vertically-arranged strut in achieving the stable detonation of oblique detonation waves is studied through numerical simulation, and the influence of the injection angle of vertically-arranged strut on the fuel mixing and detonation is analyzed. The results show that the hydrogen mass fraction at the outlet of the mixing section reduces with the increase in the injection angle of vertically-arranged strut, leading to the bending of hydrogen distribution structure. At the same time, the detonation area is tilted, and the detonation distance increases slightly and then gradually decreases. It can be seen that the increase in the injection angle of vertically-arranged strut strengthens the hydrogen doping and reduces the detonation distance, thus achieving stable and reliable detonation of oblique detonation waves.

Key words: oblique detonation engine, vertically-arranged strut, mixing section, initiation section, strut angle

CLC Number:

V231.22

LIU Yidong, QIN Qiongyao, LI Jianzhong, YUAN Mingze, LI Longgang, LI Xiafei. Effect of Vertically-arranged Strut on the Mixing and Initiation Characteristics of Oblique Detonation Engine[J]. Acta Armamentarii, 2024, 45(12): 4462-4474.

Figures/Tables 19

Fig.1 Schematic diagrams of oblique detonation engines with two different injection configurations

Fig.2 Simulation area: the mixing section (Region 1) and the detonation section (Region 2)

Fig.3 Mixing section models of horizontally-and verticaly-arrangedl strut injections

Table 1 Boundary conditions of mixing section

位置	马赫数	温度	压力	氧气质量分数	氮气质量分数	水质量分数	氢气质量分数
燃烧室进口	4.2	857.7	61004	0.232	0.736	0.032	0
燃料喷注器	1.01	300	225000	0	0	0	1

Fig.4 3D model and grid model of detonation section

Fig.5 Pressure contours of detonation section with different grid accuracies

Fig.6 Variation curves of temperature and OH density near the wall under different grid accuracies

Fig.7 Schematic diagram of two-dimensional ideal oblique detonation wave

Fig.8 Temperature contours at the exit section of the detonation section under horizontally-and vertical-arranged strut injections

Table 2 Mixing conditions at the different angles vertical-arranged strut

工况	垂直支板角度/(°)	工况	垂直支板角度/(°)
1	4	3	8
2	6	4	10

Fig.9 Hydrogen contours and flow field structures under different arranging angles of vertically-arranged strut

Fig.10 Hydrogen mass fraction at the outlet of mixing sectionunder different arranging angles of vertically-arranged strut

Fig.11 Variation curves of pressures and temperatures at each positions of the mixing section with different vertically-arranged strut injection angles

Table 3 Detonation section exit pressure and temperature contours under different angles of vertically-arranged strut injection

Table 4 z-axis position corresponding to the shortest cross-section of detonation distance

支板角度/(°)	4	6	8	10
z/m	0.012	0.012	0.011	0.0105

Table 5 Pressure and temperature profiles of the cross-section of detonation section at the shortest detonation distance

Fig.12 Temperature contour map of detonation section under different angles of vertically-arranged strut

Fig.13 Emperature contour surface map of detonation wave front under different angles of vertically-arranged strut

Fig.14 The detonation temperature contour corresponding to detonation wave front and the variation curve of detonation distance under different angles of vertically-arranged strut

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