高压推力室人为粗糙度煤油强化换热实验

为提高煤油为冷却剂的高压推力室的冷却性能,对再生冷却通道中的人为粗糙度局部强化换热技术进行了电传热实验研究。传热实验以煤油为介质,实验件为不同人为粗糙度结构参数的方形直管,粗糙元高度小于1.0mm,最大实验压力不小于20MPa,最大流速为60m/s。结果表明,带有人为粗糙度的方形直管的换热得到了强化,随着人为粗糙度的高度增加,换热强化明显增加,随着流速增加而趋缓,而流阻的上升加快。与光滑矩形实验件对比,合理设置人为粗糙度可得到2倍的换热强化,流阻增加小于2倍。

Investigation of heat transfer enhancement with artificial roughness for high pressure chamber using kerosene as coolant

The technique of local heat transfer enhancement with artificial roughness(AR) located in regenerative cooling channel was studied by electric heated experimentation for improving the cooling performance of the high pressure thrust chamber using kerosene as coolant.The test was conducted with the different AR structure parameters in square straight channels using kerosene as medium under different condition(roughness height is less than 1.0mm,the maximum inlet pressure no less than 20MPa and velocity was 60m/s).The results indicate that the heat transfer was enhanced rapidly by the increase of the rib height at the beginning and then became slowly,while the pressure drop was overtaken.Compared with the smooth square tube,it is approximately up to 2-fold increase in local heat transfer and 2-fold in surface friction resistance with AR.