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Investigation of the Flow Structure on a Flat Plate Induced by Unsteady Plasma Actuation with DNS Methods 被引量:1
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作者 俞建阳 陈浮 +1 位作者 刘华坪 宋彦萍 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第12期1032-1037,共6页
An investigation into the flow characteristic on a flat plate induced by an unsteady plasma was conducted with the methods of direct numerical simulations(DNS).A simplified model of dielectric barrier discharge(DBD... An investigation into the flow characteristic on a flat plate induced by an unsteady plasma was conducted with the methods of direct numerical simulations(DNS).A simplified model of dielectric barrier discharge(DBD) plasma was applied and its parameters were calibrated with the experimental results.In the simulations,effects of the actuation frequency on the flow were examined.The instantaneous flow parameters were also drawn to serve as a detailed study on the behavior when the plasma actuator was applied to the flow.The result shows that induced by the unsteady actuation,a series of vortex pairs which showed dipole formation and periodicity distribution were formed in the boundary layer.The production of these vortex pairs indicated a strong energy exchange between the main flow and the boundary layer.They moved downstream under the action of the free stream and decayed under the influence of the fluid viscosity.The distance of the neighboring vortices was found to be determined by the actuation frequency.Interaction of the neighboring vortices would be ignored when the actuation frequency was too small to make a difference. 展开更多
关键词 unsteady vortex turbulent actuator dipole downstream turbulence neighboring periodicity dielectric
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世界进入新的动荡变革期与新时代的中国
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作者 傅梦孜 《Contemporary International Relations》 2023年第3期74-96,共23页
The world is undergoing profound changes unseen in a century.As the changes are accelerating,their impact is intensifying.International politics is experiencing a return to realism,and the rise of hegemonic power is a... The world is undergoing profound changes unseen in a century.As the changes are accelerating,their impact is intensifying.International politics is experiencing a return to realism,and the rise of hegemonic power is antagonizing global relations.Globalization has encountered setbacks,and world economic growth is contracting.The international order is tumbling and is facing reconstruction.Nontraditional security threats have become more diverse.Great power conflicts are looming large.The 20th National Congress of the Communist Party of China has drawn a magnificent blueprint for constructing Chinese-style modernization.China,a responsible power in its historic rise,will be a stabilizing force in a turbulent world and a constructive force for global transformation.China provides stability,positive energy,great global peace,and development opportunities. 展开更多
关键词 new period of turbulence and transformation international order power politics GLOBALIZATION China opportunity
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