Compressor with asymmetric stator and acoustic cutoff
First Claim
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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.
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Abstract
A method of manufacturing a compressor section includes the steps of defining a compressor section having a number of blades, and having one or more stator sections, each with numbers of vanes. Each stator section has at least two sections wherein the 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. The number of blades, and the number of vanes where all of the sections are selected to achieve acoustic cutoff.
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Citations
10 Claims
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1. A method of manufacturing a compressor section comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A compressor comprising:
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a rotor having a plurality of blades; at least one stator section having a plurality of vanes, with there being at least two subsections to each stator section, and a spacing between said vanes in a first of said subsections is unequal to a spacing between vanes in a second of said subsections, and the number of vanes being selected in combination with the number of blades in the rotor to achieve cutoff; 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. - View Dependent Claims (7, 8, 9, 10)
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Specification