Gas turbine device

Abstract

A gas turbine device in which the low frequency vibrations or the low frequency noises during the low load operation can be effectively suppressed with no increase of the pressure loss of the exhaust gas being triggered includes a gas turbine engine provided with an exhaust diffuser forming an upstream portion of an exhaust gas passage, an exhaust strut provided in the diffuser ( 20 ), and a swirling flow blocking plate. The swirling flow blocking plate is disposed on a downstream side of the exhaust strut in the exhaust gas passage so as to extend in an axial direction.

What is claimed is: 
     
         1 . A gas turbine device comprising:
 a gas turbine engine provided with an exhaust diffuser forming an upstream portion of an exhaust gas passage;   an exhaust strut provided in the exhaust diffuser; and   a swirling flow blocking plate disposed on a downstream side of the exhaust strut in the exhaust gas passage and extending in an axial direction.   
     
     
         2 . The gas turbine device as claimed in  claim 1 , wherein a plurality of the exhaust struts spaced from each other in a circumferential direction are employed, and the swirling flow blocking plate is disposed at a position circumferentially intermediate between the neighboring exhaust struts. 
     
     
         3 . The gas turbine device as claimed in  claim 1 , wherein the swirling flow blocking plate has an axial length that is greater than an axial length of the exhaust strut. 
     
     
         4 . The gas turbine device as claimed in  claim 3 , wherein the axial length of the swirling flow blocking plate is within the range of 2 to 4 times the axial length of the exhaust strut. 
     
     
         5 . The gas turbine device as claimed in  claim 1 , wherein the four to six exhaust struts, which are spaced from each other in the circumferential direction, are employed. 
     
     
         6 . The gas turbine device as claimed in  claim 1 , wherein the exhaust diffuser includes an inner casing and an outer casing disposed coaxially with each other, and the inner casing and the outer casing are connected with each other through the exhaust struts. 
     
     
         7 . The gas turbine device as claimed in  claim 1 , further comprising:
 an exhaust duct fluidly connected on a downstream side of the exhaust diffuser,   wherein the exhaust duct includes an inner tube and an outer tube disposed coaxially with each other; and   wherein the swirling flow blocking plate is so fixed to the inner tube that a gap is defined between the outer tube and the swirling flow blocking plate at least under a cold state.   
     
     
         8 . The gas turbine device as claimed in  claim 7 , wherein the swirling flow blocking plate includes a set of two plate members overlapped with each other and is fixed to the inner tube with respective mounting portions at inner diametric ends of the plate members being curved in respective directions opposite to each other.