Hollow rotor blade of columnar structure having a single crystal

Details Hollow rotor blade of columnar structure having a single crystal Hollow rotor blade of columnar structure having a single crystal

1999-06-21

2000-08-15

Ryan, Patrick

Electric heating

Metal heating

By arc

21912185, 2191217, 21912182, B23K 2600

Patent

active

061039934

ABSTRACT:
A hollow structural part having an internal hollow space, preferably a blade for a turbodrive, is made of a metal alloy with a columnar structure solidified in an oriented manner with longitudinally extending grain boundaries. A series of holes are laser drilled in the blade to connect the outer surface of the blade with the hollow space. The blade is formed with a single crystal column in the region where the series of holes are formed so that the holes are away from the grain boundaries. Such structural parts are preferably used as the blade of a rotor and the laser drilled holes serve for supply of cooling air to the leading edge or pressure region of the blade or for influencing the position of the boundary layer on the suction side of the blade, or the laser-drilled holes are shaped as outflow openings for air to intensify a cooling film for increasing the blade efficiency.

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Metals Handbook, 9.sup.th Ed, vol. 15, "Nickel and Nickel Alloys" pp 815-819, 1988.
CA 124:34 9646 of "Laser Drilling of Advanced Materials: effects of Peak Power, pulse format and wave length." 1995.

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