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Variable-geometry turbocharger with asymmetric divided volute for engine exhaust gas pulse optimization
Variable-geometry turbocharger with asymmetric divided volute for engine exhaust gas pulse optimization
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机译:具有不对称分体蜗壳的可变几何涡轮增压器,用于优化发动机排气脉冲
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摘要
A turbine assembly for a variable-geometry turbocharger includes a turbine housing defining a divided volute having first and second scrolls, wherein the first scroll has a substantially smaller volume than the second scroll. The first scroll feeds exhaust gas to a first portion of a turbine wheel upstream of the throat of the wheel, while the second scroll feeds gas to a second portion of the wheel at least part of which is downstream of the throat. Flow from the second scroll is regulated by a sliding piston. The first scroll can be optimized for low-flow conditions such that the turbocharger can operate effectively like a small fixed-geometry turbocharger when the piston is closed. The turbine housing defines an inlet that is divided by a dividing wall into two portions respectively feeding gas to the two scrolls, a leading edge of the dividing wall being downstream of the inlet mouth.
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