NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Multiple pure tone noise generated by fans at supersonic tip speedsThe existence of clusters of pure tones at integral multiples of shaft speed has been noted for supersonic-tip-speed operation of fans and compressors. A continuing program to explore this phenomenon, often called combination-tone noise, has been in effect for several years. This paper reviews the research program, which involves a wide range of engines, compressor rigs, and special apparatus. Elements of the aerodynamics of the blade-associated shock waves are outlined and causes of blade-to-blade shock inequalities, responsible for the multiple tones, are described.
Document ID
19750003121
Document Type
Conference Paper
Authors
Sofrin, T. G. (Pratt and Whitney Aircraft East Hartford, CT, United States)
Pickett, G. F. (Pratt and Whitney Aircraft East Hartford, CT, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1974
Publication Information
Publication: Pennsylvania State Univ. Fluid Mech., Acoustics, and Design of Turbomachinery, Pt. 2
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19750003121.pdf STI

Related Records

IDRelationTitle19750003119Analytic PrimaryFluid mechanics, acoustics, and design of turbomachinery, part 2