Division wall and shroud of gas turbine
The division wall is made up of a plurality of division wall sections forming a passage wall of high temperature gas which are connected in the direction of arrangement of blades to form a wall surface having a roughly circular cross section as a whole, a gas flow restricting structure for preventing high temperature gas from passing through a gap formed at a connecting portion between the division wall sections in the flow direction of the high temperature gas from the opening on the upstream side of the high temperature gas in the gap, or a gas flow restricting structure for preventing the high temperature gas from being embraced in the gap, for example, a sealing member formed into a prism having a T-shape cross section as a whole composed of a plane portion as a sealing portion and a projected portion for filling the gap is provided.
1. A wall of a gas turbine, comprising:
a plurality of wall sections connected in the direction of a set of blades in the gas turbine and forming a wall surface having a substantially circular cross section, the wall sections being fixed to an outer end or an inner end of the set of blades in the gas turbine, or being positioned to interpose a predetermined space between the outer end of the set of blades and forming a passage wall for high temperature gas together with a blade surface of the respective blade; and
a plurality of gas flow restricting devices positioned in gaps formed between the wall sections, respectively, and configured to restrict the high temperature gas from flowing in the gaps along axial and radial directions of the gas turbine,
wherein the plurality of wall sections have side end wall surfaces in the gaps, and the side end wall surfaces have blowoff openings for blowing cooling air into the gaps.
2. The wall according to claim 1 , wherein the set of blades comprises a plurality of stationary blades and the wall is a shroud.
3. The wall according to claim 1 , wherein the set of blades comprises a plurality of moving blades and the wall is a platform.
4. The wall according to claim 1 , wherein the set of blades comprises a plurality of moving blades and the wall is a ring wall provided in a compartment and interposing the predetermined space from tip ends of the moving blades.
5. The wall according to claim 1 , wherein the plurality of gas flow restricting devices comprises a plurality of sealing devices each having a projection portion configured to fill a respective one of the gaps so as to prevent the high temperature gas from leaking outside the passage wall.
6. The wall according to claim 1 , wherein the plurality of gas flow restricting comprises a plurality of shielding panels positioned to close end openings on the upstream side of the high temperature gas in the gaps, respectively.
7. The wall according to claim 1 , further comprising a plurality of cooling air blowoff devices configured to blow cooling air into the gaps, respectively, wherein the plurality of cooling air blowoff devices comprises a plurality of blowoff passages formed in the sealing members, respectively.
8. A wall of a gas turbine, comprising:
a plurality of wall sections connected to form a wall body having a substantially circular cross section, the wall sections fixing an outer end or an inner end of a set of blades thereon, or being positioned to interpose a predetermined space between the outer end of the set of blades and forming a passage wall for high temperature gas; and
a gas flow restricting device provided in fans formed between the wall sections, respectively, and configured to restrict the high temperature gas from flowing in the gaps along axial and radial directions of the gas turbine,
wherein the plurality of wall sections have side end wall surfaces in the gaps, and the side end wall surfaces have blowoff openings for blowing cooling air into the gaps.