Patent ID: 8534991
Filing Date: 2013-09-17
Classification: F01D,F04D,F05D,Y10T

Abstract:
1. A method of manufacturing a compressor section comprising the steps of: defining a compressor section having a first number of blades, and at least one stator section having a number of vanes, with each stator section having at least two sections wherein a spacing between the vanes in a first of the sections is not equal to a spacing between the vanes in a second of the sections; selecting the number of blades, and the number of vanes in at least one of the sections to achieve cutoff; and a minimum absolute value for a quantity m is utilized to calculate whether the compressor will achieve cutoff, and wherein m=nB−2 kV, wherein V is equal to the number of vanes in the one of the two subsections, n is the blade passing frequency harmonic, which is an integer, B is the number of blades, and k is a vane passing frequency harmonic order, which is an integer.