Megahertz pulse-burst laser and visualization of shock-wave/boundary-layer interaction
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The development and application of a Nd:YAG pulse-burst laser system, which is capable of operating at up to 1-MHz pulse repetition rate with high pulse energy and narrow spectral linewidth, is presented. The laser system can generate a burst of from 1 to 99 pulses over a maximum time interval of 100 s. The average single pulse energy at 1.064 is 10 mJ. This laser is paired with a new megahertz-rate charge-coupled device framing camera to obtain images of a Mach 2.5 flow over a 14-deg angle wedge at a 500-kHz repetition rate. The sequential images clearly show the dynamic interaction between the incoming turbulent boundary layer and the unsteady oblique shock wave.
author list (cited authors)
Wu, P. F., Lempert, W. R., & Miles, R. B.
complete list of authors
Wu, PF||Lempert, WR||Miles, RB