Harvey H. Hubbard

Theory and Practice

Aeroacoustics of Flight Vehicles

Aeroacoustics of Flight Vehicles: Noise control

Domenic J. Maglieri

David A. Hilton

Noise Considerations in the Design and Operation of V/STOL Aircraft

Sound-pressure measurements are reported for five shrouded propellers and are compared with those for an unshrouded propeller operating at approximately the same rotational speed and power. The maximum total sound pressure produced by a two-blade shrouded propeller is found to vary approximately from one-half to twice as much as that for an unshrouded two-blade propeller, depending on whether the flow at the shroud surface is unseparated or separated, respectively. Shroud chord is found not to be critical except insofar as the areodynamic considerations are affected. In general, if the shroud-propeller unit satisfies aerodynamic requirements, good sound characteristics will also be obtained.

Sound Measurements for Five Shrouded Propellers at Static Conditions

Aeroacoustics of Flight Vehicles: Noise sources

Leslie W. Lassiter

Choked operation of model jets with unheated air indicates the appearence of a discrete-frequency component of very large magnitude. Shadowgraph records of the flow show that this condtion is associated with the appearance of flow formations suggestive of partly formed toroidal vortices in the vicinity of the shocks. Elimination of these formations is found to eliminate the discrete component and thereby to reduce the overall noise level.

The Near Noise Field of Static Jets and Some Model Studies of Devices for Noise Reduction

United States. National Advisory Committee for Aeronautics

A. E. Potter

Alfred Gessow

Bernard Lubarsky

Harry L. Runyan

Kenneth Margolis

M. J. Queijo

Richard E. Kuhn

Robert L. Trimpi

A. P. Young

Donald S. Woolston

John W. Draper

Percy J. Bobitt

Robert J. Tapscott

Samuel J. Kaufman

A. D. Schwope

A. Gerald Rainey

Theoretical and Experimental Investigation of the Effect of Tunnel Walls on the Forces on an Oscillating Airfoil in Two-dimensional Subsonic Compressible Flow

Harvey H. Hubbard

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