Abstract
The contribution deals with the numerical simulation of 2D compressible flow though the tip-section turbine blade cascade with the supersonic inlet boundary conditions. The simulation was carried out by the in-house numerical code using the explicit algebraic Reynolds stress model completed by the bypass transition model with the algebraic equation for the intermittency coefficient. The γ-Re model implemented in the commercial code Fluent was used for the comparison. Predictions carried out for the nominal conditions were focused on the effect of inlet free-stream turbulence on the flow structure in the blade cascade under supersonic inlet conditions. Numerical results were compared with experimental data.
Highlights
Flows in turbine blade cascades are influenced by many parameters which should be considered in numerical simulations
The mathematical model of compressible flow is based on conditionally-averaged NavierStokes equations completed by constitutional relations for the ideal gas, the explicit algebraic turbulence model (EARSM) by Hellsten [3], the algebraic transition model proposed by Straka and Příhoda [1] and by the model of turbulent heat transfer based on the generalized gradient hypothesis according to Launder [4]
The explicit algebraic model of Reynolds stresses with the algebraic transition model based on local variables was used for the numerical simulation of compressible flow through the tip-section turbine blade cascade TR-U-6 with supersonic inlet conditions
Summary
Flows in turbine blade cascades are influenced by many parameters which should be considered in numerical simulations. Such parameters are the effect of freestream turbulence and possibly wall roughness that influence noticeably the transition to turbulence and the turbulent heat transfer. The transonic and supersonic flows though the turbine blade cascade are considerably influenced by the interaction of shock waves with the boundary layer on the blade surface that can cause the transition to turbulence in separated flow. Simulations were focused mainly on the effect of the inlet freestream turbulence on the flow structure in the blade cascade.
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