Axial-flow thermal turbomachine
View Patent ↗The invention relates to an axial-flow thermal turbomachine, having a rotor ( 1 ) made from a metallic material with a first density (D 1 ), in which rotor blades ( 3, 3 ′) and intermediate pieces ( 4 ) are mounted alternately in a circumferential groove. It is characterized in that said intermediate pieces ( 4 ) consist of a material with a second density (D 2 ), which is lower than the first density (D 1 ). Particularly suitable materials for the intermediate pieces ( 4 ) are intermetallic compounds, preferably intermetallic γ-titanium aluminide alloys or intermetallic orthorhombic titanium aluminide alloys, but also titanium alloys.
1. An axial-flow thermal turbomachine comprising:
a rotor made from a metallic material with a first density (D 1 );
a circumferential groove; and
rotor blades and intermediate pieces alternatingly mounted in the circumferential groove;
wherein said intermediate pieces comprise a material with a second density (D 2 ) lower than the first density (D 1 ).
2. The turbomachine as claimed in claim 1 , wherein the material having the second density (D 2 ) comprises an intermetallic compound.
3. The turbomachine as claimed in claim 2 , wherein said intermetallic compound comprises an alloy selected from the group consisting of a y-titanium aluminide alloy and an orthorhombic titanium aluminide alloy.
4. The turbomachine as claimed in claim 3 , wherein said γ-titanium aluminide alloy has the following chemical composition (in % by weight): Ti-(30.5–31.5)Al-(8.9–9.5)W-(0.3–0.4)Si.
5. The turbomachine as claimed in claim 1 , wherein the material having the second density (D 2 ) comprises a titanium alloy.
6. The turbomachine as claimed in claim 1 , wherein the turbomachine comprises a gas turbine having a high-pressure compressor with a rotor which comprises a stainless Cr—Ni steel.