蒸发孔角度对蒸发式稳定器壁温影响规律仿真及验证

Simulation and Verification of the Influence of Evaporation Hole Angle on EvaporativeFlameholder Wall Temperature

中文关键词:  蒸发式火焰稳定器  蒸发孔角度  壁温  流固耦合  整机试验验证  航空发动机

英文关键词:evaporative flameholder  evaporation hole angle  wall temperature  fluid-structure interaction  whole engine test verifica⁃ tion  aeroengine

中文摘要:

      为了研究在不同蒸发孔角度下蒸发式稳定器壁温分布，在蒸发式稳定器工作载荷复杂、工作环境恶劣等条件下，以发动 机加力燃烧室稳定器工作参数、几何构型为基础，采用大涡湍流模型、考虑气-固-热耦合的稳定器气动传热数值仿真方法，开展了 蒸发孔角度对蒸发式稳定器壁温影响规律计算分析，并进行整机台架测温验证。结果表明：蒸发孔角度对加力燃烧室总压恢复系 数和燃烧效率影响较小，对稳定器壁温影响较明显。当蒸发孔角度由100°减小至60°时，稳定器最高壁温降低80 K；当蒸发孔角度 由100°增大至120°时，稳定器最高壁温降低60 K。蒸发孔角度由100°调整为60°后稳定器壁温降温的数值仿真结果约为110 K， 整机上测温结果约为122 K，降温明显，可有效地提升稳定器使用寿命。

英文摘要:

      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.