Nonequilibrium shock layer temperature profiles from arc jet radiation measurementsShock layer temperature profiles are obtained through analysis of radiation from shock layers produced by a blunt body inserted in arc jet flow. Spectral measurements have been made in a nitrogen flow of 54.4 gm/s at an enthalpy of 8.72 MJ/kg. Vibrational temperatures for N2+ are obtained by matching spectral regions from arc jet spectra with spectra generated using the NEQAIR code. Temperature profiles obtained from the radiation layers show a vibrational temperature higher than the rotational temperature near the front of the shock and both temperatures decrease as the flow approaches the body. The spectral measurements are made and analysis completed for four distances, from the surface of the blunt body. The corresponding shock layer thickness is approximately 3.6 cm. Although the shock layer appears to be in thermal nonequilibrium, the measured rotational temperature approaches the single temperature results of viscous shock layer calculations at this test condition.
Document ID
19890055830
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Blackwell, Harvel E. (BSA Services Houston, TX, United States)
Yuen, Eric (BSA Services Houston, TX, United States)
Scott, Carl D. (NASA Johnson Space Center Houston, TX, United States)
Arepalli, Sivaram (Lockheed Engineering and Sciences Co. Houston, TX, United States)