Title page for ETD etd-07262000-18360041


Type of Document Dissertation
Author Fannin, Christopher A.
URN etd-07262000-18360041
Title Linear Modeling and Analysis of Thermoacoustic Instabilities in a Gas Turbine Combustor.
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Saunders, William R. Committee Chair
Baumann, William T. Committee Member
Chelliah, Harsha Committee Member
Robertshaw, Harry H. Committee Member
Vandsburger, Uri Committee Member
Keywords
  • time delay
  • stability
  • acoustic
  • heat release
Date of Defense 2000-07-25
Availability unrestricted
Abstract
A dynamic model is developed for the purpose of predicting stability characteristics of an industrial-scale, swirl-stabilized premixed combustor located at the National Energy Technology Laboratory (NETL) in Morgantown, WV. The model consists of modular blocks that assemble into an open-loop transfer function depicting the frequency response of the thermoacoustic system. These blocks include the system acoustic response to unsteady heat release forcing, the air-side coupling of acoustic particle velocity to inlet fuel mass fraction, transport delays present in the mixing nozzle and combustion chamber, and dynamic heat release excitation from unsteady inlet fuel mass fraction. By examing the frequency response with linear stability techniques, the existence of limit cycles due to linear instabilities is predicted. Further, the frequency response analysis is used to predict limit cycle frequencies in the case of predicted instability. The analysis predictions are compared with the results of tests performed at NETL, demonstrating a capability of replicating many of the observed stability characteristics.
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