空间控制技术与应用2025，Vol.51Issue(2)：71-80,10.DOI:10.3969/j.issn.1674-1579.2025.02.007
空间环境自由分子流与壁面动量适应系数研究
The Momentum Accommodation Coefficient Between Space Environment Molecular Flow and Wall Surfaces
摘要
Abstract
Very-low-earth-orbit(VLEO)spacecraft have become a research hotspot in the field of space technology.In the VLEO environment,molecule interactions with spacecraft surfaces generate aerodynamic drag that causes velocity reduction,necessitating frequent velocity compensation.The gas flow in the VLEO environment is classified as rarefied flow regime,and the interaction between gas molecules and solid surfaces is crucial for the evaluation of aerodynamic drag.Based on the Maxwell model of gas-solid interactions,precise studies on the momentum accommodation coefficient have been conducted.Experimental results reveal that the momentum accommodation coefficient for normal incidence of VLEO space molecular flow on satellite surface material(polyimide)is 0.98,showing a downward-trend as the incidence angle increases,with a variation range of approximately 0.67 to 0.98.Aerodynamic verification is performed through cylinder flow experiments,and the computational results demonstrate strong agreement with the experimental results.This finding provides a reference for the selection of momentum accommodation coefficients for simulating atmospheric aerodynamic forces and torques of VLEO spacecraft design.关键词
超低轨/空间大气/气动力/Maxwell模型/适应系数Key words
very-low-earth-orbit/space atmosphere/aerodynamics/Maxwell model/momentum accommodation coefficient引用本文复制引用
郭占平,商圣飞,唐振宇,郑慧奇,章潜,李馨洁,贺碧蛟..空间环境自由分子流与壁面动量适应系数研究[J].空间控制技术与应用,2025,51(2):71-80,10.基金项目
国家自然科学基金资助项目(12302425) National Natural Science Foundation of China(12302425) （12302425）
