| 摘要 |
Turbulence of exhaust gas in a turbine impeller outlet is reduced with a simple structure to improve efficiency of a turbine. A sealing device 25 for prevention of exhaust gas in a scroll passage 8 from leaking via a gap 19 to a turbine impeller 4 is arranged upstream, in a travel direction of the exhaust gas, of through-holes 24 via which the vane shafts 16b extend through a rear exhaust introduction wall 11, whereby pressure P2 in a gap 19 communicating with the through-holes 24 of the rear wall 11 is kept lower than pressure P1 in an exhaust nozzle 9 so as to displace nozzle vanes 15 to the rear wall 11.
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