人为粗糙度强化换热机理分析及效果评估

The Mechanism and Effect of Artificial Roughness on Heat Transfer Enhancement

对推力室冷却通道内的人为粗糙度强化换热机理进行了分析,讨论了影响人为粗糙度强化换热的因素。对有、无人为粗糙度的平直冷却通道内流动进行了对比数值模拟,并以某特定发动机推力室为例,初步评估了人为粗糙度的强化换热效果。计算和分析表明:在推力室喉部附近设置人为粗糙度,可使推力室气壁温平均下降约43℃,在冷却通道内合理地设置人为粗糙度有利于高室压可重复使用发动机推力室的热防护。

The mechanism and influence factors of artificial roughness (AR) on enhanced heat transfer in chamber cooling channels have been analyzed. The numerical simulation results of straight cooling channels with or without AR are compared. As an example, the effects of AR on the heat transfer improvement of a specific thrust chamber have also been estimated. It is shown that the average wall temperature of the gas-side drops about 43℃ with AR in the throat area. Therefore, the reasonable use of AR could gain the benefit of heat protection for high pressure reusable engine thrust chambers.