Title page for ETD etd-06102012-040559

Type of Document Master's Thesis
Author Nathani, Arun
URN etd-06102012-040559
Title A turbulent combustion noise model
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Mahan, James Robert Committee Chair
Roe, Larry A. Committee Co-Chair
Roby, Richard J. Committee Member
  • Jet planes
Date of Defense 1989-05-05
Availability restricted
A turbulent combustion noise model based on first principles is developed in this thesis.

The model predicts (1) the pressure time series, (2) Sound Pressure Level (SPL) spectrum,

(3) Over-All Sound Pressure Level (OASPL), (4) the thermoacoustic efficiency, (5)

the peak frequency, and (6) the sound power of combustion generated noise. In addition,

a correlation for sound power is developed based on fundamental burner and fuel

variables known to affect the acoustic characteristics of turbulent combustion. The

predicted pressure time series exhibits consistency with reality in that it has no steady

component. It also confirms speculation in the literature that the predominant noise

mechanism in open turbulent flames results from a "transition burning" phenomenon at

the flame front. The predicted Sound Pressure Level spectrum, Over-All Sound Pressure

Level, and the thermoacoustic efficiency are in excellent agreement with the results

available in the literature. The shifts in the peak frequency with basic burner and fuel

parameters are consistent with experimental observations from the literature. The disagreements

between the predicted and the observed exponents of fuel and burner parameters for sound power are shown to be well within the standard deviation of the

experimental observations. Certain areas for further analytical research on the combustion

noise mechanism are identified.

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