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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Film cooling effectiveness for a single row of discrete injection holes - influence of hole orientation, shape and blowing rate

Get access (open in a dialog) DOI: 10.1615/IHTC12.1050
6 pages

Sinopsis

This paper presents detailed local film cooling effectiveness distributions on a film-cooled plate with different hole geometries and blowing rates. The five geometries used for the injection hole include variations of two parameters: compound angle from 0° to 60° and uniform diameter injection hole or non-uniform (expansion or shaped) holes. The blowing rate is varied from 0.5 to 2.0.
For film cooling effectiveness, effectiveness is calculated for mass transfer coefficients from pure and naphthalene saturated air injection. Compound angle increases film cooling effectiveness over the whole domain for all blowing rates. As blowing rate increases, the effectiveness generally decreases in a given geometry. Expansion hole injection shows better average effectiveness than straight holes injection without expansion. The 60° compound angle holes with expansion and shaped holes show the highest film cooling effectiveness for all blowing rate.