Numerical simulation of real air flow and heat exchange in hypersonic wind tunnels

Abstract

The purpose of this work is to examine stream parameters in circuits of hypersonic facilities and to determine the degree of influence of non-equilibrium physical and chemical processes using numerical modeling of real gas flow and heat transfer. For numerical modeling, the work employs the well-known ANSYS Fluent software and the HSFlow program (development of TsAGI) supplemented by a physicochemical module. Axisymmetric Navier-Stokes equations for viscous heat-conducting gas are solved in combination with the equations of chemical kinetics and oscillatory mode energy relaxation. Calculations were performed for the flow field in the nozzles and test sections of two facilities: T-122M (without a model) and VAT-104 with a model of a cylinder in the test section. Results were compared with the results of calculations that employed a simplified model of real air properties where only equilibrium excitation of oscillatory degrees of freedom of oxygen and nitrogen molecules was considered.