Inward fired radial gas burner assembly and cooktop appliance

A cooktop appliance, comprising:

• a cabinet configured to receive an inward fired burner assembly, the inward fired burner assembly comprising an annular burner body forming a plurality of flame ports distributed in adjacent arrangement along a circumferential direction and extending radially inward from a mixing chamber formed at the annular burner body and substantially surrounding a central combustion zone, the plurality of flame ports forming a swirl angle extending between an inlet opening proximate to the mixing chamber and an outlet opening distal to the mixing chamber and adjacent to the central combustion zone, wherein the plurality of flame ports extend at an angle greater than zero degrees and less than 90 degrees, wherein the annular burner body comprises an inner side wall at which the outlet opening of the plurality of flame ports is formed, and wherein a recess is formed at the inner side wall between a circumferentially adjacent pair of flame ports, wherein the inlet opening is positioned radially outward of the outlet opening relative to a center point at the central combustion zone, and wherein an angle of an inner wall of the flame ports extending between the inlet opening and the outlet opening is between approximately 80 degrees and approximately 100 degrees relative to a first wall of the recess extending from a leading edge of the outlet opening toward a nadir of the recess.