氢氧旋转爆震传播特性研究

Propagation Characteristics of Hydrogen/Oxygen Rotating Detonation

关键词:  旋转爆震  氢气/氧气  非预混进气  爆燃  多波模态

Key words:  Rotating detonation  Hydrogen/oxygen  Non-premixed injection  Deflagration  Multi-wave mode

摘要:

为揭示基于氢氧推进剂的旋转爆震火箭发动机的应用潜力，在环形燃烧室内开展了氢气/氧气旋转爆震试验，并基于OpenFOAM代码进行了三维非预混高保真数值仿真工作。试验研究表明，燃烧室内存在6个以上同向旋转爆震波，频率约为36.6kHz。同等工况的仿真结果显示，爆震波经过一系列对撞调整过程后演化为7个同向传播的爆震波，波头高度约7mm。稳定阶段的平均频率为45.7kHz，传播速度为Chapman-Jouguet爆震速度的87%。传播过程中爆震波保持着波阵面、接触面、滑移线等典型结构。然而，新鲜混气在接触面发生了显著爆燃，这可能导致氢氧旋转爆震发动机的性能损失。

Abstract:

The paper presents a rotating detonation experiment powered by hydrogen/oxygen in an annular combustor to reveal the potential of the hydrogen/oxygen propellant-based rotating detonation rocket engine. Further， a three-dimensional non-premixed high-fidelity numerical simulation was conducted based on OpenFOAM code. The experimental results show more than six co-rotating detonation waves in the combustion chamber， and the frequency is about 36.6kHz. The numerical results under the same working condition show seven detonation waves propagating in the same direction， and the waves’ height is about 7mm. The average frequency in the stable stage is 45.7kHz， and the propagation speed is 87% of the Chapman-Jouguet detonation speed. Moreover， it finds that the detonation waves maintain the typical structures such as wavefront， contact surface， and slip line. However， the fresh mixture has deflagrated severely on the contact surface， which may result in a performance deficit of hydrogen/oxygen rotating detonation engines.