Study on Combustion Oscillation of Premixed Flame with Pilot Fuel at Elevated Pressures

Acoustically-coupled combustion oscillation is studied for premixed flame with pilot fuel to be used in gas turbine combustors. Premixed gas is passed through swirl vanes and burnt with the centrally injected pilot fuel. The dependencies of pressure, fuel to air ratio, premixed fuel rate, inlet velo...

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Bibliographic Details
Published in:Journal of Thermal Science and Technology 2009, Vol.4(1), pp.74-85
Main Authors: OHTSUKA, Masaya, YOSHIDA, Shohei, HIRATA, Yoshitaka, KOBAYASHI, Nariyoshi
Format: Article
Language:English
Subjects:
Combustion Oscillation
Elevated Pressure
Flame Length
Pilot Fuel
Premixed Flame
Premixed Fuel Rate
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Summary:Acoustically-coupled combustion oscillation is studied for premixed flame with pilot fuel to be used in gas turbine combustors. Premixed gas is passed through swirl vanes and burnt with the centrally injected pilot fuel. The dependencies of pressure, fuel to air ratio, premixed fuel rate, inlet velocity and air temperature on the combustion oscillation are investigated. Two kinds of oscillation modes of ∼100Hz and ∼350Hz are activated according to inlet velocities. Fluctuating pressures are amplified when the premixed fuel rate is over ∼80% at elevated pressures. The fluctuating pressure peak moves to a higher premixed fuel ratio region with increased pressure or fuel to air ratio for the Helmholz type mode. Combustion oscillation occurs when the pilot fuel velocity is changed proportionally with the flame length.
ISSN:1880-5566
1880-5566
DOI:10.1299/jtst.4.74