Calculations of the dilution system in an annular gas turbine combustor

• Type: Article in International Scientific Journal
• Date: 1992

Authors

McGuirk, JJ (Author) Other; José Laginha Palma (Author) FEUP

Journal

Title: AIAA Journal

Vol. 30

Pages: 963-972

ISSN: 0001-1452

Publisher: American Institute of Aeronautics and Astronautics

Indexing

Scopus - 10 Citations

Other information

Authenticus ID: P-008-P1J

Abstract (EN): The present work is concerned with the ability of a two-equation turbulence model (k-¿) of predicting accurately the mixing parameters at the outlet of an annular gas turbine combustor. A comparison between numerical and experimental results is presented with attention paid to numerical accuracy and boundary condition sensitivity. A numerical grid with 36,000 nodes was needed to resolve the flow inside a 7.5-deg annular sector. It was found that an insufficient number of grid nodes led to the underprediction of the streamwise vorticity and a different flow pattern in the wake and downstream of the jets. Two basic sets of calculations with constant and variable density are included. The calculations could predict the general features of the flow, but evidenced lower levels of mixing compared to the experiments, even with a reduction of the turbulent Prandtl number from 0.9 to 0.5.

Language: English

Type (Professor's evaluation): Scientific