Abstract
The stability of oblique detonation waves and the thermodynamic efficiency of the oblique detonation wave cycles are studied systematically. The stability of oblique detonation waves is investigated with two-dimensional simulations based on the open-source program AMROC (from “Adaptive Mesh Refinement in Object-Oriented C++”). The results show that the oblique detonation waves with a smooth transition are more resistant to upstream disturbances, requiring less time than the abrupt ones to recover their stable state. Subsequently, a theoretical analysis based on the ideal thermodynamic cycle is carried out to investigate the thermodynamic efficiency of the oblique detonation cycles under different inflow conditions. The efficiency loss is introduced to measure the difference in thermodynamic efficiency between the oblique detonation waves and Chapman–Jouguet detonations. In addition, the influence of initial compression, inflow velocity, equivalence ratio, and wedge angle on the efficiency loss are studied. Finally, the optimum working condition is analyzed based on the stability of oblique detonation waves and the thermodynamic efficiency of oblique detonation wave cycles, indicating that the oblique detonation waves in an oblique detonation wave engine should be maintained in the shift area between the abrupt and the smooth transition.
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