Flow straightener and mixer
AssigneeALSTOM Technology Ltd
InventorsMadhavan Narasimhan Poyyapakkam, Khawar Syed, Satish Kumar Gajula, John Philip Wood
Life of this patent
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Abstract
A combined flow straightener and mixer is disclosed as well as a burner for a combustion chamber of a gas turbine having such a mixing device. At least two streamlined bodies are arranged in a structure comprising the side walls of the mixer. The leading edge area of each streamlined body has a profile, which is oriented parallel to a main flow direction prevailing at the leading edge position, and with reference to a central plane of the streamlined bodies, the trailing edges are provided with at least two lobes in opposite transverse directions. The periodic deflections forming the lobes from two adjacent streamlined bodies are out of phase.
Claims19
Flow straightener and mixing device comprising:
- a structure with walls having a longitudinal axis;
- an inlet area;
- an outlet area in a main flow direction;
- and
- at least two streamlined bodies, which are arranged in the flow straightener and mixing device, each having a streamlined cross-sectional profile, which extends with a longitudinal direction perpendicularly or at an inclination to the main flow direction of the flow straightener and mixing device, wherein a leading edge area of each streamlined body has a profile, which is oriented parallel to the main flow direction at a leading edge position, and wherein, with reference to a central plane of the streamlined bodies, the trailing edges are provided with at least two lobes in opposite transverse directions, wherein a transverse deflection from the central plane of two adjacent streamlined bodies, which form the lobes, are inverted, and wherein a transition from a planar leading edge region to the deflection is smooth with a surface curvature representing a function with a continuous first derivative, and
- at least one of the lobes of the streamlined bodies is configured as an injection device with at least one nozzle for introducing at least one fuel into a burner.
Method for operating a flow straightener and mixing device in combination with a burner for a combination chamber of a gas turbine, the fuel straightener and mixing device having:
- a structure with walls having a longitudinal axis;
- an inlet area;
- an outlet area in a main flow direction;
- at least two streamlined bodies, which are arranged in the flow straightener and mixing device, each having a streamlined cross-sectional profile, which extends with a longitudinal direction perpendicularly or at an inclination to the main flow direction of the flow straightener and mixing device, wherein a leading edge area of each streamlined body has a profile, which is oriented parallel to the main flow direction at a leading edge position, and wherein, with reference to a central plane of the streamlined bodies the trailing edges are provided with at least two lobes in opposite transverse directions, wherein a transverse deflection from the central plane of two adjacent streamlined bodies, which form the lobes, are inverted, and wherein a transition from a planar leading edge region to the deflection is smooth with a surface curvature representing a function with a continuous first derivative, and at least one of the lobes of the streamlined bodies is configured as an injection device with at least one nozzle for introducing at least one fuel into a burner, wherein the method comprises:
- determining a number of fuel injection nozzles through which fuel is injected as function of total injected fuel flow;
- and
- injecting fuel through the fuel injection nozzles.
Dependencies are inferred from the claim text.