Microwave Shock-Speed Diagnostic Development and Analysis of Expansion Tunnel Viscous Effects

摘要: The development of a nonintrusive microwave shock-speed measurement for expansion tunnels is presented, based on standing-wave reflection. Testing performed in large-scale expansion-tunnel facility, with the goal characterizing viscous effects. Expansion generate high-enthalpy test conditions short times, and gas never heated such that excessive freestream dissociation or ionization occurs. system measures primary secondary shock speeds accurately high spatial resolution along length yielding more accurate conditions. It shown to be both practical low cost. tunnel used assess attenuation. Negligible attenuation found over wide range gases, attributed large diameter facility’s driven tubes. Shock-tube boundary-layer growth solutions Mirels’s theory (“Shock Tube Test Time...