| 摘要 |
A turbine, preferably an exhaust-driven turbine forming part of the supercharger of an internal combustion engine, provided with a mechanism (10) for variable restriction in a peripheral inflow duct (3) leading to a turbine rotor (4) rotatably located in turbine casing (2). The invention is intended to prevent, when throttling the turbine inflow, disturbances of the incoming flow leading to energy loss and to prevent or at least reduce the development of mechanical and thermal stresses in the device controlling the throttling action. In this respect the turbine in accordance with the invention is characterised in that the restriction can be adjusted by radial displacement of an outer wall section in turbine casing (2) forming a boundary of inflow duct (3), in that the said wall section comprises a number of wall elements (16, 17, 18) connected with one another in an articulated manner, with at least two of them supported in an articulated and/or displaceable manner in respect of turbine casing (2), and in that the wall section is at its respective ends arranged to connect, subject to a substantially unchanged inflow duct with fixed wall sections in turbine casing (2), so as to form with the latter a helical inlet leading to turbine rotor (4). |
