Influence of injector structure details on mixing characteristics of continuous detonation engine
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摘要:
为研究不同喷嘴结构细节对气氢/气氧连续爆轰发动机冷态掺混特性的影响，采用商业软件Fluent对其冷态掺混流场进行了数值仿真研究。以环缝-喷孔式喷注结构为基础，设计了12种不同喷嘴结构的连续爆轰发动机，研究了在入口条件相同的情况下，不同气氧喷嘴出口扩张角、不同气氢喷注角度、不同气氢喷嘴出口扩张角以及单双侧喷注对掺混特性的影响。结果表明：气氧喷嘴出口扩张角在0°～20°范围内，掺混效果呈现先下降后上升的趋势，气氧喷嘴出口扩张角最佳值为20°；气氢喷注角度在30°～90°范围内，掺混效果呈现先上升后下降的趋势，气氢喷注角度最佳值为45°；在0°～10°范围内，增大气氢喷嘴出口扩张角使得掺混效果下降；气氢双侧喷注的掺混效果明显优于单侧喷注。
Abstract:In order to study the influence of different injector structure details on the cold mixing characteristics of GH2/GO2 continuous detonation engine, the cold flow field of GH2/GO2 continuous detonation engine was numerically simulated with commercial software Fluent. Based on the annular-hole injector structure, 12 different engines with different injector structures were designed. The influences of different oxygen injector outlet expansion angles, different hydrogen injection angles, different hydrogen injector outlet expansion angles, and unilateral injection on the mixing characteristics were studied under the same inlet conditions. The results showed that the mixing effect decreased first and then increased when the expansion angle of oxygen injector outlet was within the range of 0°−20°, and the optimum expansion angle was 20°. When the hydrogen injection angle was within the range of 30°−90°, the mixing effect increased first and then decreased, and the optimal injection angle was 45°. Within the range of 0°−10°, increasing the expansion angle of the hydrogen injector outlet reduced the mixing effect. The mixing effect of gas-hydrogen bilateral injection was obviously better than that of unilateral injection.
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图 5 不同气氧喷嘴出口扩张角的中心截面上马赫数云图与流线图
Figure 5. Mach number and streamline diagram on the central cross section of different GO2 injector outlet expansion angles
图 6 不同气氧喷嘴出口扩张角的中心截面上H2质量分数分布云图
Figure 6. Mass fraction of H2 on the central cross section of different GO2 injector outlet expansion angles
图 7 不同气氧喷嘴出口扩张角的H2质量分数离散系数（β=45°，γ=0°）
Figure 7. H2 mass fraction dispersion coefficients of different GO2 injector outlet expansion angles （β=45°，γ=0°）
图 8 不同气氢喷注角度的中心截面上马赫数云图与流线图
Figure 8. Mach number and streamline diagram on the central cross section of different GH2 injection angles
图 9 不同气氢喷注角度的中心截面上H2质量分数分布云图
Figure 9. Mass fraction of H2 on the central cross section of different GH2 injection angles
图 10 不同气氢喷注角度的H2质量分数离散系数（α=45°，γ=0°）
Figure 10. H2 mass fraction dispersion coefficients at different GH2 injection angles （α=45°，γ=0°）
图 11 不同气氢喷嘴出口扩张角的中心截面上马赫数云图与流线图
Figure 11. Mach number and streamline diagram on the central cross section of different GH2 injector outlet expansion angles
图 12 不同气氢喷嘴出口扩张角的中心截面上H2质量分数分布云图
Figure 12. Mass fraction of H2 on the central cross section of different GH2 injector outlet expansion angles
图 13 不同气氢喷嘴出口扩张角的H2质量分数离散系数 （α=20°，β=45°）
Figure 13. H2 mass fraction dispersion coefficients at different GH2 injector outlet expansion angles （α=20°，β=45°）
图 14 气氢单侧喷注与双侧喷注的中心截面上马赫数云图与流线图（α=20°，β=45°，γ=0°）
Figure 14. Mach number and streamline diagram on central cross section of unilateral and bilateral GH2 injection （α=20°，β=45°，γ=0°）
图 15 气氢单侧喷注与双侧喷注时的H2质量分数离散系数（α=20°，β=45°，γ=0°）
Figure 15. H2 mass fraction dispersion coefficients between unilateral and bilateral GH2 injection （α=20°，β=45°，γ=0°）
表 1 不同发动机喷注器结构尺寸
Table 1. Structure dimension of different engine injectors
编号 α/（°） β/（°） γ/（°） 喷注方式 1 0 45 0 双侧 2 5 45 0 双侧 3 10 45 0 双侧 4 15 45 0 双侧 5 20 45 0 双侧 6 20 30 0 双侧 7 20 60 0 双侧 8 20 90 0 双侧 9 20 45 5 双侧 10 20 45 10 双侧 11 20 45 0 外侧 12 20 45 0 内侧 
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