Algebraic and k-ɛ Turbulence Model Comparison in the Problem of the Boundary Layer on the Walls of a Rotating Axisymmetric Diffuser

The problem turbulent boundary layer modeling on rotating diffuser walls using algebraic and k-ɛ turbulence model was considered. An algorithm for boundary layer calculation in axisymmetric channels with axial rotation based on the “box” scheme finite-difference method was developed. Flow velocity at the outer edge of the boundary layer was calculated using the law of constant rate. For calculation of laminar and turbulent flow inside diffuser with opening angle 10° at varies speeds its axial rotation was used Vertel code, written in MATLAB. Results of this calculation correspond to results of this diffuser experiment investigation, based on PIV method. K-ɛ turbulence model gives slightly better results.