Numerical simulation on detonation chamber wall temperature distribution of a multi-cycle pulse detonation engine model

The heat transfer characteristics of the detonation chamber's outer and inner wall were analyzed when the pulse detonation engine model was operated in the multi-cycle mode. A model was established to calculate the detonation chamber's wall temperature distribution. By using of the ANSYS/transient thermal analysis module, the time histories of detonation chamber's outer/inner wall temperature were numerical simulated in different detonation frequencies and locations. It was found that the outor wall temperature increases continuously along with the operation time, which the inner wall temperature increases oscillating at the same time, but the increasing trends of both are the same; There is a thermal equilibrium time. After this time, the temperature of inner and outer wall doesn't increase along with the increase of operation time. The equilibrium time decreases as the engine frequency increase; At the thermal equilibrium time, from head to aft of the detonation chamber, the outer wall temperature takes on a gradually increasing trend. At the same axial location, the equilibrium temperature of the outer wall increases as the detonation frequency increases, but the increasing extent decreases along with the increase of the detonation frequency.