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 Keywords
- Jet planes
Date of Defense 1989-05-05 Availability restricted AbstractA 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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