# title
Repetitively Pulsed Hypersonic Flow Apparatus for Diagnostic Development

# abstract
Arepetitively pulsed hypersonic test facility has been constructed and characterized. This apparatus was designed to enable advanced laser diagnostic development. The underlying principle is to synchronize the intermittent tunnel operation with the laser pulses to achieve effectively continuous operation. Repetitively pulsed (2-20 ms pulse lengths) uniform supersonic flow at Mach 4.6 and hypersonic flow at Mach 6.2 were demonstrated for extended operation. The nozzle flows were characterized using fast-response pressure sensors and NO planar laser-induced fluorescence imaging for two-dimensional temperature and velocity measurements. The pulse-to-pulse impact pressure repeatability was within 1.0%, corresponding to exit flow velocity and temperature fluctuations of 0.7 and 1.0%, respectively. The apparatus can operate over a unit Reynolds number range of 6:0 104 to 3: 2 0  10 6 m -1.  2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.  2011 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc.

# authors[].organizations[].label
Texas A&M Engineering Experiment Station (TEES)

# publisher.label
American Institute of Aeronautics and Astronautics (AIAA)

# keywords[]
4012 Fluid Mechanics And Thermal Engineering

# authorList[]
Sanchez-Gonzalez, R., Srinivasan, R., Hofferth, J., Kim, D. Y., Tindall, A. J., Bowersox, R., & North, S. W.