Method of casting to control the cooling air flow rate of the ai

Details Method of casting to control the cooling air flow rate of the ai Method of casting to control the cooling air flow rate of the ai

1991-10-07

1993-09-14

Batten, Jr., J. Reed

Metal working

Method of mechanical manufacture

Impeller making

29407, 298897, 164 41, 1641221, B22C 910, B23P 1502

Patent

active

052437590

ABSTRACT:
The flow rate of the cooling air at the trailing edge of the airfoil of a turbine blade for a gas turbine engine is established by casting the blade to include judiciously located radially spaced projections adjacent to or in the ribs in the trailing edge which serve to meter the flow in the channels formed between the ribs. The holes for forming the projections in the core that are used to form the internal cooling passages in the trailing edge are intentionally undersized. After the core is cleaned and flashed, the blade is cast in a mold and the ceramic core is leached out. The internal cooling passages in the trailing edge are flow tested to obtain the flow rate and pressure and this data is used to resize the projection. Resizing the projection is made by reforming the core with the same die, and with the information previously obtained in the flow test, the holes that form the projections are enlarged by drilling to obtain the desired flow rate. This process is repeated until the desired flow rate for each trailing edge channel is achieved. The die may be changed at this juncture to provide the ultimate dimensioned hole in the core to provide the necessary metering of the cooling air to attain the predetermined flow rate.

REFERENCES:
patent: 4358882 (1982-11-01), Wilkinson
patent: 4627480 (1986-12-01), Lee

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