Method of making a row of mix-tuned turbomachine blades

Details Method of making a row of mix-tuned turbomachine blades Method of making a row of mix-tuned turbomachine blades

1994-09-26

1996-06-11

Cuda, Irene

Metal working

Method of mechanical manufacture

Impeller making

2988921, 2988922, B23P 1500

Patent

active

055243410

ABSTRACT:
A row of mix-tuned rotor blades for use in a turbomachine in which the first mode vibratory frequency of each of the blades falls into either of two distinct groups. The blades from the first group alternate with the blades from the second group so that no two adjacent blades have the same frequency, thereby inhibiting the onset of stall flutter. The blades are made by forging a forging blank between upper and lower die halves. The orientation of the upper die half relative to the lower die half when the die is fully closed is different depending on whether blades are being made for the first or second group, the difference being an offset in the position of the upper die half. As a result, the airfoils of the blades in the first and second groups have slightly different shapes, thereby resulting in the difference in resonant frequency.

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