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Title: Combustor oscillation pressure stabilizer

Abstract

In accordance with the objective of the present invention, the active control of unsteady combustion induced oscillations in a combustion chamber fired by a suitable fuel and oxidizer mixture, such as a hydrocarbon fuel and air mixture, is provided by restructuring and moving the position of the main flame front and thereby increasing the transport time and displacing the pressure wave further away from the in-phase relationship with the periodic heat release. The restructuring and repositioning of the main flame are achieved by utilizing a pilot flame which is pulsed at a predetermined frequency corresponding to less than about one-half the frequency of the combustion oscillation frequency with the duration of each pulse being sufficient to produce adequate secondary thermal energy to restructure the main flame and thereby decouple the heat release from the acoustic coupling so as to lead to a reduction in the dynamic pressure amplitude. The pulsating pilot flame produces a relatively small and intermittently existing flame front in the combustion zone that is separate from the oscillating main flame front but which provides the thermal energy necessary to effectively reposition the location of the oscillating main flame front out of the region in the combustion zonemore » where the acoustic coupling can occur with the main flame and thereby effectively altering the oscillation-causing phase relationship with the heat of combustion.« less

Inventors:
; ; ; ; ;
Publication Date:
Research Org.:
EG and G Technical Services of West Virginia, Inc., Morgantown, WV (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
OSTI Identifier:
595623
Patent Number(s):
PATENTS-US-A8644609
Application Number:
ON: DE98004840; PAN: 8-644,609; TRN: AHC29810%%9
Assignee:
US Dept. of Energy, Washington, DC (United States) NETL; SCA: 025000; 421000; PA: EDB-98:041651; SN: 98001932981
DOE Contract Number:
AC21-90MC26328
Resource Type:
Patent Application
Resource Relation:
Other Information: PBD: [1996]
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; COMBUSTION CONTROL; COMBUSTION WAVES; OSCILLATIONS; COMBUSTION CHAMBERS; HYDROCARBONS; POSITIONING; FLAMES; PULSE COMBUSTION

Citation Formats

Gemmen, R.S., Richards, G.A., Yip, M.T.J., Robey, E., Cully, S.R., and Addis, R.E. Combustor oscillation pressure stabilizer. United States: N. p., 1996. Web.
Gemmen, R.S., Richards, G.A., Yip, M.T.J., Robey, E., Cully, S.R., & Addis, R.E. Combustor oscillation pressure stabilizer. United States.
Gemmen, R.S., Richards, G.A., Yip, M.T.J., Robey, E., Cully, S.R., and Addis, R.E. 1996. "Combustor oscillation pressure stabilizer". United States. doi:. https://www.osti.gov/servlets/purl/595623.
@article{osti_595623,
title = {Combustor oscillation pressure stabilizer},
author = {Gemmen, R.S. and Richards, G.A. and Yip, M.T.J. and Robey, E. and Cully, S.R. and Addis, R.E.},
abstractNote = {In accordance with the objective of the present invention, the active control of unsteady combustion induced oscillations in a combustion chamber fired by a suitable fuel and oxidizer mixture, such as a hydrocarbon fuel and air mixture, is provided by restructuring and moving the position of the main flame front and thereby increasing the transport time and displacing the pressure wave further away from the in-phase relationship with the periodic heat release. The restructuring and repositioning of the main flame are achieved by utilizing a pilot flame which is pulsed at a predetermined frequency corresponding to less than about one-half the frequency of the combustion oscillation frequency with the duration of each pulse being sufficient to produce adequate secondary thermal energy to restructure the main flame and thereby decouple the heat release from the acoustic coupling so as to lead to a reduction in the dynamic pressure amplitude. The pulsating pilot flame produces a relatively small and intermittently existing flame front in the combustion zone that is separate from the oscillating main flame front but which provides the thermal energy necessary to effectively reposition the location of the oscillating main flame front out of the region in the combustion zone where the acoustic coupling can occur with the main flame and thereby effectively altering the oscillation-causing phase relationship with the heat of combustion.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month =
}

Patent Application:

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  • Combustion oscillation control in combustion systems using hydrocarbon fuels is provided by acoustically tuning a fuel-delivery line to a desired phase of the combustion oscillations for providing a pulse of a fuel-rich region at the oscillating flame front at each time when the oscillation produced pressure in the combustion chamber is in a low pressure phase. The additional heat release produced by burning such fuel-rich regions during low combustion chamber pressure effectively attenuates the combustion oscillations to a selected value. 9 figs.
  • Combustion oscillation control in combustion systems using hydrocarbon fuels is provided by acoustically tuning a fuel-delivery line to a desired phase of the combustion oscillations for providing a pulse of a fuel-rich region at the oscillating flame front at each time when the oscillation produced pressure in the combustion chamber is in a low pressure phase. The additional heat release produced by burning such fuel-rich regions during low combustion chamber pressure effectively attenuates the combustion oscillations to a selected value.
  • Combustion oscillation control in combustion systems using hydrocarbon fuels is provided by acoustically tuning a fuel-delivery line to a desired phase of the combustion oscillations for providing a pulse of a fuel-rich region at the oscillating flame front at each time when the oscillation produced pressure in the combustion chamber is in a low pressure phase. The additional heat release produced by burning such fuel-rich regions during low combustion chamber pressure effectively attenuates the combustion oscillations to a selected value.
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