Curved film cooling admission tube

Fluid reaction surfaces (i.e. – impellers) – Method of operation

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415115, 416 97R, B64C 2700, F01D 508

Patent

active

043848230

ABSTRACT:
The object of the invention is to provide more effective film cooling to protect a wall surface from a hot fluid which impinges on or flows along the surface. A film of cooling fluid having increased area is provided by changing the direction of a stream of cooling fluid through an angle of from 135.degree. to 165.degree. before injecting it through the wall into the hot flowing gas.
As shown in FIG. 1, cooling fluid is injected from an orifice (16) through a wall (10) into a hot flowing gas (11) at an angle (20) to form a cooling fluid film (12). Cooling fluid is supplied to the orifice (16) from a cooling fluid source (13) via a turbulence control passageway (14) having a curved portion (18) between two straight portions (17 and 19).
The angle (24) through which the direction of the cooling fluid is turned results in less mixing of the cooling fluid with the hot gas (11), thereby substantially increasing the length of the film (12) in a downstream direction.
FIGS. 2, 3, 4 and 5 illustrate specific applications of the invention.

REFERENCES:
patent: 3388888 (1968-06-01), Kercher et al.
patent: 3589128 (1971-06-01), Sweet
patent: 3605412 (1971-09-01), Stockel
patent: 3978662 (1976-09-01), Dubell et al.
patent: 4021139 (1977-05-01), Franklin
patent: 4056332 (1977-11-01), Meloni
patent: 4270883 (1981-06-01), Corrigan
patent: 4314442 (1982-02-01), Rice

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