空间控制技术与应用2025，Vol.51Issue(6)：108-118,11.DOI:10.3969/j.issn.1674-1579.2025.06.010
高温壁面条件下冷却液膜多相动力学的数值研究
Numerical Investigation of the Multiphase Dynamics of Cooling Liquid Films Under High-Temperature Wall Conditions
摘要
Abstract
To address the unclear understanding of liquid film formation and evolution during film cooling in small-thrust liquid rocket engines under high-temperature wall conditions,this study performs numerical simulations using a coupled Volume-of-Fluid(VOF)and Level Set multiphase flow model,along with a shell conduction approach.The simulations investigate the dynamics of coolant jets impinging on hot walls,including film spreading,boiling,breakup,and splashing.Results indicate that as wall temperature increases,the downstream nucleate boiling zone of the liquid film expands significantly,the film breaks up earlier,and the hydraulic jump disappears.Notably,when the wall temperature exceeds the Leidenfrost point(～900 K),a vapor layer rapidly forms between the film and wall,intensifying film fragmentation and deflecting splashing droplets with smaller size distributions.Statistical analysis shows that the film spreading angle is largely unaffected by wall temperature but is significantly influenced by the jet impingement angle,highlighting the dominant role of inertial impact in determining the film coverage.Meanwhile,the wetted area decreases markedly with rising wall temperature,leading to a considerable reduction in cooling effectiveness.This work clarifies the key role of wall thermal conditions in regulating boiling mechanisms and film stability,providing insights for the design and optimization of film cooling strategies under extreme heat flux conditions,and laying a foundation for further investigation in more complex environments.关键词
小推力液体火箭发动机/液膜冷却/高温壁面/液膜铺展/液滴飞溅Key words
small-thrust liquid rocket engine/liquid film cooling/high-temperature wall/liquid film spreading/droplet splashing分类
航空航天引用本文复制引用
PAN Jianguang,TANG Yihao,HAN Wang,WANG Fengshan,MAO Xiaofang,YAO Zhaopu..高温壁面条件下冷却液膜多相动力学的数值研究[J].空间控制技术与应用,2025,51(6):108-118,11.基金项目
CAST创新基金项目,面上创新基金,"高比冲发动机液膜冷却与二次高效补燃机制研究"(WYYY-19009.23) （WYYY-19009.23）
国家重点研发计划青年科学家项目(2022YFF0504500) （2022YFF0504500）
国家自然科学基金资助项目(52376090) CAST Innovation Fund Project,General Innovation Fund on"Mechanisms of High-Specific-Impulse Engine Liquid Film Cooling and Secondary Efficient Combustion Enhancement"(WYYY-19009.23) （52376090）
National Key R&D Program-Young Scientists Project(2022YFF0504500) （2022YFF0504500）
Project Supported by National Natural Science Foundation of China(NSFC)(52376090) （NSFC）
