空气动力学学报2025，Vol.43Issue(11)：27-34,8.DOI:10.7638/kqdlxxb-2024.0136
超低轨航天器表面气固相互作用的分子动力学模拟
Molecular dynamics simulation of gas-solid interaction on the surface of ultra-low orbit spacecraft
摘要
Abstract
In order to accurately simulate the aerodynamic characteristics and optimize the aerodynamic layout of spacecraft in ultra-low orbit,based on the physical mechanism of high-speed incoming gas and wall interaction faced by ultra-low orbit spacecraft,molecular dynamics methods were used to analyze the influence and mechanism of incoming gas parameters(gas temperature,macroscopic incoming gas velocity,velocity direction)and solid surface conditions(wall temperature)on the momentum and energy accommodation coefficient in the gas-surface interaction process.Research has shown that accurate calculation of momentum and energy accommodation coefficients requires consideration of the combined effects of gas dynamic parameters and wall conditions.Within the wall temperature range of 150-450 K,as the wall temperature increases,the tangential momentum accommodation coefficient remains almost unchanged,while the normal momentum accommodation coefficient and energy accommodation coefficient decrease.The tangential momentum exchange between gas and wall is not sensitive to the change of wall temperature.In the range of macroscopic inflow gas temperature from 500 K to 2000 K,as the macroscopic inflow gas temperature increases,the tangential momentum accommodation coefficient remains almost unchanged,while the normal momentum accommodation coefficient and energy accommodation coefficient increase.The magnitude and direction of macroscopic incoming gas velocity have a coupling effect on the accommodation coefficient.Within the range of macroscopic incoming gas velocity from 100 m/s to 1100 m/s,tangential velocity and normal velocity have opposite effects on the tangential momentum accommodation coefficient.An increase in tangential velocity leads to a decrease in the tangential momentum accommodation coefficient,while an increase in normal velocity leads to an increase in the tangential momentum accommodation coefficient.Therefore,the accurate momentum and energy accommodation coefficients are the result of the combined action of gas parameters and solid surface conditions.关键词
动量适应系数/能量适应系数/表面效应/分子动力学模拟/航天器/稀薄气体效应Key words
momentum accommodation coefficient/energy accommodation coefficient/surface effect/molecular dynamics simulation/spacecraft/rarefied gas effect分类
航空航天引用本文复制引用
YAO Yuzhu,HUANG Fei,JIN Xuhong,CHENG Xiaoli..超低轨航天器表面气固相互作用的分子动力学模拟[J].空气动力学学报,2025,43(11):27-34,8.基金项目
国家自然科学基金联合基金项目(U25B6025) （U25B6025）
