Abstract
Flow visualization of laser energy addition upstream blunt bodies in hypersonic flow was achieved by means of open shutter photography and high‐speed cameras techniques. The laser energy was supplied by two CO2 TEA lasers, sharing the same optical cavity, while the hypersonic flow was generated in the IEAv 0.3m Hypersonic Shock Tunnel — HST test section. Single and double laser pulses, generated during the tunnel useful test time, were focused through a NaCl lens upstream a simple hemisphere‐cylinder and Double Apollo Disc models. A regular SLR camera, a high‐speed CCD camera and an ultra‐high speed electronic tube camera provided imaging. Preliminary results using the ultra‐high speed camera in a shadowgraph/schlieren arrangement revealed the dynamic complex flow structure that is established during the addition of the laser energy to the hypersonic flow upstream a blunt body.
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