Analytical Models for Nearfield Jet Noise Calculations
Abstract
Three analytical models for near field noise calculation are formulated for subsonic and supersonic jet flows. Evaluation of these models in comparison with nearfield noise measurements from a full scale jet engine and scale model hot jets is presented. The use of compositions of different quadrupoles as prediction models is demonstrated. The effect of initial turbulence level on the near noise field was studied by the use of the analytical models. The results of the study indicate that an increase of the turbulence level in the jet exit plane causes an increase in sound pressure level for high frequencies. The effect of the turbulence level is negligible for low frequency sound. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 06, 1972
- Accession Number
- ADA109278
Entities
People
- C. Y. Chen
Organizations
- General Electric