Accession Number : ADP005516

Title :   Transonic Three-Dimensional Inviscid Calculations in Turbomachines,

Corporate Author : POLITECNICO DI MILANO (ITALY)

Personal Author(s) : Bassi,F. ; Savini,M.

Report Date : MAR 1987

Pagination or Media Count : 10

Abstract : This paper describes a finite volume Euler solver which has been applied to the calculation of the three-dimensional transonic flow field through straight cascades. The numerical algorithm, based on Jameson's approach, uses a centered space discretization, with explicit adaptive dissipation terms, and a three stage Runge Kutta method for the time integration; the convergence to the steady state solution may be enhanced by using local time step, residual smoothing, and enthalpy damping. The calculations were performed in a O-type grid, obtained by means of a constructive approach which guarantees good properties of smoothness, orthogonality, and resolution near the body. The computational code has been applied to two turbine blade cascades in transonic regime tested at von Karman Institute. Three-dimensional effects were introduced by imposing an inlet velocity profile normal to the endwall. The computational results show good agreement with the blades pressure experimental data and the code performed well in the prediction and development of the secondary flow vortices.

Descriptors :   *TRANSONIC CHARACTERISTICS, *TURBOMACHINERY, THREE DIMENSIONAL FLOW, VISCOUS FLOW, RUNGE KUTTA METHOD, VORTICES, SECONDARY FLOW, NUMERICAL METHODS AND PROCEDURES, NAVIER STOKES EQUATIONS, TURBULENT FLOW, ITALY

Subject Categories : Fluid Mechanics
      Hydraulic and Pneumatic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE