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中文摘要：
钝头体跨声速段稳态流场的数值模拟结果显示,其尾流区内含有丰富的流场结构,流场结构直接影响着钝头体的后体压力分布.自由振动数值模拟结果显示,钝头体在跨声速区出现动不稳定,最终进入极限环振动.通过分析发现,在振动过程中,钝头体前体对流场做正功,释放钝头体振动能量,抑制振幅增加,流场对钝头体后体做正功,增加钝头体振动能量,导致振幅增加,当两者相等时,振动进入极限环状态.
英文摘要：
Flowfield around a blunt body at transonic speed is simulated numerically.It indicates that plentiful flowfield structures behind the blunt body determine base pressure distribution.Numerical simulation of free pitch oscillation shows that limited cycle oscillation is observed as a result of dynamic instability in transonic regime.During a free pitch oscillation,front part blunt body conducts work to the flow field which releases blunt body energy and inhibits swing.The rear part of the blunt body gains energy from the flow field which increases the blunt body energy and the motion is considered unstable.As energy of the front blunt body and the rear body is equal,the capsule falls into a limited cycle oscillation.
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