Effect of tail flare of integral support plate on double-wall cooling performance

The tail of the integrated support plate replaces the traditional flame holder to stabilize the flame. To prevent the support plate from being ablated by high-temperature flame, a double-wall cooling structure is set at its tail, and cold air is introduced to cool it. However, the cold air reduces the stability of the flame. To improve the flame stability of the integrated support plate, the rear of the support plate is expanded. The effects of expansion angle on the aerodynamic characteristics of the afterburner and cooling performance of the double-wall are investigated by using the experimentally verified CFD method. The results show that the total pressure recovery factor of the integral afterburner decreases with the increase of the flare angle under the condition of non-afterburning; the flame stability is improved by increasing the flare angle within a certain range; the film covering effect at the upper part of the flame stabilizer gets worse as the flare angle increases, and the overall cooling effect of the double-wall gets worse.