摘要
论文采用高阶精度有限差分方法直接数值模拟(DNS)钝锥高超音速绕流中来流脉冲波扰动非定常流场,以快声波脉冲为例,分析了脉冲扰动波与弓形激波和边界层之间的相互干扰及扰动在高超音速流场中的发展、演变和耗散过程,研究了快声脉冲波幅值变化对流场气动热力学特性等的影响.结果表明,流场气动热力学特性显著地受到快声波脉冲影响,流场密度在脉冲与弓形激波干扰区域显著增大,而法向速度则在脉冲与壁面边界层干扰区域变化尤为显著,并在壁面附近产生了法向速度涡,扰动幅值越大,涡的强度越大,但其影响区域变小.弓形激波在来流脉冲作用下出现变形并向内侧弯曲,来流扰动幅值越大,弓形激波变形越大,流场参数受影响也越大,但幅值变化对流场参数变化趋势影响很小.
Direct numerical simulation of pulse disturbance in hypersonic flow over a blunt cone is conducted by using high-order accuracy finite difference method.Based on fast acoustic wave pulse,the interactions between pulse wave and bow shock as well as boundary layer are analyzed,and the evolution,development and dissipation process of slow acoustic waves pulse disturbance are discussed.The effects of slow acoustic waves pulse disturbance on flow field as well as aerothermodynamics properties on wall are investigated.Results show that aerothermodynamics properties are significantly affected by the fast acoustic wave disturbance;the density of flow field become larger sharply at the area of the interaction between pulse disturbance and bow shock;while the normal velocity changed significantly at the area of the interaction between pulse wave and boundary layer.The eddy of normal velocity will be generated near wall during the disturbance process;with the amplitude of pulse rises,the velocity become larger,and the area of the eddy become smaller.The deformation of bow shock will appear as it confronts pulse disturbance wave.With the amplitude of pulse rises,the deformation of bow shock and the effect of pulse disturbance wave become lager;while the effect of the amplitude to the trends of flow field parameters is tiny.
出处
《固体力学学报》
CAS
CSCD
北大核心
2013年第S1期49-57,共9页
Chinese Journal of Solid Mechanics
基金
教育部博士点基金项目(20112304110015)
中央高校基本科研业务费(HEUCF100204
HEUCF130216)资助
关键词
高阶精度
高超音速流动
快声波
脉冲扰动
钝锥
high-order accuracy
hypersonic flow
fast acoustic wave
pulse disturbance
blunt cone
