Publicado 6 números por año
ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678
Indexed in
CARS MEASUREMENTS OF TEMPERATURE FLUCTUATIONS IN A HIGH PRESSURE GAS TURBINE COMBUSTOR
SINOPSIS
A mobile CARS system has been used to determine temperatures and their fluctuations in a high-pressure combustion test rig with a maximum thermal power of 8 MW. Probability density functions of the temperature, each based on 1000 single-shot measurements, have been determined at different radial and axial locations within the combustion chamber in turbulent natural gas and oil flames up to a pressure of 14 bar. Analysis of the frequency spectrum of the temperature probability density functions reveals periodic fluctuations of the flame.
A high degree of turbulence, an increased pressure together with an extended size of the combustion chamber caused beam propagation effects to become a serious problem for this measuring technique. Temperature determinations in sooty oil flames became even more difficult due to the strong absorption of a part of the fundamental band of the N2 CARS spectrum by C2 radicals.