文献类型：期刊文献

英文题名：Flow characteristics and transition mechanism of boiling modes of liquid film formed by jet impinging on a heated wall

作者：Li, Ting[1];Lin, Qing-guo[2];Wang, Sheng-ju[1];Hu, Bo-lin[1];Tan, Ming-yang[1];Liu, Hai-feng[1,3];Li, Wei-feng[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Coal Liquificat Gasificat & Utilizat, Shanghai 200237, Peoples R China;[2]Shanghai Inst Space Prop, Shanghai Engn Res Ctr Space Engine, Shanghai 201112, Peoples R China;[3]Liaoning Petrochem Univ, Fushun 113001, Liaoning, Peoples R China

年份：2026

卷号：292

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20260920152878);WOS:【SCI-EXPANDED(收录号:WOS:001701562000001)】；

基金：This study was supported by National Natural Science Foundation of China (U21B2088 and 22278133) .

语种：英文

外文关键词：Inclined impinging jet; Liquid film cooling; Flow and heat transfer; Boiling mode

摘要：Inclined jet impingement cooling technology is widely adopted for effective thermal management of liquid rocket engines. To gain an in-depth understanding of the liquid film cooling mechanism and optimize the design of liquid film cooling schemes, systematic experimental studies were conducted in this paper. The effects of jet Reynolds number, initial wall temperature, wall thickness, and monitoring position on the flow characteristics and transition mechanism of boiling modes of liquid film were investigated. The results show that on the wall with an initial temperature of 300 degrees C, the maximum heat flux increases with increasing jet Reynolds number and decreases radially under all conditions. Quantitative results indicate that when the wall thickness doubles, the average wetted area of the liquid film increases by 18%, while the maximum heat flux declines by 58% on average due to the increased thermal resistance of the wall. In addition, lowering the initial wall temperature elevates the wetting rate but leads to an average decrease of 51% in the maximum heat flux. Conversely, increasing the initial wall temperature induces film boiling. The inherent vapor layer accompanying film boiling impedes liquid film wetting and reduces the heat flux to merely 23% of the peak value. Increasing the jet Reynolds number can disrupt the formation of the vapor layer, thereby suppressing the onset of film boiling. Due to the formation of the precursory cooling zone, film boiling does not occur when the wetting front reaches the downstream monitoring points. The results of this paper provide valuable data and important references for the optimal design of liquid rocket engines.