| 含人为粗糙元微小冷却通道内的流动与换热 | |
| 陈建华 ; 张会强 ; 张贵田 ; CHEN Jianhua ; ZHANG Huiqiang ; ZHANG Guitian | |
| 2010-05-14 ; 2010-05-14 | |
| 关键词 | 对流换热 再生冷却 微细通道 人为粗糙元 convection heat transfer regenerative cooling mini cooling channel artificial roughness TK124 |
| 其他题名 | Flow and heat transfer in a mini cooling channel with artificial roughness |
| 中文摘要 | 针对液体火箭发动机再生冷却中的结焦问题,对含粗糙元微小冷却通道内的流动和换热进行数值研究。相对无粗糙元通道,粗糙元能获得3%的换热强化,并使流动阻力增加12%。粗糙元的存在增加了2个热侧壁附近的对流强度和热底壁附近流动的法向速度,提高了流动的湍流脉动,因而强化了换热。研究发现无粗糙元通道出口截面最高温度为330K,与最低温度相差36K,而含粗糙元通道出口截面最高温度只有312K,和最低温度相差14K。可见引入粗糙元能够大大改善局部热集中,有利于防止冷却剂的结焦。; The failure of regenerative cooling due to propellant coking in a liquid rocket engine was investigated by numerically analyzing the flow and heat transfer in a mini cooling channel with artificial roughness. The heat transfer is increased by 3% compared with a smooth cooling channel,while the flow resistance is inceased by 12% for the same channel with artificial roughness.The convection intensity near the two hot side walls,the normal velocity near the hot bottom wall,and the turbulent fluctuating velocities also increase due to the artificial roughness,which leads to the heat transfer enhancement.The maximum temperature in the exit section is 330 K with a difference between the maximum and minimum temperatures of 36 K for the smooth channel while the outlet temperature for the artificially rough channel is 312 K with a difference of 14 K.The results show that the thermal gradients in the mini cooling channel are significantly reduced by the artificial roughness,which reduces coking. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/33533]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 陈建华,张会强,张贵田,等. 含人为粗糙元微小冷却通道内的流动与换热[J],2010, 2010. |
| APA | 陈建华,张会强,张贵田,CHEN Jianhua,ZHANG Huiqiang,&ZHANG Guitian.(2010).含人为粗糙元微小冷却通道内的流动与换热.. |
| MLA | 陈建华,et al."含人为粗糙元微小冷却通道内的流动与换热".(2010). |
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