纳秒脉冲激光降低超声速流场波阻机理研究  

Study on the Mechanism of Wave Drag Reduction in Supersonic Flow by Nanosecond Pulsed Laser

作　　者：江鹏[1] 卿泽旭 王殿恺 JIANG Peng;QING Ze-Xu;WANG Dian-Kai(Beijing Special Engineering Design and Research Institute,100028,China;State Key Laboratory of Laser Propulsion and Applications,University of Aerospace Engineering,Beijing,101416,China)

机构地区：[1]北京特种工程设计研究院,北京100028 [2]航天工程大学激光推进及其应用国家重点实验室,北京101416

出　　处：《机电产品开发与创新》2024年第1期15-18,共4页Development & Innovation of Machinery & Electrical Products

基　　金：国家自然科学基金(12272133)、激光推进及其应用国家重点实验室自主课题。

摘　　要：纳秒脉冲激光能量沉积在减小超声速波阻方面具有显著的优势和潜在应用价值。为揭示纳秒脉冲激光降低超声速流场波阻机理,利用激光能量非对称沉积模型,建立了在Fluent软件中自定义激光能量沉积区域初始温度的数值模拟方法,研究了在气流马赫数为1.92、圆柱形钝头体直径为20mm、沉积激光重复频率为80kHz时的减阻过程。结果表明:高重频激光在超声速流场中沉积形成一系列低压涡环,涡环合并构成一个“激光空气锥”结构覆盖在钝头体表面,使得波阻减小,在高激光频率的条件下,“激光空气锥”还可以抑制透射激波的再压缩过程,减阻效果稳定。Nanosecond pulsed laser energy deposition has significant advantages and potential application value in supersonic wave drag reduction.In order to reveal the mechanism of nanosecond pulsed laser reducing the wave drag in supersonic flow fields,a numerical simulation method for customizing the initial temperature of the laser energy deposition region in Fluent software was established using a laser energy asymmetric deposition model.The drag reduction process was studied at a Mach number of 1.92,a cylindrical blunt body diameter of 20 mm,and a deposition laser repetition rate of 80 kHz.The results show that a series of low-pressure vortex rings are formed by deposition of high repetition frequency laser light in the supersonic flow field,and the vortex rings merge to form a"laser air cone"structure covering the surface of the blunt body,which reduces the wave resistance.Under high laser frequency conditions,the"laser air cone"can also suppress the recompression process of transmitted shock waves,with stable drag reduction effects.

关 键 词：激光 纳秒脉冲 高重频 超声速 减阻 

分 类 号：TN249[电子电信—物理电子学]