基于增压发动机耦合仿真的涡轮性能预测模型研究

Research on Turbine Performance Prediction Coupled with Turbocharged Internal Combustion Engine Model

针对发动机排气管来流条件下涡轮一维性能预测模型进行深入研究,建立脉动与空间不均匀来流条件下涡轮性能预测模型,该模型预测得到的涡轮流通能力与试验误差小于2.0%。将该模型与发动机性能预测模型耦合,开发增压发动机自主性能仿真软件,试验验证结果表明发动机整机的性能预测误差小于3.5%。基于该模型,进一步构建了涡轮与发动机耦合匹配方法,并通过双通道涡轮几何优化设计,实现了发动机功率提升2.7%,同时燃油消耗率降低1.6%。

A one-dimensional turbine performance model was investigated under real engine exhaust environment.The model is capable of performance prediction under pulsating boundary conditions and twin-entry scroll configurations.The discrepancies between experimental and simulated results were less than 2.0%.This turbine model was further coupled with a one-dimensional engine code and an in-house engine performance prediction software was developed.The maximum discrepancy of the whole engine model was 3.5%.A joint engine-turbine design method was further developed based on this model and thus turbine geometries could be considered in the engine design process.A newly designed twin-entry turbine was coupled with the turbocharged engine.The engine power and brake specific fuel consumption could be improved by 2.7%and 1.6%.