Influence of mixer nozzle velocity decay characteristics on CTOL-OTWjet noise shielding | Zendy

U. VON GLAHN | Zendy; D. Groesbeck | Zendy

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Influence of mixer nozzle velocity decay characteristics on CTOL-OTWjet noise shielding

Author(s) -

U. VON GLAHN,

D. Groesbeck

Publication year - 1975

Publication title -

29th aerospace sciences meeting

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.1975-97

Subject(s) - electromagnetic shielding , nozzle , jet (fluid) , conical surface , attenuation , noise (video) , materials science , mechanics , jet noise , acoustics , optics , physics , composite material , thermodynamics , image (mathematics) , artificial intelligence , computer science

Jet noise shielding benefits for CTOL engine-over-the-wing configurations were obtained with model scale multitube and lobed mixer nozzles and various shielding surface geometries. Spectral data were obtained with jet velocities from 585 to 1110 ft/sec. Correlation equations for predicting jet noise shielding benefits with single conical nozzle installations were modified to correlate the mixer nozzle data. The modification included consideration of the number of nozzle elements and the peak axial velocity decay in the flow field adjacent to the shielding surface. The effect of forward velocity on jet noise attenuation by a shielding surface is discussed.

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