Effects of Inlet Condition Variations on the Operating Modes of Rotating Detonation Engines
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摘要: 采用数值模拟方法分析了来流工况变化对连续旋转爆轰发动机(rotating detonation engine, RDE)工作模态的影响。研究发现, 随着进气总压的下降, 流量将迅速减小, 旋转爆轰波可以首先通过调整波头高度和传播速度来匹配新的工况, 维持稳定传播; 如果进气总压下降幅度较大, 旋转爆轰波只能通过调整流场中波面的数目才能匹配新的工况, 此时RDE将发生自适应性的工作模态转换。研究中验证了稳定阶段旋转爆轰波特征参数(波面数目、传播速度以及波头高度)与燃烧室几何尺寸、工况(流量)之间需要满足的近似匹配关系式, 用于解释RDE的工作模态转换过程及变化规律。Abstract: In this study, the operating modes of the rotating detonation engine (RDE) under various inlet conditions were investigated numerically. It was shown that after the sudden reduction of the inlet total pressure, the resulting decrease of the mass flow rate would require the rotating detonation wave (RDW) to adjust its front height and propagation velocity so that it could maintain self-sustained propagation. However, if the inlet total pressure dropped significantly, the number of RDWs in the flow field would decline to match the new inlet conditions. This would lead to an adaptive mode switching process. The approximate matching relation between the characteristic parameters of the RDWs (wave number, propagation velocity, and front height), the geometry of the combustor, and the inlet conditions (mass flow rate) was verified to explain the operating mode switching process and the underlying mechanisms.
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图 5 来流工况(进气总压)变化情况示意图
Figure 5. Schematic of the variations of operating conditions (inlet total pressure)
图 6 算例A中进气总压下降阶段RDE流场温度云图和新鲜燃料分布(RDE发生工作模态转换)
Figure 6. Temperature contour and fresh reactant distribution during the stage of inlet total pressure drop in case A (Operating mode transition was induced)
图 7 进气总压恢复后重新稳定的RDE流场温度云图和新鲜燃料分布(算例A和A*)
Figure 7. Temperature contour and fresh reactant distribution during the re-stabilization stage of inlet total pressure (case A and A*)
图 8 算例B中RDE流场温度云图和新鲜燃料分布(RDE没有发生工作模态转换)
Figure 8. Temperature contour and fresh reactant distribution in case B (Operating mode transition was not induced)
图 10 RDE进气流量随时间变化趋势
Figure 10. Variations of the inlet mass flow rate with time in the RDE
图 11 算例A/A*工作模态转换前后旋转爆轰波的特征参数与燃烧室尺寸以及工况之间的近似匹配关系式图
Figure 11. Diagram of the matching relation between the characteristic parameters of the rotating detonation waves, the geometry of the combustor, and the operating conditions for case A/A*
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