COMBUSTOR

A combustor (200, 300, 400, 50, 600, 700, 800, 900, 1000, 1100, 1200) that includes a combustion chamber (202, 1002) having an outer liner (204, 1004) and an inner liner (206, 1006) and defining a first combustion zone (202a, 1002a), an annular dome (210, 1010, 1110) coupled to the outer liner (204, 1004) and the inner liner (206, 1006), and a trapped vortex cavity (230, 330, 430, 530, 630, 730, 830, 930, 1030, 1230) extending from at least one of the outer liner (204, 1004) or the inner liner (206, 1006) and defining a second combustion zone (202b, 302b, 402b, 502b, 602b, 702b, 802b, 902b, 1002b, 1202b). A plurality of first mixing assemblies (212, 912, 1012, 1112) are disposed through the annular dome (210, 1010, 1110), and operably inject a first fuel-air mixture into the first combustion zone (202a, 1002a). A plurality of second mixing assemblies (220, 420, 620, 820, 920, 1020) are disposed through the outer liner (204, 1004) or the inner liner (206, 1006) at the trapped vortex cavity (230, 330, 430, 530, 630, 730, 830, 930, 1030, 1230), and operably inject a second fuel-air mixture into the second combustion zone (202b, 302b, 402b, 502b, 602b, 702b, 802b, 902b, 1002b, 1202b) to produce combustion gases (66). A steam system (90) includes a steam injector (244, 344, 544, 744, 944, 1044, 1144, 1244) in fluid communication with the trapped vortex cavity (230, 330, 430, 530, 630, 730, 830, 930, 1030, 1230). The steam injector (244, 344, 544, 744, 944, 1044, 1144, 1244) operably injects steam (69) into the trapped vortex cavity (230, 330, 430, 530, 630, 730, 830, 930, 1030, 1230) and the steam (69) mixes with the combustion gases (66).