Combustor liner and heat shield assembly
AssigneePratt & Whitney Canada Corp.
InventorsBhawan B. Patel, Lorin Markarian, Stephen Phillips, Eduardo Hawie
Life of this patent
Estimating the term…
Abstract
Impingement hole patterns are provided in a combustor dome panel to provide efficient cooling of a combustor dome heat shield. The impingement holes are substantially aligned or located above partial height protuberances provided on the back face of the heat shield.
Claims29
A combustor and dome heat shield assembly comprising a plurality of heat shield sectors mounted adjacent and spaced apart a distance from an annular dome of the combustor, each heat shield sector having a heat shield body defined between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face having a first plurality of protuberances extending from the back face to a first height, the first height being substantially equal to said distance, the back face having a second plurality of protuberances extending from the back face to a second height, the second height being less than the first height, the combustor having a plurality of impingement cooling holes defined through the dome, the impingement cooling holes substantially aligned with the second plurality of protuberances, wherein a ratio of a diameter of the impingement cooling holes to a height between the impingement cooling holes and tops of the second plurality of protuberances is greater than one and less than five.
A combustor dome comprising at least one heat shield mounted to an annular dome panel, the at least one heat shield and the dome panel defining an air space therebetween and at least one fuel nozzle opening for receiving a fuel nozzle, a plurality of impingement holes defined in said dome panel for causing an impingement fluid to impinge upon a back face of the at least one heat shield, the back face having a heat exchange promoting protuberance pattern thereon, said pattern being divided in regions by ribs projecting outwardly from said back face, said ribs including a first rib extending around said fuel nozzle opening and circumscribing a central annular area and a second rib extending from opposed sides of the first rib towards lateral edges of the at least one heat shield, the heat exchange promoting protuberance pattern including first and second set of protuberances, the protuberances of the second set being shorter than the protuberances of the first set and located at least partly outwardly of the central annular area adjacent to the first rib and adjacent to the second rib on either sides thereof, wherein the impingement holes are substantially aligned with the second set of protuberances, and wherein a ratio of a diameter of the impingement holes to a height between the impingement holes and tops of the second set of protuberances is greater than one and less than five.
A combustor and dome heat shield assembly comprising a plurality of heat shield sectors mounted adjacent and spaced apart a distance from an annular dome of the combustor, each heat shield sector having a heat shield body defined between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face having a first plurality of protuberances extending from the back face to a first height, the first height being substantially equal to said distance, the back face having a second plurality of protuberances extending from the back face to a second height, the second height being less than the first height, the combustor having a plurality of impingement cooling holes defined through the dome, the impingement cooling holes substantially aligned with the second plurality of protuberances, wherein the protuberances are frustoconical.
A combustor and dome heat shield assembly comprising a plurality of heat shield sectors mounted adjacent and spaced apart a distance from an annular dome of the combustor, each heat shield sector having a heat shield body defined between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face having a first plurality of protuberances extending from the back face to a first height, the first height being substantially equal to said distance, the back face, having a second plurality of protuberances extending from the back face to a second height, the second height being less than the first height, the combustor having a plurality of impingement cooling holes defined through the dome, the impingement cooling holes substantially aligned with the second plurality of protuberances, wherein said first plurality of protuberances are provided in at least one central region and in radially peripheral regions, and wherein concentration density of said first plurality of protuberances in said at least one central region is higher than in said radially peripheral regions.
A combustor and dome heat shield assembly comprising a plurality of heat shield sectors mounted adjacent and spaced apart a distance from an annular dome of the combustor, each heat shield sector having a heat shield body defined between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face having a first plurality of protuberances extending from the back face to a first height, the first height being substantially equal to said distance, the back face having a second plurality of protuberances extending from the back face to a second height, the second height being less than the first height, the combustor having a plurality of impingement cooling holes defined through the dome, the impingement cooling holes substantially aligned with the second plurality of protuberances, wherein ridges extend along the back face of the heat shield body, said ridges cooperating to direct a flow of cooling air to said radially outer and inner edges where the cooling air is discharged from the back face of the heat shield body, and wherein and array of straightener ribs is provided along at least one of said radially inner and radially outer edges.
A combustor and dome heat shield assembly comprising a plurality of heat shield sectors mounted adjacent and spaced apart a distance from an annular dome of the combustor, each heat shield sector having a heat shield body defined between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face having a first plurality of protuberances extending from the back face to a first height, the first height being substantially equal to said distance, the back face having a second plurality of protuberances extending from the back face to a second height, the second height being less than the first height, the combustor having a plurality of impingement cooling holes defined through the dome, the impingement cooling holes substantially aligned with the second plurality of protuberances, wherein a central circular ridge extends around the at least one fuel nozzle opening on the back face of the heat shield body, said central circular ridge circumscribing a central area, and wherein a plurality of cooling holes are defined through the heat shield body in said central area, further comprising diametrically opposed ridges running from said central circular ridge towards said opposed lateral edges, a first pair of ridges running from the central circular ridge towards the radially outer edge in a direction generally perpendicular thereto, and a second pair of ridges running from the central circular ridge towards the radially inner edge in a direction generally perpendicular thereto.
A combustor and dome heat shield assembly comprising a plurality of heat shield sectors mounted adjacent and spaced apart a distance from an annular dome of the combustor, each heat shield sector having a heat shield body defined between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face having a first plurality of protuberances extending from the back face to a first height, the first height being substantially equal to said distance, the back face having a second plurality of protuberances extending from the back face to a second height, the second height being less than the first height, the combustor having a plurality of impingement cooling holes defined through the dome, the impingement cooling holes substantially aligned with the second plurality of protuberances, wherein a central circular ridge extends around the at least one fuel nozzle opening on the back face of the heat shield body, said central circular ridge circumscribing a central area, and wherein a plurality of cooling holes are defined through the heat shield body in said central area, further comprising diametrically opposed ridges running from said central circular ridge towards said opposed lateral edges, and wherein the heat exchange promoting structures are arranged in rows substantially parallel to said diametrically opposed ridges.
Dependencies are inferred from the claim text.