초록 ▼

An impingement cooled wall arrangement includes a flow diverter arranged in the cooling flow path between the cooled wall and a sleeve to divert a cross flow away from a second aperture. The flow diverter extends in downstream direction of the cross flow beyond the second aperture with a first leg e

An impingement cooled wall arrangement includes a flow diverter arranged in the cooling flow path between the cooled wall and a sleeve to divert a cross flow away from a second aperture. The flow diverter extends in downstream direction of the cross flow beyond the second aperture with a first leg extending along one side of the second aperture in downstream direction of the cross flow and a second leg extending along the other side of the second aperture. No impingement cooling aperture is arranged in a first convective cooling section of the wall between the upstream end and downstream end of the flow diverter outside the section shielded by the diverter.

대표청구항 ▼

1. An impingement cooled wall arrangement comprising: an impingement sleeve and a wall exposed to a hot gas during operation, wherein the impingement sleeve is at least partly disposed in a plenum, and spaced at a distance from the wall to form a cooling flow path between the wall and the impingemen

1. An impingement cooled wall arrangement comprising: an impingement sleeve and a wall exposed to a hot gas during operation, wherein the impingement sleeve is at least partly disposed in a plenum, and spaced at a distance from the wall to form a cooling flow path between the wall and the impingement sleeve such that compressed gas injected from the plenum through a first aperture in the impingement sleeve during operation will impinge on the wall and flow as a cross flow towards an exit at a downstream end of the cooling flow path;a flow diverter is arranged in the cooling flow path downstream of the first aperture to divert the cross flow away from a second aperture, wherein the flow diverter comprises a first leg extending along one side of the second aperture in a downstream direction of the cross flow and a second leg extending along another side of the second aperture in the downstream direction of the cross flow and wherein no impingement cooling aperture is arranged in a first convective cooling section of the wall which is a wall section between an upstream end and a downstream end of the flow diverter outside a section shielded by the flow diverter, wherein the second aperture is configured to inject the compressed gas into a section between the first leg and the second leg of the flow diverter, and the flow diverter extends from a location between the first aperture and the second aperture in the downstream direction of the cross flow beyond the second aperture, and a cross section for the cross flow is reduced at a location of the second aperture in the direction of the cross flow relative to the cross section of the cooling flow path upstream of the flow diverter, and wherein the flow diverter extends from the impingement sleeve and connecting to an outer surface of the wall. 2. The impingement cooled wall arrangement according to claim 1, wherein the cross section for the cross flow around the diverter increases towards the downstream end of the flow diverter relative to the flow cross section for the cross flow at the location of the second aperture relative to the cross section of the cooling flow path upstream of the flow diverter. 3. The impingement cooled wall arrangement according to claim 1, wherein the first leg and the second leg of the flow diverter turn towards each other at the downstream end of the flow diverter thereby increasing the cross section for the cross flow outside the flow diverter. 4. The impingement cooled wall arrangement according to claim 1, wherein a height of the cooling flow path is reduced in a region of the flow diverter relative to the height of the cooing flow path upstream of the flow diverter to accelerate a flow velocity of the cross flow. 5. The impingement cooled wall arrangement according to claim 1, wherein a height of the cooling flow path is increased downstream of the flow diverter relative to a height of the cooling flow path in the region of the flow diverter to decelerate a flow velocity of the cross flow. 6. The impingement cooled wall arrangement according to claim 1, wherein an additional injection hole for injecting the compressed gas into the cross flow is arranged in the impingement sleeve in a downstream region of the flow diverter, and wherein the downstream region of the flow diverter extends in the flow direction of the cross flow from a position of the second aperture to a position two times a cooling flow path height downstream of the flow diverter. 7. The impingement cooled wall arrangement according to claim 1, wherein a turbulator is arranged on the wall in the first convective section and/or in a second convective section downstream of the flow diverter for heat transfer enhancement. 8. The impingement cooled wall arrangement according to claim 1, wherein a downstream end of the first leg and/or the second leg of the flow diverter has a porous section or has at least one balancing hole to allow a gas flow through the downstream end of the first leg and/or the second leg. 9. A combustor and/or gas turbine comprising: an impingement cooled wall arrangement according to claim 1. 10. The impingement cooled wall arrangement according to claim 1, wherein the second aperture comprises a plurality of second apertures, wherein the flow diverter shields the plurality of second apertures. 11. The impingement cooled wall arrangement according to claim 1, wherein the flow diverter is U-shaped with the first leg and the second leg extending in the flow direction of the cross flow around the second aperture. 12. The impingement cooled wall arrangement according to claim 1, wherein the first aperture comprises at least two rows of first apertures, each of the at least two rows of first apertures comprising at least two first apertures. 13. The impingement cooled wall arrangement according to claim 12, wherein the second aperture comprises at least two second apertures. 14. The impingement cooled wall arrangement according to claim 1, wherein a downstream end of the first leg and/or the second leg of the flow diverter has at least one balancing hole to allow a gas flow through the downstream end of the first leg and/or the second leg of the flow diverter. 15. A method for impingement cooling a wall exposed to a hot gas during operation, wherein an impingement sleeve is at least partly disposed in a plenum, and spaced at a distance from the wall to form a cooling flow path between the wall and the impingement sleeve comprising: injecting compressed gas from the plenum through a first aperture in the impingement sleeve, during operation, into the cooling flow path, impinging the compressed gas on the wall, and directing the compressed gas as a cross flow towards an exit at a downstream end of the cooling flow path; and diverting the cross flow by a flow diverter arranged in the cooling flow path downstream of the first aperture away from at least one second aperture wherein the flow diverter extends from a location between the first aperture and the at least one second aperture in a downstream direction of the cross flow beyond the at least one second aperture, with a first leg extending along one side of the at least one second aperture in the downstream direction of the cross flow and a second leg extending along another side of the at least one second aperture in the downstream direction of the cross flow and wherein no compressed gas is injected for impingement in a first convective cooling section of the wall which is a wall section between an upstream end and a downstream end of the flow diverter outside a section shielded by the flow diverter, injecting the compressed gas through the at least one second aperture in a section between the first leg and the second leg of the flow diverter, wherein a cross section for the cross flow is reduced at a location of the at least one second aperture in the direction of the cross flow relative to the cross section of the cooling flow path upstream of the flow diverter, and wherein the flow diverter extends from the impingement sleeve and connecting to an outer surface of the wall. 16. A method for impingement cooling a wall according to claim 15, wherein the cross flow is accelerated when entering the first convective cooling section of the wall. 17. A method for impingement cooling a wall according to claim 15, wherein a cross flow which is flowing through the first convective cooling section flow path which extends from the upstream end of the flow diverter to the downstream end of the flow diverter is decelerated when entering a section of the cooling flow path which extends in the downstream direction from the downstream end of the flow diverter.