Accession Number : AD0282273

Title :   EXPERIMENTAL AND THEORETICAL STUDIES OF JET NOISE PHENOMENA.

Descriptive Note : Final rept. Mar 61-Feb 62,

Corporate Author : ARMOUR RESEARCH FOUNDATION CHICAGO ILL

Personal Author(s) : Sperry ,W. C. ; Kamo ,R. ; Peter,A.

Report Date : JUN 1962

Pagination or Media Count : 163

Abstract : Over-all sound pressure levels were measured in an anechoic room for noise generated by cold air flow through more than twenty different nozzle configurations including converging, converging-diverging, slot, and annular types, the latter with and without center core flow. The results are examined in terms of over-all acoustic power and directivity versus mass flow and compared with various eighth power relations. The acoustic performance of most nozzles was similar in the subsonic region. However, certain annular type nozzles exhibited a marked superiority in the supersonic region. Theoretical discussions are presented concerning the generation of sound and the relationship between various turbulence and statistical theories. A modified mixing length theory is developed showing its application to turbulence generation as well as its influence on the general forcing function equation. Temperature effects are included. Empirical data are given pertaining to the correlation of jet noise from circular and annular nozzles. (Author)

Descriptors :   *EXHAUST NOZZLES, *JET ENGINE NOISE, ACOUSTICS, AERODYNAMIC CONFIGURATIONS, ANNULAR NOZZLES, CONFIGURATION, EXHAUST GASES, GAS FLOW, JET ENGINES, MATHEMATICAL ANALYSIS, NOZZLES, PLUG NOZZLES, PRESSURE, SOUND, STATISTICAL ANALYSIS, TEMPERATURE, TESTS, THEORY, TURBULENCE

Distribution Statement : APPROVED FOR PUBLIC RELEASE