Numerical study of non-equilibrium condensation and shock waves in transonic moist-air and steam flows

作者：Hamidi S^*; Kermani M J

来源：Aerospace Science and Technology, 2015, 46: 188-196.

DOI：10.1016/j.ast.2015.07.011

• Moist-air flow
• Condensation shock
• Normal aerodynamic shock
• Wetness fraction

Transonic condensing/evaporating moist-air flow through converging-diverging nozzles is investigated numerically using non-equilibrium thermodynamic model. In this study, the results of moist-air and pure steam flows through nozzles are compared, in other words, carrier gas effects are investigated numerically. It is observed that, under similar operating conditions for steam, the wetness fraction and droplet nucleation rate along the nozzle in the case of moist-air flow is more than pure steam case. That is due to the internal flow of heat from steam portion towards the air that enhances the wetness fraction and droplet nucleation rate in moist-air case. In this study, the influence of the normal aerodynamic shocks is also studied. It is interestingly observed that, although the entropy of the mixture (steam+air) and steam portion increases along the shock, the entropy of the air portion can be reduced in response to evaporation of the liquid phase. Validation of the results is performed versus the experimental data for pure steam and moist-air flows, which show relatively good agreements.

• 出版日期2015-11