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Effect of Vertically-arranged Strut on the Mixing and Initiation Characteristics of Oblique Detonation Engine
LIUYidong, QINQiongyao, LIJianzhong, YUANMingze, LILonggang, LIXiafei
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Sponsored by: China Association for Science and Technology (CAST)
Editor-In-Chief: Xu Yida
ISSN 1000-1093
Hosted By: China Ordnance Society
Published By: Acta Armamentarii
CN 11-2176/TJ
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Effect of Vertically-arranged Strut on the Mixing and Initiation Characteristics of Oblique Detonation Engine
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.
oblique detonation engine / vertically-arranged strut / mixing section / initiation section / strut angle {{custom_keyword}} /
Table 1 Boundary conditions of mixing section表1 掺混段边界参数 |
| 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.5 Pressure contours of detonation section with different grid accuracies图5 不同网格精度下起爆段压力等值线图 |
Table 2 Mixing conditions at the different angles vertical-arranged strut表2 不同垂直支板角度工况 |
| 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.10 Hydrogen mass fraction at the outlet of mixing sectionunder different arranging angles of vertically-arranged strut图10 不同垂直支板角度掺混段出口氢气质量分数云图 |
Table 3 Detonation section exit pressure and temperature contours under different angles of vertically-arranged strut injection表3 不同垂直支板角度下起爆段出口压力和温度分布云图 |
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Table 4 z-axis position corresponding to the shortest cross-section of detonation distance表4 起爆距离最短截面相对应的z轴位置 |
| 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表5 起爆距离最短位置截面压力和温度云图 |
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PDF(12885 KB)
Fig.1 Schematic diagrams of oblique detonation engines with two different injection configurationsFig.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 sectionFig.4 3D model and grid model of detonation sectionFig.5 Pressure contours of detonation section with different grid accuraciesFig.6 Variation curves of temperature and OH density near the wall under different grid accuraciesFig.7 Schematic diagram of two-dimensional ideal oblique detonation waveFig.8 Temperature contours at the exit section of the detonation section under horizontally-and vertical-arranged strut injectionsTable 2 Mixing conditions at the different angles vertical-arranged strutFig.9 Hydrogen contours and flow field structures under different arranging angles of vertically-arranged strutFig.10 Hydrogen mass fraction at the outlet of mixing sectionunder different arranging angles of vertically-arranged strutFig.11 Variation curves of pressures and temperatures at each positions of the mixing section with different vertically-arranged strut injection anglesTable 3 Detonation section exit pressure and temperature contours under different angles of vertically-arranged strut injectionTable 4 z-axis position corresponding to the shortest cross-section of detonation distanceTable 5 Pressure and temperature profiles of the cross-section of detonation section at the shortest detonation distanceFig.12 Temperature contour map of detonation section under different angles of vertically-arranged strutFig.13 Emperature contour surface map of detonation wave front under different angles of vertically-arranged strutFig.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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