Study on the Mechanism of Wave Drag Reduction in Supersonic Flow by Nanosecond Pulsed Laser
Nanosecond pulsed laser energy deposition has significant advantages and potential application value in supersonic wave drag re-duction.In order to reveal the mechanism of nanosecond pulsed laser reducing the wave drag in supersonic flow fields,a numerical simula-tion method for customizing the initial temperature of the laser energy deposition region in Fluent software was established using a laser ener-gy 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 sup-press the recompression process of transmitted shock waves,with stable drag reduction effects.
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