Noise From Rotating Machinery
| Autor: | William K. Blake |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
020301 aerospace & aeronautics
Engineering business.industry Turbulence Rotor (electric) Propeller (aeronautics) Acoustics Rotation around a fixed axis 02 engineering and technology Inflow 01 natural sciences 010305 fluids & plasmas law.invention Physics::Fluid Dynamics Noise Axial compressor 0203 mechanical engineering law 0103 physical sciences Helicopter rotor business |
| DOI: | 10.1016/b978-0-12-809274-3.00006-4 |
| Popis: | This chapter focuses on the flow-acoustics of axial flow machinery from helicopter blades to automotive cooling fans. This chapter will consider the special acoustic considerations brought about by the rotational motion of the blades relative to the acoustic medium; that multiple flow excitations may coexist, providing varied spectral quality in different frequency ranges; the modifications of blade forces owing to the interactions of blades in the rotor with each other and with other blade rows; and the frequency–wave number matching of the rotor with ingested disturbances on the one hand and with acoustical modes of enclosures on the other. The chapter starts with an examination of the fundamental characteristics of unsteady loads and of noise from rotating vanes, before discussing the important performance features of rotating machinery. Free-field rotor noise and self-noise of blades will be described, as well as examining turbulent and deterministic blade interaction sounds due to nonuniform inflow, and the fundamental acoustics of ducted rotors and centrifugal fans. |
| Databáze: | OpenAIRE |
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