某V型8缸双增压发动机进气管布置形式优化分析

Optimization analysis on intake pipe layout of V-type diesel engine with 8 cylinders and 2 turbochargers

为提高某V型8缸双增压柴油机的进气均匀性和充气效率,利用GT-Power软件建立匹配2台增压器的柴油机计算模型,仿真分析3种进气管布置方案的发动机各缸进气均匀性、一次加载率、增压器性能及发动机性能等参数。分析结果表明:布置方案C的整体性能、一次加载率、各缸进气均匀性较好且增压器无喘振风险;与方案A、B相比,方案C的整机燃油消耗率降低0.5~1.2 g/(kW·h),充气效率提高1%~2%。该研究可为V型8缸发动机进气系统设计提供参考。

In order to improve intake uniformity and volumetric efficiency of V-type diesel engine with 8 cylinders and 2 turbochargers,GT-Power software is used to model the diesel engine to analyze and investigate cylinder uniformity,single step load rate,turbocharger and engine performance.Three intake layouts are analyzed.The analysis results show that type C shows the best overall performance,single step load rate and cylinder uniformity,and the turbocharger has no surge risk.The fuel consumption of the engine is reduced by 0.5-1.2 g/(kW·h) and higher volumetric efficiency by 1%-2% with type C compared to type A and B.This study can provide reference for the design of intake system of V-type diesel engine with 8 cylinders。