How to achieve high levels of excitation in the fuel line of a pressurized combustor

Mehmet Kapucu*, Jim B W Kok

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    The Flame Transfer Function (FTF) is a well-studied key function describing the transient linear in amplitude coupling between aerodynamics and combustion and is used in predicting acoustic stability of a combustor system. However in case of an instability with positive growth rate, the amplitudes rapidly change and the FTF becomes dependent on amplitude; therefore the combustion- aerodynamics coupling becomes nonlinear. Hence for this situation non linearity must be taken into account. A nonlinear description of the flame dynamics can be investigated by increasing the perturbation levels of the aerodynamics upstream of the flame. The flame dynamic is best measured by determining the response of the flame to fluctuations in the fuel mass flow at the burner exit. With this method it is necessary to know the transfer between the fuel flow oscillating device and the mass flow at the burner exit. This fuel line transfer function describes the relationship between (fuel) mass flow fluctuations at the location of fuel injection and the oscillating device. Challenge is to design a fuel line which allows the maximum transfer of the perturbations through fuel injection nozzles. Therefore an investigation has been made to design the optimum fuel line and nozzle combination. Numerical calculations are performed with the commercial code ANSYS CFX 13.0. Variation of different parameters like length and diameter of the fuel line and number and diameter of nozzles are considered. Effect of these parameters on the mixing and propagation of acoustic is discussed.

    Original languageEnglish
    Title of host publication19th International Congress on Sound and Vibration 2012, ICSV 2012
    Pages2089-2096
    Number of pages8
    Volume3
    Publication statusPublished - 1 Dec 2012
    Event19th International Congress on Sound and Vibration, ICSV 2012 - Vilnius, Lithuania, Vilnius, Lithuania
    Duration: 8 Jul 201212 Jul 2012
    Conference number: 19
    http://icsv19.org/

    Conference

    Conference19th International Congress on Sound and Vibration, ICSV 2012
    Abbreviated titleICSV
    CountryLithuania
    CityVilnius
    Period8/07/1212/07/12
    Internet address

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