Abb Research Ltd.

Alstom (switzerland) Ltd

Bernhard Bonhoff

Alexander Beeck

Bernhard Weigand

Sacha Parneix

G&uuml;nter Wilfert

Arrangement for cooling a flow-passage wall surrrounding a flow passage, having at least one rib element

A cooling wall comprises an outer surface, which is exposed to a hot-gas flow, an inner surface, and at least one film-cooling hole within the wall, which film-cooling hole has a diffuser section and an outlet at the outer surface. The diffuser section has first and second internal surfaces, the intersection edge between the first internal surface and the outer surface forming an upstream edge of the outlet, and the intersection edge between the second internal surface and the outer surface forming a downstream edge of the outlet. The diffuser section has side surfaces, which faces one another, connect the first and second internal surfaces and diverge from one another toward the outlet of the diffuser section. The first internal surface of the diffuser section is rounded toward the axis of the film-cooling hole.

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Baden, Switzerland

Bernhard Bonhoff