轴承腔典型结构热防护性能模型实验研究

The thermal insulation performance experiment of the model test piece was carried out to study the typical thermal protection structure with thermal insulation interlayer for the bearing chamber of aero-engine. A special test platform was built to measure the thermal insulation performance of different thermal protection structures at typical working temperatures. The steady-state method was used to conduct research on the equivalent thermal conductivity of the corresponding structures. The results show that increasing the thickness of the aerogel material can rapidly improve the overall thermal resistance of the structure. The thermal insulation performance of the air interlayer is equivalent to that of the aerogel under the same thickness. After adding a reflective screen to 1/3 of the thermal insulation interlayer，the thermal insulation temperature difference can be increased by 20.4%. Due to the influence of the‘thermal short-circuit’effect of installation，the thermal conductivity of the typical combined thermal insulation test piece is at least 0.58W/ （m·K），which is significantly larger than that of the single thermal insulation material.