Heat shield for a gas turbine combustion chamber
AssigneeBMW Rolls-Royce GmbH
InventorAchim Schmid
Life of this patent
Estimating the term…
Abstract
A heat shield for the head area of a combustion chamber has as usual a through-hole for the burner. A continuous collar with air passage holes projects from the back side of the heat shield at the edge of the through-hole. Cooling air can flow through the holes into a ring-shaped channel arranged between the heat shield and the burner, then into the combustion chamber. This cool air flow lies as a cool air film on the surface of the heat shield. For that purpose, the cool air flow or cool air film swirls in the same direction as the combustion air supplied through the burner. To generate this swirling motion, the air passage holes in the collar are inclined in the radial direction. The heat shield is further provided with appropriate inclined effusion holes.
Claims12
A heat shield for a combustion chamber having a through-hole for a burner, wherein a ring-shaped channel is formed between the heat shield and the burner, and further wherein a rearward side of the heat shield facing away from the combustion chamber is acted upon by cooling air and has a web extending around on an edge of the through-hole, wherein said web includes a plurality of air passage holes inclined at an angle (.alpha.) with respect to a direction pointing into a center of the through-hole such that an air flow entering through the air passage holes into the ring-shaped channel arranged between the heat shield and the burner and arriving from said channel into the combustion chamber forms a swirl having a swirl direction which is the same as a further swirl formed by combustion air supplied via the burner, said further swirl having a swirl axis arranged perpendicular to a forward surface of the heat shield.
A heat shield for a combustion chamber having a through-hole for a burner, wherein a ring-shaped channel is formed between the heat shield and the burner and further wherein a rearward side of the heat shield facing away from the combustion chamber is acted upon by cooling air and has a web extending around on an edge of the through-hole, the heat shield further comprising a swirler arranged at an upstream end of said web, such that an air flow entering through the swirler into the ring-shaped channel and arriving from said channel into the combustion chamber forms a swirl having a swirl direction which is the same as a further swirl formed by combustion air supplied via the burner, said further swirl having a swirl axis arranged perpendicular to a forward surface of the heat shield.
Dependencies are inferred from the claim text.