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The improvement of prediction accuracy for rarefied aerodynamics is one of the important factors for space missions. In order to improve rarefied aerodynamic prediction, rarefaction and condensation effects have been investigated experimentally and numerically in this work. Pitot pressure measurements for N 2 nozzle flows have been carried out in the hypersonic rarefied wind tunnel (HRWT). The rarefaction phenomenon was found to impact the measurements, and thus, we have developed a rarefactiondoi:10.2322/tastj.14.pe_1 fatcat:23cptb7ugvesnkkq2hbzmhndgm