NUMERICAL SIMULATION OF 3D FLOW IN AXIAL TURBOMACHINES

Abstract

The paper is intended to describe a method for the calculation of 3D viscous compressible (subsonic or supersonic) flow in axial turbomachines described in the form of thin-layer Reynolds averaged Navier-Stokes equations. The method draws on Godunov-type upwind differencing and ENO reconstruction suggested by Harten, so as to assure monotonicity preserving and high accuracy of
computational results. The computational efficiency is achieved thanks to the implementation of a simplified 11-type multi-grid approach and δ-form implicit step. Turbulent effects are simulated with the help of a modified algebraic model of Baldwin-Lomax. This method was at the foundation of a computer code a complex software package to calculate 3D flow in multi-stage turbomachines that
allows us to obtain local characteristics, like temperature, pressure, density or velocity distributions, as well as global characteristics, like flow rates, stage reaction. How efficiency for the considered turbine, compressor stage. The paper also gives selected results of computation of a number of turbimachinery cascades, showing that these results agree reasonably well with the available experimental data.