Non-isentropic effects on the WRDC 20 inch hypersonic wind tunnel calibration

Abstract

ability to calibrate wind tunnel flows is of increasing importance. Even small errors in Mach An experiment was conducted in the 20" number cannot be tolerated. hypersonic wind tunnel to assess non-isentropic Reference [ l ] concludes that hypersonic wind effects on the test section Mach number. Prestunnels operating above Mach 8 are likely to have sure measurements were made on a blunt 5" cone. These pressures were then compared with a Parabolized Navier-Stokes code to define the freestream Mach number. The results indicate that the non-isentropic effects are not significant.