Coherent anti-Stokes Raman scattering measurements and computational modeling of nonequilibrium flow

An experimental study is conducted in a high-enthalpy continuous facility t o investigate the nonequilibrium shock-layer airflow induced by a two-dimen sional body. The rotational and vibrational temperatures of nitrogen as wel l as the number density are measured by recording the rovibrational spectra of molecular nitrogen using coherent anti-Stokes Raman scattering spectros copy. Measurements are performed in the freestream and within the shock lay er induced by a disk model. Difficulties specific to the application of an optical technique to a high enthalpy Row are discussed, and Rows parameters are given. The nozzle and shock-layer flows are modeled numerically using a nonequilibrium Navier-Stokes solver. Good agreement is achieved between t he experimental and calculated results.