Heat-transfer device and gas turbine combustor with same
Disclosed is a heat-transfer device adapted to enhance uniformity of cooling characteristics to be given to a heat transfer object, and thereby to extend a life of the heat transfer object. The heat-transfer device for facilitating heat exchange between combustion air (heat transfer medium) flowing along an outer surface of a combustor liner (heat transfer object), and the combustor liner, the heat-transfer device including at least one longitudinal vortex generating device protruding toward a annular passage (flow passage) of the combustion air and formed to generate a longitudinal vortex E with a central axis in a flow direction of the combustion air, and stir the combustion air flowing in the annular passage; and at least one radiator fin provided in a region A on the outer surface of the combustor liner, the region A being where a flow of the vortex E, on a swirling plane thereof, that are generated by the vortex generating device is directed from a side of the combustor liner, toward a side of a flow sleeve, the fin exchanging heat with the combustion air stirred by the vortex generating device.
1. A heat-transfer device for facilitating heat exchange between a heat transfer object and a heat transfer medium flowing along a surface of the heat transfer object, the heat-transfer device comprising:
at least one longitudinal vortex generating device protruding from a surface side of the heat transfer object toward a flow passage of the heat transfer medium, the at least one longitudinal vortex generating device being configured to generate a longitudinal vortex with a central axis in a flow direction of the heat transfer medium to stir the heat transfer medium flowing in the flow passage; and
at least one radiator fin provided on the surface of the heat transfer object only in a region A out of two regions A and B which differ in flow direction on a swirling plane of the longitudinal vortex by the at least one longitudinal vortex generating device, no radiator fins being placed in the region B, the region A being a region where a flow of the longitudinal vortex, on the swirling plane is directed away from a heat transfer object side, the region B being a region where a flow of the longitudinal vortex on the swirling plane is directed toward the heat transfer object side, an entirety of the at least one radiator fin being disposed only in an area downstream from the at least one longitudinal vortex generating device in the flow direction of the heat transfer medium, the at least one radiator fin being configured to exchange heat with the heat transfer medium stirred by the at least one longitudinal vortex generating device.
2. The heat-transfer device according to claim 1 , wherein:
the at least one longitudinal vortex generating device is a convex portion; and
the at least one radiator fin is a plate-shaped member disposed in a standing condition on the surface of the heat transfer object, the at least one radiator fin extending in the flow direction of the heat transfer medium.
3. The heat-transfer device according to claim 2 , wherein:
the at least one longitudinal vortex generating device is inclined in a direction parallel to the surface of the heat transfer object, at an angle of a predetermined range with respect to the flow direction of the heat transfer medium.
4. The heat-transfer device according to claim 2 , wherein:
the at least one longitudinal vortex generating device and the at least one radiator fin respectively comprise a plurality of longitudinal vortex generating devices and a plurality of radiator fins, the plurality of longitudinal vortex generating devices and the plurality of radiator fins are respectively arranged in a direction perpendicular to the flow direction of the heat transfer medium.
5. The heat-transfer device according to claim 4 , wherein:
longitudinal vortex generating devices adjacent to each other among the plurality of longitudinal vortex generating devices are formed to generate longitudinal vortices whose swirling directions are opposite to each other.
6. The heat-transfer device according to claim 5 , wherein:
geometry and layout of the plurality of longitudinal vortex generating devices and arrangement of the plurality of radiator fins are such that the following is satisfied:
0.5≤ R/P≤ 3.8;
1.1≤ R/H≤ 5.0; and
0.5≤ F/R≤ 3.6,
wherein R, P, H, and F respectively denote a gap of the flow passage in a direction perpendicular to the heat transfer object, a pitch of the longitudinal vortex generating devices, height of the longitudinal vortex generating devices, and an interval between the radiator fins.
7. The heat-transfer device according to claim 2 , wherein:
the at least one radiator fin extends along an overall length of a section of the heat transfer object that needs cooling in the flow direction of the heat transfer medium.
8. The heat-transfer device according to claim 1 , further comprising:
at least one turbulent-flow enhancer provided on the surface of the heat transfer object, the at least one turbulent-flow enhancer being configured to destroy a boundary layer of the heat transfer medium stirred by the at least one longitudinal vortex generating device, the boundary layer generated on the surface of the heat transfer object.
9. The heat-transfer device according to claim 1 , wherein:
the at least one longitudinal vortex generating device and the at least one radiator fin respectively comprise a plurality of longitudinal vortex generating devices and a plurality of radiator fins, the plurality of longitudinal vortex generating devices are arranged in the flow direction of the heat transfer medium, and the plurality of radiator fins are arranged in the flow direction of the heat transfer medium.
10. A gas turbine combustor comprising:
a combustor liner having an outer circumferential surface; and
the heat-transfer device according to claim 1 , placed on the outer circumferential surface of the combustor liner as the heat transfer object.
11. A heat-transfer device for facilitating heat exchange between a heat transfer object and a heat transfer medium flowing along a surface of the heat transfer object, the heat-transfer device comprising:
at least one longitudinal vortex generating device protruding toward a flow passage of the heat transfer medium, the at least one longitudinal vortex generating device being configured to generate a longitudinal vortex with a central axis in a flow direction of the heat transfer medium to stir the heat transfer medium flowing in the flow passage; and
at least one radiator fin provided on the surface of the heat transfer object only in a region A out of two regions A and B which differ in flow direction on a swirling plane of the longitudinal vortex by the at least one longitudinal vortex generating device, the region A being a region where a flow of the longitudinal vortex on the swirling plane is directed away from a heat transfer object side, the region B being a region where a flow of the longitudinal vortex on the swirling plane is directed toward the heat transfer object side, the at least one radiator fin being configured to exchange heat with the heat transfer medium stirred by the at least one longitudinal vortex generating device, wherein:
the at least one longitudinal vortex generating device is a convex portion protruding from a surface side of the heat transfer object toward the flow passage;
the at least one radiator fin is a plate-shaped member disposed in a standing condition on the surface of the heat transfer object, downstream of the at least one longitudinal vortex generating device in the flow direction of the heat transfer medium, the at least one radiator fin extending in the flow direction of the heat transfer medium; and
the at least one radiator fin is formed so that a cross-section of the radiator fin is gradually thinner from a base toward a tip and so that an outer profile of the cross-section has a concave shape obtained by curvilinearly forming a geometrical shape of a portion of an ellipsis.