双流道涡轮增压器对发动机性能的影响分析

Influence Analysison Engine Performance with Twin Channel Turbocharger

随着国家对油耗和排放的限制要求越来越严,汽油发动机小型化发展的趋势越为明显,发动机小型化后对低端性能和瞬态性能要求更为苛刻,双流道增压器相比单流道增压器,可以明显的改善发动机低端性能同时改善发动机瞬态性能,本文首先对双流道涡轮增压器的构造以及工作原理进行分析,进而运用一维热力学分析工具GT-Power建立双流道涡轮增压器的详细模型,分析双流道增压器对发动机稳态性能和瞬态性能的影响,仿真结果表明,相比单流道涡轮增压器,发动机采用双流道涡轮增压器后低速扭矩提高13%,使得发动机的最大扭矩最低转速范围进一步向低转速方向扩展,发动机在1 500 r/min外特性工况的瞬态性能提升18%,在2 000 r/min外特性工况的瞬态性能提升8%。

As countries become more and more strict restrictions on fuel consumption and emissions,miniaturization tendency in gasoline engine is obvious,and the engine after miniaturization for low-end performance and transient performance become more stringent.Comparing with single flow path turbocharger,twin channel turbocharger can obviously improve engine low performance andtransient performance. Firstly,we analysis the structure and operational principle of twin channel path turbocharger. Then we build the detailed simulation model of twin channel turbocharger using GT-Power tools and analysis the steady performance and transient performance of twin flow path turbocharger engine. Simulation results show that comparing with the single flow turbocharger,engine torque at low speed increases by 13% with twin channel turbocharger,and the speed range of maximum torque is extended to low speed. The transient performance of engine in 1 500 r/min is improved 18%. The transient performance of engine in 2 000 r/min is improved 8%.