Combustion instabilities in Gas Turbine

The increasingly strict regulation for pollutant emissions has recently led engine manufacturers to develop combustors that meet various regulatory requirements. Lean-premixed combustion appears to be the most promising technology for practical systems at the present time. In lean-premixed combustion, the fuel and air are premixed upstream of the combustor to avoid the formation of stoichiometric regions. The combustor is operated with excess air to reduce the flame temperature; consequently, thermal NOx is virtually eliminated. Unsteady flow oscillations, also referred to as combustion instability, have emerged as a common problem, and hindered the development of lean-premixed combustors. These oscillations may reach sufficient amplitudes to interfere with engine operation, and in extreme cases, lead to failure of the system due to excessive structural vibration and heat transfer to the chamber. The book is organized in two parts: an extensive bibliographic review of combustion instabilities and the motivation of this work in part 1; and the study about a new diagnostic methodology for thermoacoustic instability detection and future control in part 2.

Autorentext

Emanuele Giulietti was born in Rome on 01/03/1975. He graduates in Mechanical Engineering in 2002, and he takes his Ph.D. in Mechanical and Industrial Engineering at the University of "Roma Tre" in Rome. He currently works as a researcher at the Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA).