Numerical Study for Effects of Cooling Air Jet on Flow Characteristics and Temperature Distribution of Wall Flameholder

To meet the requirements of advanced afterburner for the reliability of pilot flameholder, an air-cooled wall flameholder was designed, and numerical simulation method was employed to investigate the flow field characteristics and wall temperature distribution under different angles of cooling holes. Results show that the flow separation at the corner of air-cooled wall flameholder in bypass can be suppressed; hence, it could be prevented that the high-temperature gas flows back into the bypass through the cooling holes. Different flow field structures can be obtained by adjusting the angle of cooling holes α and β on the front and latter plate of flameholder. When α or β is greater than 90°, a clockwise rotating vortex appears in the cavity, and the main recirculation zone becomes smaller. At α=30° and β=30°, the flow field is slightly affected by the air-cooled structure, and it changes obviously as α or β increases. At α=90° and β=150°, the wall flameholder has a better cooling effect. © 2022, Editorial Department of Journal of Propulsion Technology. All right reserved.