摘要
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。
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 1.0ram, the maximum inlet pressure no less than 20MPa and velocity was 60m/s）. The resuits 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 apDroximatelv up to 2-fold increase in local heat transfer and 2-fold in surface friction resistance with AR.
作者
陈建华
张贵田
吴海波
夏开红
周立新
吕发正
Chen, Jian-Hua[1]; Zhang, Gui-Tian[1,2]; Wu, Hai-Bo[2]; Xia, Kai-Hong[2]; Zhou, Li-Xin[2]; Lu, Fa-Zheng[2]
出处
《实验流体力学》
EI
CAS
CSCD
北大核心
2008年第4期34-38,共5页
Journal of Experiments in Fluid Mechanics
关键词
推力室
人为粗糙度
强化换热
煤油
传热实验
thrust chamber
artificial roughness
heat transfer enhancement
kerosene
heat transfer experi-ment
