复杂结构低温涡轮泵预冷特性集总参数仿真研究

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关键词：涡轮泵；低温预冷；集总参数仿真；沸腾传热

中图分类号： V421.4+2 文献标志码：A

DOI：10.7652/xjtuxb202511017 文章编号：0253-987X（2025）11-0177-10

Abstract： To achieve quantitative prediction of precooling characteristics and patterns in rocket engine cryogenic turbopumps，addressing the technical challenge where AMESim software cannot accurately predict two-phase heat transfer during precooling，a chilldown simulation of liquid oxygen turbopump by lumped parameter approach. First， the complex turbopump structure was simplified based on a thermal capacitance equivalence method，enabling synchronous precooling simulation of pre-cooling for both the turbopump casing and core. Subsequently， cryogenic twophase flow pattern identification and boiled heat transfer models are incorporated into AMESim software to establish a multi-node lumped-parameter prediction model for turbopump precooling. Finally，this model is employed to predict the precooling behavior of a complex liquid oxygen turbopump under varying operating conditions. Results demonstrate that the developed cryogenic precooling lumped-parameter model achieves a maximum error of less than 6.0% in predicting precooling duration. The core precooling time constitutes merely 3.7% of the casing precooling time，indicating that the casing's precooling process dominates the overal turbopump precooling progression. Increasing the inlet pressure enhances heat transfer rates between the fluid and structure，facilitating rapid precooling，albeit at the cost of greater liquid consumption during the process. The established AMESim precooling model provides a novel methodological option for studying the operational principles of cryogenic rocket engines.

Keywords： turbopump; cryogenic childown; lumped-parameter simulation; boiled heat transfer

低温火箭发动机点火前，需要对涡轮泵等重要部件展开充分预冷。（剩余14212字）