| 摘要 |
An engine system incorporating an air breathing, reciprocating internal combustion engine (10) having an inlet(12) for air and an exhaust (14) for products of combustion. A centripetal turbine (22) receives products of the combustion and has a housing (44) in which a turbine wheel (50) is rotatable. The housing (44) has first and second passages (58, 60) leading from the inlet (46) to discrete, approximately 180°, portions of the circumference of the turbine wheel (50). The passages (58, 60) have fixed vanes (66, 68) adjacent the periphery of the turbine wheel (50) and the angle of the vanes (66, 68) in one of the passages (58, 60) is different than those in the other so as to accommodate different power levels providing optimum approach angles between the gases passing the vanes (66, 68) and the blades (52) of the turbine wheel (50). Flow through the passages (58, 60) is controlled by a flapper valve (70) to direct it to one or the other or both passages (58, 60) depending upon the load factor for the engine (10).
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