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Frequency modulation in shock wave-boundary layer interaction by repetitive-pulse laser energy deposition
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Modulation of shock foot oscillation due to energy deposition by repetitive laser pulses in shock wave-boundary layer interaction over an axisymmetric nose-cylinder-flare model in Mach 1.92 flow was experimentally studied. From a series of 256 schlieren images, density oscillation spectra at each pixel were obtained. When laser pulses of approximately 7 mJ were deposited with a repetition frequency, f
e, of 30 kHz or lower, the flare shock oscillation had a peak spectrum equivalent to the value of f
e. However, with f
e of 40 kHz–60 kHz, it experienced frequency modulation down to lower than 20 kHz.
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