Dilution/effusion hole pattern for thick combustor panels

A combustor assembly comprising:

• an inner annular wall;
• an outer annular wall about the inner annular wall;
• a dome joining the inner annular wall and the outer annular wall,
• wherein each of the inner annular wall and the outer annular wall comprise a hot surface defining a combustion chamber therebetween;
• and
• a dilution hole through the hot surface in fluid communication with a respective cold surface;
• a plurality of film cooling holes, wherein each of the film cooling holes in the plurality of film cooling holes comprise an inlet on the respective cold surface in fluid communication with an outlet on the respective hot surface, wherein the outlet is defined by a major axis and a minor axis, wherein the major axis is longer than the minor axis;
• a first group of the plurality of film cooling holes arranged circumferentially about the dilution hole, the first group of the plurality extending to encircle an upstream side and a downstream side of the dilution hole, wherein the major axis of each of the outlets of the film cooling holes of the first group are oriented radially toward a center of the dilution hole;
• and
• a second group of the plurality of film cooling holes arranged radially, with respect to the center of the dilution hole, outward of the first group and relatively circumferentially between the first group,
• wherein each of the first group of the plurality of film cooling holes and the second group of the plurality of film cooling holes comprise more than one film cooling hole,
• wherein each of the outlets of the film cooling holes of the first group have a first outlet angle, defined in a plane perpendicular to the centerline of the dilution hole, between the major axis of the outlet and a radius extending from the centerline of the dilution hole to the point of intersection of the major axis and the minor axis of the outlet, wherein the first outlet angle is not more than 25° away from the radius extending from the centerline of the dilution hole,
• wherein each of the outlets of the second group of the plurality of film cooling holes are arranged in an arcuate segment extending about the center of the dilution hole and downstream thereof,
• wherein each of the outlets of the film cooling holes of the second group having a second outlet angle, defined in a plane perpendicular to the centerline of the dilution hole, between the major axis of the outlet and a tangent, at the point of intersection of the major axis and the minor axis of the outlet, to the radius extending from the centerline of the dilution hole to the point of intersection of the major axis and the minor axis of the outlet, wherein the second outlet angle is not more than 25° away from the tangent.

A gas turbine engine comprising:

• a compressor section configured to compress a gas;
• a combustor section aft of the compressor section and configured to combust the gas, wherein the combustor section comprises a combustor panel comprising:
• a dilution hole;
• a plurality of film cooling holes, wherein each of the film cooling holes in the plurality of film cooling holes comprise an inlet and an outlet, wherein the outlet is defined by a major axis and a minor axis, wherein the major axis is longer than the minor axis;
• a first group of the plurality of film cooling holes arranged circumferentially about the dilution hole, the first group of the plurality extending to encircle an upstream side and a downstream side of the dilution hole, wherein the major axis of each of the outlets of the film cooling holes of the first group are oriented radially toward a center of the dilution hole;
• and
• a second group of the plurality of film cooling holes arranged radially, with respect to the center of the dilution hole, outward of the first group and relatively circumferentially between the first group,
• wherein each of the first group of the plurality of film cooling holes and the second group of the plurality of film cooling holes comprise more than one film cooling hole
• wherein each of the outlets of the film cooling holes of the first group have a first outlet angle, defined in a plane perpendicular to the centerline of the dilution hole, between the major axis of the outlet and a radius extending from the centerline of the dilution hole to the point of intersection of the major axis and the minor axis of the outlet, wherein the first outlet angle is not more than 25° away from the radius extending from the centerline of the dilution hole,
• wherein each of the outlets of the second group of the plurality of film cooling holes are arranged in an arcuate segment extending about the center of the dilution hole and downstream thereof,
• wherein each of the outlets of the film cooling holes of the second group having a second outlet angle, defined in a plane perpendicular to the centerline of the dilution hole, between the major axis of the outlet and a tangent, at the point of intersection of the major axis and the minor axis of the outlet, to the radius extending from the centerline of the dilution hole to the point of intersection of the major axis and the minor axis of the outlet, wherein the second outlet angle is not more than 25° away from the tangent.