METHODS FOR DETERMINING CONDITIONS IN REAL NITROGEN EXPANDING FLOWS

摘要

Charts are presented of correction factors to perfect gas tables to take into account the real gas effects in the isentropic expansion of nitrogen gas from high density and temperature conditions. The calculation use equilibrium thermodynamic properties based on the Culotta-Enkenhus equation of state. Also presented are charts and tables to calculate the stream quantities in the test section of a hypersonic wind tunnel where the density and temperature of the gas are sufficiently low that the gas can be considered perfect. The use of these charts and tables is explained. A computer programme is included which calculates the real gas conditions in nitrogen expanding from high density and temperature conditions to the Mach number desired, which can be used in the design of a contoured wind tunnel nozzle using the method of characteristics.