Aerodynamic noise in aircraft and wind tunnels

Irani, PA and Iya, Sridhar K (1963) Aerodynamic noise in aircraft and wind tunnels. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    The modern trend towards high engine power and large13; aeronautical test facilities has resulted in a tremendous13; increase in the generation of noise and consequently the13; problem of noise control in aircraft and wind tunnels has13; become one of increasing importance in recent years. The13; high noise levels are not only a source of annoyance to13; people working, in the vicinity, but also in many cases cause structural damage and malfunctioning of equipment.13; In aviation and aircraft industry the people who are most affected by noise are turbo-jet manufacturers, service crews, occupants of the aircraft, N-wind tunnel operators and communities near, airports and test facilities. The high cost and effort required to provide adequate protection for these people demand a detailed study of the characteristics of various aircraft noise sources, the magnitude of the noise, the nature of the source and the effect of operating conditions on these characteristics, quot;Aerodynamic noisequot; is the noise generated as a byproduct of an unsteady turbulent airflow, or noise produced without participation of solid boundaries. Examples of sources of such noise are* air jets, boundary layers, vortices 9 wakes and related phenomena* Before embarking on a general discussion of these phenomena, some of the basic terms used in acoustic theory and measurement are defined in the next section.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Aerodynamic noise in Aircraft;Wind tunnels;Jet velocity;Rockets;Ram jets
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Aerodynamics, Aerodynamics
    Depositing User: M/S ICAST NAL
    Date Deposited: 28 Nov 2006
    Last Modified: 24 May 2010 09:53
    URI: http://nal-ir.nal.res.in/id/eprint/3508

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