Numerical study of the gas flow in nozzles and supersonic jets for different values of specific heats

The process of the issuing of a supersonic jet from a flat tapered nozzle has been investigated with two values of ratio of isobaric to isochoric specific heats (γ = cp cV) and different parameters NPR (nozzle pressure ratio) on the basis of numerical modeling. NPR parameter represents the ratio of the pressure at the nozzle inlet to the pressure in the environment. As a result the solid state grid model have been created for the numerical simulations of the flow of gas inside the nozzle and jet formation of compressed gas from the nozzle, which can be used to analyze the data structure. For the same value of the parameter NPR, but at a smaller value of γ an intersection point shifts further away from the inlet section of the nozzle. The flow separation becomes substantially less.