The present invention relates to a premix burner of a combustion chamber of a gas turbine with at least one annular duct for supplying air and fuel, including a radially outer and a radially inner combustion chamber wall relative to a burner central axis and with at least one swirler arranged in the
The present invention relates to a premix burner of a combustion chamber of a gas turbine with at least one annular duct for supplying air and fuel, including a radially outer and a radially inner combustion chamber wall relative to a burner central axis and with at least one swirler arranged in the duct, said swirler including several flow-guiding elements distributed around the circumference of the duct cross-section, characterized in that at least one radially inner duct wall is provided in the area of the flow-guiding elements with a concave recess of the annular groove type.
대표청구항▼
1. A premix burner of a combustion chamber of a gas turbine, comprising: at least one annular duct for supplying air and fuel;a radially outer and a radially inner combustion chamber wall relative to a burner central axis;at least one swirler arranged in the duct, said swirler including a plurality
1. A premix burner of a combustion chamber of a gas turbine, comprising: at least one annular duct for supplying air and fuel;a radially outer and a radially inner combustion chamber wall relative to a burner central axis;at least one swirler arranged in the duct, said swirler including a plurality of flow-guiding elements distributed around a circumference of the duct cross-section;at least one radially inner duct wall provided in an area of the flow-guiding elements;an inner concave recess positioned in the radially inner duct wall and shaped as an annular groove, a concavity of the inner concave recess positioned toward the flow-guiding elements, each flow-guiding element having flow profile that is provided between an inflow-side leading edge and an outflow-side trailing edge, with the inflow-side leading edge and the outflow side trailing edge each being arranged on a cross-sectional plane perpendicular to the burner central axis, a depth of the concavity of the inner concave recess being greater at a first position intermediate the plane of the leading edge to the plane of the trailing edge than at both of the plane of the leading edge and the plane of the trailing edge. 2. The premix burner in accordance with claim 1, and further comprising: a radially outer duct wall provided in the area of the flow-guiding elements;an outer concave recess positioned in the radially outer duct wall and shaped as an annular groove, a concavity of the outer concave recess positioned toward the flow-guiding elements, a depth of the concavity of the outer concave recess being greater at a second position intermediate the plane of the leading edge to the plane of the trailing edge than at both of the plane of the leading edge and the plane of the trailing edge. 3. The premix burner in accordance with claim 2, wherein a cross-sectional area of at least one chosen from the inner concave recess and the outer concave recess is equal to or less than a total of thicknesses of the flow-guiding elements established in a respective cross-sectional plane perpendicular to the burner axis. 4. The premix burner in accordance with claim 3, wherein at least one chosen from the inner concave recess and the outer concave recess is provided in an axial direction from the plane of the leading edge to the plane of the trailing edge. 5. The premix burner in accordance with claim 2, wherein at least one chosen from the inner concave recess and the outer concave recess is provided in an axial direction from the plane of the leading edge to the plane of the trailing edge. 6. The premix burner in accordance with claim 2, wherein at least one chosen from the inner concave recess and the outer concave recess begins at the plane of the leading edge and extends to and ends at the plane of the trailing edge. 7. The premix burner in accordance with claim 3, wherein at least one chosen from the inner concave recess and the outer concave recess begins at the plane of the leading edge and extends to and ends at the plane of the trailing edge. 8. The premix burner in accordance with claim 2, wherein a shape of the annular duct is defined by at least one chosen from two equations as follows: Ri=0,5·N·dπ+(0,5·N·dπ)2-(((R0i+R0a2)2-R0i2)-(R0i-R0a2)2+R0i+R0a2·N·dπ)andRa=0,5·N·dπ+(0,5·N·dπ)2+((R0a2-(R0i+R0a2)2)+(R0i+R0a2)2-R0i+R0a2·N·dπ) where: Ri is a radial coordinate of the inner duct wall along a chord length of the flow-guiding element;Ra is a radial coordinate of the outer duct wall along the chord length;a factor N, which is any number between 1 and a number of flow-guiding elements;a position x, which describes a position along a profile chord of the flow-guiding element and is defined as being between 0 at the leading edge and 1 at the trailing edge;a thickness d derived from a thickness distribution at the position x, where: d=4·(xx2)ROi is a radial coordinate position of the inner duct wall at the leading edge;ROa is a radial coordinate position of the outer duct wall at the leading edge. 9. The premix burner in accordance with claim 1, and further comprising a radially outer duct wall provided in the area of the flow-guiding elements, wherein a shape of the annular duct is defined by at least one chosen from two equations as follows: Ri=0,5·N·dπ+(0,5·N·dπ)2-(((R0i+R0a2)2-R0i2)-(R0i-R0a2)2+R0i+R0a2·N·dπ)andRa=0,5·N·dπ+(0,5·N·dπ)2+((R0a2-(R0i+R0a2)2)+(R0i+R0a2)2-R0i+R0a2·N·dπ) where: Ri is a radial coordinate of the inner duct wall along a chord length of the flow-guiding element;Ra is a radial coordinate of the outer duct wall along the chord length;a factor N, which is any number between 1 and a number of flow-guiding elements;a position x, which describes a position along a profile chord of the flow-guiding element and is defined as being between 0 at the leading edge and 1 at the trailing edge;a thickness d derived from a thickness distribution at the position x, where: d=4·(xx2)ROi is a radial coordinate position of the inner duct wall at the leading edge;ROa is a radial coordinate position of the outer duct wall at the leading edge.
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이 특허에 인용된 특허 (4)
Hiromitsu, Nagayoshi; Hosoi, Jun; Fujii, Atsushi; Saitou, Tsukasa; Riechelmann, Dirk; Sato, Junichi, Burner for combustion chamber and combustion method.
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