| Abstract:In order to study the wall temperature distribution of an evaporative flameholder at different evaporation hole angles, based
on the working parameters and geometric configuration of the areoengine afterburner, under complex working loads and harsh working
environment of the evaporative flameholder, by using a numerical method for aerodynamic heat transfer simulation of the flameholder adopt?
ing the large eddy turbulence model and considering gas-solid-thermal coupling, the influence of evaporation hole angle on evaporative
flameholder wall temperature was investigated and analyzed, and verified by temperature measurements during whole engine tests. The
results show that the evaporation hole angle of the evaporative flameholder has little effect on the total pressure recovery coefficient and
combustion efficiency of the afterburner, but has a significant effect on the wall temperature of the flameholder; when the evaporation hole
angle decreases from 100° to 60°, the maximum wall temperature of the flameholder decreases by 80 K; when the evaporation hole angle
increases from 100° to 120°, the maximum wall temperature of the flameholder decreases by 60 K. After the evaporation hole angle is
adjusted from 100° to 60°, the numerical simulation result of the wall temperature drop of the flameholder is about 110 K, and the engine
test result is about 122 K. The temperature drop is significant, which can effectively improve the service life of the flame holder. |
