某型发动机高空、低速下燃烧室冷却性能分析

通过对某型发动机燃烧室火焰筒在高空、低速条件下的流量分配、沿程参数和壁温分布计算，对该型发动机燃烧室的冷却性能进行分析研究。结果表明：在高空条件下，火焰筒同一轴向位置的壁温随马赫数的增大而升高；气膜冷却有一定的冷却保护有效长度，使得火焰筒壁温沿轴向分布呈锯齿形。

Analysis of Engine Combustion Chambers for Cooling Performance under the Conditions of High Altitude and Low Velocity

Through the calculation of the flow rate distribution, wayside parameter and wall temperature distribution of engine flame tube under the conditions of high altitude and low velocity, the cooling characteristic of the engine combustion chamber is analyzed and investigated. The results show that, under the conditions of high altitude, the flame tube wall temperature of the same axial position is increased with the increase of Mach number; and the film cooling has a finite effective length of cooling protection, which makes the flame tube wall temperature distribute axially in a saw-tooth curve.