Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Patent
1997-02-24
1998-07-28
Verdier, Christopher
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
416191, 416192, F01D 518
Patent
active
057854963
ABSTRACT:
A gas turbine rotor blade includes a shroud which is cooled effectively with cooling gas used for cooling the blade profile so that the temperature of the shroud is reduced and the life of the gas turbine rotor blade is extended. A two-step groove is engraved in the shroud along the tip of the blade profile and the upper portion of the two-step groove is plugged. Second cooling holes are bored along the direction of the plane of the shroud so as to be connected to and communicate with the first cooling holes which are bored in the blade profile in a direction along the longitudinal axis of the blade for passing cooling gas through the blade. Consequently, most of the cooling gas, after cooling the blade profile, can be used for cooling the shroud, so that the shroud is cooled effectively and the temperature thereof is prevented from rising. Preventing the temperature from rising can also prevent reduction of the creep resistance of the shroud and prevent the blade root on the shroud from being turned up.
REFERENCES:
patent: 1651503 (1927-12-01), Belluzzo
patent: 4940388 (1990-07-01), Lilleker et al.
patent: 4948338 (1990-08-01), Wickerson
patent: 5460486 (1995-10-01), Evans et al.
patent: 5482435 (1996-01-01), Dorris et al.
patent: 5531568 (1996-07-01), Broadhead
Mitsubishi Heavy Industries Ltd.
Verdier Christopher
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