摘要
研究随机动力学理论与统计散布取样技术,提出对飞行器抛撒"海量"箔条及形成箔条云有限分组随机统计模拟方法;采用所建立空气动力学理论与计算技术,提出可有效模拟稀薄流到连续流不同高度、马赫数、攻角与侧滑角及极高长细比箔条气动特性计算方法;研制飞行力学数值方法,计算确定任意时刻箔条个体团空间位置、速度;应用所发展随机动力学加权技术及概率统计分布原理,进行箔条云整体性能分析,建立箔条云跨流域飞行整体运动性能与覆盖范围统计模拟方法。对飞行器抛撒"海量"箔条形成箔条云跨流域飞行气动特性计算分析,模拟仿真结果与实验测试相吻合,证实所建立箔条及箔条云跨流域整体气动特性计算分析方法的工程实用与可靠性。
The statistical simulation technique in random sample for the numerous chaffs and chaff-cloud released by the aerocraft is founded on the theory of stochastic dynamics and statistical diffusive sampling.Based on the aerodynamic theory and computing technique established in the recent years,the evaluating algorithm for the aerodynamic characteristic of chaff bodies with the high long and slender ratio has been developed for various altitudes,flying angles and Mach numbers from rarefied free-molecular flow to continuum flow regimes.The numerical method of trajectory flying mechanics is studied and applied to calculate the space situation and velocity of the flying chaff groups at any time.The holistic performance of the chaff cloud is analyzed and studied in mathematical modeling and simulation by developing the weighted technique of stochastic dynamics and statistical distribution theory.As a result,the statistical simulating method on the holistic aerodynamics and covering range of chaff cloud from various flow regimes has been founded.The holistic flying characteristic of the numerous chaffs and chaff clouds released by aerocraft is computed and analyzed as the primary application of the present method.The present simulating results are tallied with the theoretical forecast and experiment testing,which displays the engineering practicality and reliability of the present method in simulating the flying contrail,overcast range and holistic aerodynamics of the chaff cloud including space position,number density,flying gesture and velocity across the atmosphere inside and outside.
出处
《空气动力学学报》
EI
CSCD
北大核心
2011年第1期59-67,共9页
Acta Aerodynamica Sinica
基金
北京航天长征飞行器研究所仿真预研项目
国家自然科学基金重点项目(91016027)资助
关键词
箔条云
空气动力学
随机动力学
飞行力学
概率分布理论
统计计算
chaff cloud
aerodynamics
stochastic dynamics
flying mechanics
probability distribution theory
statistical computation
