Combustion Noise Prediction: Entropy/Vorticity Effects.

Abstract

An experimental and theoretical program was conducted to see if entropy noise and vorticity-nozzle interaction noise, as well as direct combustion noise, could be isolated in gas turbine combustor tests. Moreover, a unified correlation, with a rational theoretical basis, was developed for direct noise from combustor rig tests. It was found that (a) vorticity noise was at least as large as combustion noise; (b) entropy noise is minor but is large only at low frequency; (c) all noise sources are coherent with each other over various frequency ranges; (d) with a choked nozzle termination the nose is higher frequency (approximately 2000 Hz) than heretofore believed; (e) some other unexplained noise source contaminated the results at low frequency; and (f) the diffuser used caused additional coherent noise, probably through the vorticity source. A method for accounting for the vorticity and entropy sources in combustor rig tests was indicated. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1979
Accession Number
ADA067993

Entities

People

  • Douglas H. Neale
  • M. Muthukrishnan
  • Suresh K. Aggarwal
  • Warren C. Strahle

Organizations

  • Georgia Tech

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Combustion
  • Data Analysis
  • Frequency Bands
  • Gas Turbines
  • Heat Transfer
  • Mach Number
  • Measurement
  • Pressure Distribution
  • Pressure Gradients
  • Pressure Measurement
  • Regression Analysis
  • Three Dimensional
  • Turbines

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Combustion and Flow Dynamics.
  • Theoretical Analysis.