초록 ▼

High dynamic pressure oscillations in hydrocarbon-fueled combustors typically occur when the transport time of the fuel to the flame front is at some fraction of the acoustic period. These oscillations are reduced to acceptably lower levels by restructuring or repositioning the flame front in the co

High dynamic pressure oscillations in hydrocarbon-fueled combustors typically occur when the transport time of the fuel to the flame front is at some fraction of the acoustic period. These oscillations are reduced to acceptably lower levels by restructuring or repositioning the flame front in the combustor to increase the transport time. A pilot flame front located upstream of the oscillating flame and pulsed at a selected frequency and duration effectively restructures and repositions the oscillating flame in the combustor to alter the oscillation-causing transport time.

대표청구항 ▼

[ What is claimed is:] [1.] Improved apparatus for the active control of unstable oscillation-producing combustion in a combustion system comprising a combustion chamber having a combustion zone with opposite end regions and means for introducing a first mixture of a fuel and oxidizer into the combu

[ What is claimed is:] [1.] Improved apparatus for the active control of unstable oscillation-producing combustion in a combustion system comprising a combustion chamber having a combustion zone with opposite end regions and means for introducing a first mixture of a fuel and oxidizer into the combustion zone at one end region thereof for the combustion of the fuel and oxidizer mixture, wherein the combustion of the fuel and oxidizer mixture forms an oscillating flame within the combustion zone at a location intermediate said end regions to effect the formation of dynamic pressure oscillations within the combustion chamber with the amplitude of said oscillations being dependent upon the degree of an in-phase relationship of the pressure wave produced by each oscillation with the periodic heat release produced by the combustion of the fuel in said fuel and oxidizer mixture, the improved apparatus defined by combustion oscillating pressure stabilizing means for reducing the amplitude of the pressure oscillations within the combustion chamber and comprising, chamber means communicating with said combustion chamber at said one end region thereof, fuel supplying means and oxidizer supplying means coupled to one of said chamber means and said combustion chamber for introducing thereinto at least one flowing stream of fuel and oxidizer for forming a second mixture thereof for producing a pilot flame within said combustion zone at said one end region thereof, and flow control means for intermittently interrupting the flow of at least one of the fuel from the fuel supplying means and the oxidizer from the oxidizer supplying means into the chamber means at a selected frequency and duration for intermittently and sequentially interrupting and establishing the flow of said at least one of the fuel from the fuel supplying means and the oxidizer from the oxidizer supplying means into said one of the chamber means and the combustion chamber for forming discrete mixtures of fuel and oxidizer from said second mixture which sequentially produce a pulsing pilot flame within said combustion zone for contact with the oscillating flame in the combustion zone, said control means providing a frequency and duration of interrupting and establishing the flow of said at least one of the fuel and the oxidizer adequate to provide the pulsing pilot flame with sufficient thermal energy within said combustion zone to effect the restructuring of the oscillating flame and thereby sufficiently repositioning the oscillating flame in the combustion zone to change the phase relationship of each pressure wave with the each periodic heat release away from an in-phase relationship therebetween for reducing the amplitude of the pressure oscillations.