Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Patent
1986-11-13
1988-08-09
Garrett, Robert E.
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
291568H, 219 69R, F01D 518
Patent
active
047624647
ABSTRACT:
Air cooling of airfoils in a gas-turbine engine is effected through holes which terminate with a diffuser formation at the airfoil surface. The invention is directed to a two-step procedure whereby a laser beam drills the holes very quickly and cost-effectively and whereby an EDM step is relied upon only to form the diffuser shape. The EDM part of the procedure thus occupies but a fraction of the time previously required, and substantial overall economy is realized by integrating these two steps, which are preferably performed in the order stated but which, if desired, may alternatively be performed by laser driling after EDM formation of the diffuser shape.
REFERENCES:
patent: 3538289 (1970-11-01), Burnet et al.
patent: 3981786 (1976-09-01), Andrews
patent: 4197443 (1980-04-01), Sidenstick
patent: 4650949 (1987-03-01), Field
patent: 4653983 (1987-03-01), Vehr
patent: 4664597 (1987-05-01), Auxier et al.
Mosavi Reza K.
Vertz Richard J.
Chromalloy Gas Turbine Corporation
Garrett Robert E.
Kwon John T.
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