Accession Number:

ADA175473

Title:

Generation of a Composite Grid for Turbine Flows and Consideration of a Numerical Scheme.

Descriptive Note:

Technical rept.,

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s):

Report Date:

1986-11-01

Pagination or Media Count:

22.0

Abstract:

A composite grid was generated for flows in turbines. It consisted of the C-grid or O-grid in the immediate vicinity of the blade and the H-grid in the middle of the blade passage between the C-grids and in the upstream region. This new composite grid provides better smoothness, resolution, orthogonality than any single grid for a typical turbine blade with a large camber and rounded leading and trailing edges. The C-H or O-H composite grid has an unusual grid point that is connected to more than four neighboring nodes in two dimensions more than six neighboring nodes in three dimensions. A finite-volume lower-upper LU implicit scheme to be used on this poses no problem and requires no special treatment because each interior cell of this composite grid has only four neighboring cells in two dimensions six cells in three dimensions. The LU implicit scheme was demonstrated to be efficient and robust for external flows in a broad flow regime and can be easily applied to internal flows and extended from two to three dimensions.

Subject Categories:

  • Fluid Mechanics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE