关键词: 连续旋转爆轰燃烧室；轴向尺寸；周向尺寸；增压特性；数值研究

Abstract: Based on two-dimensional compressible Euler equations，the rotating detonation flow field with stoichiometric hydrogen-air mixture is investigated numerically and the effects of geometry size of continuously rotating detonation combustor (CRDC) on pressure amplifying characteristic are analyzed. The results show that the flow field parameters present periodic oscillation with constant amplitudes at the quasi-steady-state. Total pressure fluctuates twice along x axis at the rear of detonation wave because of transverse waves and local explosion waves. Length of oblique shock wave and detonation strength play the important roles in pressure amplifying characteristic. It can be enhanced by decreasing axial size or increasing azimuthal size. Calculated pressure-amplifying ratio at CRDC is as high as 2.52，which implies a higher potential power of gas at the exit of CRDC than that in traditional combustors.

Key words: Continuous rotating detonation combustor；Axial size；Azimuthal size；Pressure amplifying characteristic；Numerical investigation