Flow and combustion characteristics of trapped vortex cavity combined with radial flameholder

In order to improve the comprehensive combustion performance of trapped vortex cavity afterburner and better understand the effect of radial flameholder installation angle on flow and combustion characteristics, numerical and experimental investigation were employed at 5°, 8°, 10°, 15° under different excess air coefficients. The investigations were performed under the bypass temperature 600 K, the core temperature 1000 K, the core pressure 180 kPa, the bypass ration 0.17, and excess air coefficient 1.27—2. Through investigation, the flow filed, exit temperature, total pressure recovery coefficient, wall temperature of trapped vortex cavity (TVC) and radial flameholder were obtained. The results showed that when the angle was 5°, the total pressure recovery coefficient was 0.002—0.006 lower, the exit temperature was 20—40 K higher, the TVC wall temperature was 63—82 K lower, the radial flameholder wall temperature was 60—70 K higher than that at the angle of 10°.