US 11,655,730 B2
Strut structure of gas turbine, an exhaust diffuser and gas turbine including the same
Ik Sang Lee, Suwon-si (KR); Willy Hofmann, Uri (KR); and Young Chan Yang, Changwon-si (KR)
Assigned to DOOSAN ENERBILITY CO., LTD., Changwon (KR)
Filed by DOOSAN ENERBILITY CO., LTD., Changwon-si (KR)
Filed on Jan. 20, 2020, as Appl. No. 16/746,962.
Claims priority of application No. 10-2019-0034660 (KR), filed on Mar. 26, 2019.
Prior Publication US 2020/0308981 A1, Oct. 1, 2020
Int. Cl. F01D 25/16 (2006.01); F01D 9/04 (2006.01); F01D 25/30 (2006.01); F01D 25/24 (2006.01)
CPC F01D 25/162 (2013.01) [F01D 9/041 (2013.01); F01D 25/30 (2013.01); F01D 25/24 (2013.01); F05D 2240/12 (2013.01); F05D 2240/14 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A strut structure of a gas turbine, the strut structure being formed in an annular exhaust passage for an exhaust gas to flow, formed between an inner casing and an outer casing of the gas turbine, the strut structure comprising:
a strut housing configured to include a lower end which is connected to the inner casing and an upper end which is connected to an outer casing; and
a strut groove configured to be formed on at least one end of the upper end and the lower end of the strut housing to connect a front end and a rear end thereof,
wherein a lower inner fillet is formed on an upper surface of the inner casing, and an upper inner fillet is formed on a lower surface of the outer casing,
wherein the lower inner fillet and the upper inner fillet are partially inserted into the strut housing, and a portion not inserted into the strut housing forms the strut groove, sizes of an outer circumferential surfaces of the lower inner fillet and the upper inner fillet are smaller than a size of an outer circumferential surface of the strut housing, portions of the upper and lower inner fillets not inserted into the strut housing and the upper and lower end portions of the strut housing form a step, and the step forms the strut groove which connects the front end and the rear end of the strut housing and reduces a pressure loss rate of the strut structure,
wherein the strut groove is configured to generate a vortex of the exhaust gas, creating a turbulence effect, and
wherein the strut groove further comprises a groove pattern which is a channel that extends into one of the lower and upper inner fillets, the groove pattern being configured to add further turbulence effect in addition to said turbulence effect.