Accession Number:

AD0657159

Title:

FEASIBILITY OF A DIRECT EXPERIMENTAL TEST OF LIGHTHILL'S THEORY OF AERODYNAMIC SOUND USING FOCUSING TECHNIQUES,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1957-07-18

Pagination or Media Count:

33.0

Abstract:

A direct experimental test of Lighthills theory of aerodynamically generated sound is found to be feasible if a suitable focusing device is used. By sampling the sound from a single correlation volume only, major theoretical problems could be overcome. Calculations were made for the case of sound produced in a single correlation volume in the downstream portion of an experimentally realizable subsonic jet. These show that the power level and frequency spectrum of the acoustic signal should be of such a nature that they could be adequately handled by the apparatus described. Author

Subject Categories:

  • Aerodynamics
  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE