The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 2011
Filed:
Aug. 15, 2007
Shailendra Naik, Gebenstorf, CH;
Gregory Vogel, Palm Beach Gardens, FL (US);
Shailendra Naik, Gebenstorf, CH;
Gregory Vogel, Palm Beach Gardens, FL (US);
ALSTOM Technology Ltd., Baden, CH;
Abstract
A gas turbine airfoil () includes a pressure sidewall () and a suction sidewall (), extending from a root to a tip and from a leading edge region to a trailing edge and having at least one cooling passage between the pressure sidewall () and the suction sidewall () for cooling air to pass through and cool the airfoil from within. One or several of the cooling passages () extend along the leading edge of the airfoil () and several film cooling holes () extend from the internal cooling passages () along the leading edge region to the outer surface of the leading edge region. The film cooling holes () each have a shape that is diffused in a radial outward direction of the leading edge of the airfoil () at least over a part of the length of the film cooling hole (). Improved cooling in the leading edge region can be achieved because the cooling holes () have a principal axis (), and the shape is asymmetrically diffused in that it is diffused in the radial outward direction from the principal axis () along a forward inclination axis (), and it is additionally diffused in a second lateral direction from the principal axis () along a lateral inclination axis ().