Patent ID: 8763399

Claim:
A combustor comprising: a plurality of fueling nozzles that jet a fuel; and a blowhole plate having blowholes, wherein each blowhole is configured to supply a mixture of air and the fuel jetted from each of the fueling nozzles to a combustion chamber; wherein a plurality of said blowholes are arranged in a plurality of circular arrays, wherein said circular arrays are concentric to one another and form a plurality of groups; a center group of said plurality of groups is located at a center of the blowhole plate, surrounding groups of said plurality of groups, are arranged to form a circular array around said center group, the blowholes of said center group are provided with a swirling angle to form a first swirling flow that rotates around each circular array of said center group, wherein the first swirling flow rotates along a first direction, the blowholes of said surrounding groups are provided with a swirling angle to form a second swirling flow along a second direction, wherein said first and second directions are opposite to one another, each group of said surrounding groups comprises an outermost circular array of blowholes, and said outermost circular array of blowholes includes a region that is substantially and continuously devoid of blowholes, such that a plan view of the blowhole plate depicts said outermost circular array of blowholes being substantially c-shaped.