SWIRLER, COMBUSTION CHAMBER UNIT AND GAS TURBINE WITH IMPROVED FUEL/AIR MIXING Russian patent published in 2020 - IPC F23R3/14 

FIELD: turbines.

SUBSTANCE: swirler (1) for creation of fuel/air mixture has central axis (9) and comprises annular array of blades (7), annular closing plate (92) and multiple mixing channels (75). Circular mass of blades (7) is arranged on support plate (71) and passes around central axis (9). Circular closing plate (92) is located above the annular array of blades. Plurality of mixing channels (75) is formed by circular array of blades (7), support plate (71) and annular closing plate (92) for mixing fuel and air (6). At least one mixing channel (75) from plurality of mixing channels (75) is defined by opposite walls (73) of two adjacent blades (7) from plurality of blades (7). At least one of opposite walls (7) includes at least one primary side injection hole (60) configured to eject fuel flow (66) into mixing channel (75), and at least one secondary lateral injection hole (80) corresponding to the primary lateral injection hole (60) and configured to eject fuel jet (88) into mixing channel (75). Secondary side hole (80) for injection is located on wall (73) of blade (7) so that jet (88) ejected from secondary lateral hole (80) for injection, creates turbulence (8) in mixing channel (75) in flow (66) ejected from primary side hole (60) for injection. Distance (101) of secondary side hole (80) for injection from primary side hole (60) for injection is from 10 % to 20 % or from 5 % to 10 % of length (107) of wall (73), measured along wall (73) in radial direction from inner thin end (74) of blade (7) to radial direction of outer wide end (72) of blade (7).

EFFECT: invention is aimed at improving fuel and air mixing in the swirling area by providing a homogeneous fuel/air mixture at all possible loads of the gas turbine.

13 cl, 9 dwg