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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

DISCRETE-HOLE FILM COOLING CHARACTERISTICS OVER CONCAVE AND CONVEX SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC8.2230
pages 1297-1301

Аннотация

The local film cooling effectiveness and local pressure distribution for single row discrete holes have been measured extensively over the whole areas of concave and convex surfaces.
It has been found that the recirculation is stronger on convex surface than on concave surface even at low blowing ratio of M = 0.5. The direction of recirculation near the ejection hole on concave surface is opposite to that on convex surface.
Experimental results show that the concave surface has wider film coverage in the z-direction. Consequently the distance between cooling holes on the convex surface should be smaller than on the concave surface. And on the other hand, the convex surface has higher film cooling effectiveness near the ejection hole. Higher blowing ratio, e.g. M = 1, will cause stronger recirculation, thus reducing cooling effects.