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爆震发动机扩张型引射喷管的非定常流动过程研究 被引量:1
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作者 郭昆 唐海龙 张坤 《推进技术》 EI CAS CSCD 北大核心 2015年第12期1781-1787,共7页
为揭示PDE引射喷管的瞬态流动机理,采用带化学反应的非定常仿真方法,对使用二维扩张型引射器PDE的非定常排气过程进行分析,获得了流场结构的瞬态演化过程,并将其单循环的积分冲量与无引射喷管状态进行了对比。结果表明,仿真中形成了稳... 为揭示PDE引射喷管的瞬态流动机理,采用带化学反应的非定常仿真方法,对使用二维扩张型引射器PDE的非定常排气过程进行分析,获得了流场结构的瞬态演化过程,并将其单循环的积分冲量与无引射喷管状态进行了对比。结果表明,仿真中形成了稳定的爆震波,其主要特性参数与理论值相差较小,并且仿真获得爆震排气过程的流动结构与试验结果吻合良好。带引射器PDE的单循环主要流动过程可以分为:爆震波产生和排出阶段、引射器主动进气阶段、爆震管第一次倒流阶段、爆震管主动排气阶段、爆震管第二次倒流阶段。相比无引射器状态,使用扩张型引射器可以使PDE单循环积分冲量增加21.76%,并且其对爆震管头壁压强、单次循环周期无明显影响。 展开更多
关键词 脉冲爆震发动机 扩张型引射器 积分冲量 数值模拟
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Further Study of A-Related Quantum Interference of H-State Diatomic on Collision-Induced Rotational Energy Transfer 被引量:5
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作者 LI Yong-Qing SONG Peng +2 位作者 CHEN Yue-Hui WANG Wei-Li MA Feng-Cai 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第2X期347-352,共6页
In our previous theoretical studies [Meng-Tao Sun, Yong-Qing Lee, and Feng-Cai Ma, Chem. Phys.Left. 371 (2003) 342], we have reported the quantum interference on collision-induced rotational energy transfer on CO (... In our previous theoretical studies [Meng-Tao Sun, Yong-Qing Lee, and Feng-Cai Ma, Chem. Phys.Left. 371 (2003) 342], we have reported the quantum interference on collision-induced rotational energy transfer on CO (A ^1 Π,v = 3) with inert gases, which originates from the difference between the two A-related collision potential energy surfaces. The interference angle, which measures the degree of coherence, is presented in this paper. Based on the time-dependent first order Born approximation, taking into account the anisotropic Lennard-Jones interaction potentials, the relation of the interference angle with the factors, including experimental temperature, partner, and rotational quantum number, are obtained. The changing tendencies with them are discussed. This theoretical model is important to understanding and performing this kind of experiment. 展开更多
关键词 quantum interference rotational energy transfer interference angle
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IMPULSIVE BOUNDARY VALUE PROBLEMS FOR STURM-LIOUVILLE TYPE DIFFERENTIAL INCLUSIONS 被引量:2
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作者 Yicheng LIU Jun WU Zhixiang LI 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2007年第3期370-380,共11页
In this paper, the authors investigate the existence of solutions of impulsive boundary value problems for Sturm-Liouville type differential inclusions which admit non-convex-valued multifunctions on right hand side. ... In this paper, the authors investigate the existence of solutions of impulsive boundary value problems for Sturm-Liouville type differential inclusions which admit non-convex-valued multifunctions on right hand side. Two results under weaker conditions are presented. The methods rely on a fixed point theorem for contraction multi-valued maps due to Covitz and Nadler and Schaefer's fixed point theorem combined with lower semi-continuous multi-valued operators with decomposable values. 展开更多
关键词 Boundary value problems contraction multi-valued map impulsive differential inclusions measurable selection.
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