Quasi-Steady-State scheme and application on prewhirl flow and heat transfer in aeroengine

Abstract

For solving three-dimensional complex unsteady flow to predict aerodynamic characteristics of turbine disc cavity in aeroengine, a quasi-steady-state scheme is proposed. To validate and get reliable turbulence model, three-dimensional numerical studies, of turbine disc cavity prewhirl flow and heat transfer, are conducted. For comparison, unsteady state computational fluid dynamics simulations of prewhirl flow are also performed. Five turbulence models, including standard k-a model, RNG k-a model, Realizable k-a model, SST k-u model and RSM model, are applied both quasi-steady-state scheme and unsteady CFD. Then, reliable quasi-steady-state scheme is obtained and the feasibility, instead of unsteady-state CFD simulation for reducing time resource, is verified. Furthermore, investigations of prewhirl flow and heat transfer in turbine disc cavity of aeroengine are conducted by the proposed quasi-steady-state scheme. It was found that the rotation Reynolds number should be increased to strengthen the blade cooling and weaken the heat transfer in turbine disc cavity. All the results are applied in the design of aeroengine. Also, it proves that quasi-steady-state scheme is effective in the prediction of aerodynamic characteristics in aeroengine.