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General Electric : Findings in the Area of Power Engineering Reported from General Electric Company (The Effect of Fuel Staging on the Structure and Instability...

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12/07/2017 | 10:45 pm

Findings in the Area of Power Engineering Reported from General Electric Company (The Effect of Fuel Staging on the Structure and Instability Characteristics of Swirl-Stabilized Flames in a Lean Premixed Multinozzle Can Combustor)

By a News Reporter-Staff News Editor at Energy Weekly News -- Fresh data on Engineering - Power Engineering are presented in a new report. According to news reporting out of Niskayuna, New York, by VerticalNews editors, research stated, "Fuel staging is a commonly used strategy in the operation of gas turbine engines. In multinozzle combustor configurations, this is achieved by varying fuel flow rate to different nozzles."

Our news journalists obtained a quote from the research from General Electric Company, "The effect of fuel staging on flame structure and self-excited instabilities is investigated in a research can combustor employing five swirl-stabilized, lean-premixed nozzles. At an operating condition where all nozzles are fueled equally and the combustor undergoes a self-excited instability, fuel staging successfully suppresses the instability: both when overall equivalence ratio is increased by staging as well as when overall equivalence ratio is kept constant while staging. Increased fuel staging changes the distribution of time-averaged heat release rate in the regions where adjacent flames interact and reduces the amplitudes of heat release rate fluctuations in those regions. Increased fuel staging also causes a breakup in the monotonic phase behavior that is characteristic of convective disturbances that travel along a flame. In particular, heat release rate fluctuations in the middle flame and flame-flame interaction region are out-of-phase with those in the outer flames, resulting in a cancelation of the global heat release rate oscillations. The Rayleigh integral distribution within the combustor shows that during a self-excited instability, the regions of highest heat release rate fluctuation are in phase-with the combustor pressure fluctuation."

According to the news editors, the research concluded: "When staging fuel is introduced, these regions fluctuate out-of-phase with the pressure fluctuation, further illustrating that fuel staging suppresses instabilities through a phase cancelation mechanism."

For more information on this research see: The Effect of Fuel Staging on the Structure and Instability Characteristics of Swirl-Stabilized Flames in a Lean Premixed Multinozzle Can Combustor. Journal of Engineering for Gas Turbines and Power-Transactions of the ASME, 2017;139(12):42-51. Journal of Engineering for Gas Turbines and Power-Transactions of the ASME can be contacted at: Asme, Two Park Ave, New York, NY 10016-5990, USA.

Our news journalists report that additional information may be obtained by contacting J. Samarasinghe, GE Global Res, Niskayuna, NY 12309, United States. Additional authors for this research include W. Culler, B.D. Quay, D.A. Santavicca and J. O'Connor.

Keywords for this news article include: Niskayuna, New York, United States, North and Central America, Power Engineering, Engineering, General Electric Company.

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