Film cooling effectiveness measurements with injection of air through discrete holes into a turbulent boundary layer of air on a flat plate are described. The secondary air is injected through either a single hole or a row of holes spaced at 3 diam intervals across the span with an injection angle of 35//0 to the flow and in a different series of tests through a single hole with lateral injection angles of either 15 or 35//0. Results are compared with earlier tests to show that the film cooling effectiveness increases as the boundary layer thickness at the injection location is decreased. ltea inction spreads the protection by the cooling film over a wider area than when injection is normal to the flow or inclined downstream only.
|Original language||English (US)|
|Number of pages||10|
|Journal||Isr J Technol|
|State||Published - Jan 1 1970|