Accession Number : ADP007697

Title :   Unsteady Euler Calculations in 3D Internal Aerodynamics,

Corporate Author : NATIONAL TECHNICAL UNIV ATHENS (GREECE) LAB OF THERMAL TURBOMACHINES

Personal Author(s) : Hadzidakis, M. ; Karagiannis, F. ; Chaviaropoulos, P. ; Papailiou, K. D.

Report Date : FEB 1992

Pagination or Media Count : 8

Abstract : This paper presents an implicit finite difference algorithm which solves the unsteady Euler equations in three dimensional ducts. The present work is based on the Helmholtz decomposition of the unsteady velocity field into a potential and a rotational part. The geometry does not change with time, thus the unsteady nature of the flow is due to the time dependent inflow and outflow boundary conditions. The flow at the inlet is supposed to be rotational. Vorticity is introduced by means of velocity, total enthalpy or even entropy profile slope. The presented results cover a wide range of reduced frequencies in the subsonic flow regime.

Descriptors :   *DUCTS, *THREE DIMENSIONAL FLOW, ALGORITHMS, BOUNDARIES, DECOMPOSITION, ENTHALPY, ENTROPY, EQUATIONS, FLOW, GEOMETRY, INLETS, PAPER, PROFILES, SLOPE, SUBSONIC FLOW, TIME, VELOCITY, WORK, COMPUTATIONS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE