VELOCIMETRY AND THERMOMETRY OF SUPERSONIC-FLOW AROUND A CYLINDRICAL BODY

The supersonic flow around a cylindrical body has been studied using t wo optical techniques. For both sets of measurements, the cylinder was mounted from the side of the tunnel, allowing investigation of the bo w shock region as well as in the wake. A new technique, laser-enhanced ionization flow tagging, was used for streamwise velocity determinati ons behind the body. From these measurements, it was found that the do wnstream velocity outside the wake was (1.90 +/- 0.06) km/s, whereas i nside the wake the velocity was about 0-500 m/s in the upstream direct ion. Planar laser induced fluorescence of nitric oxide was employed fo r temperature determinations. It was established that the freestream t emperature was (2120 +/- 100) K, decreasing to around (1550 +/- 400) K in the wake.