可变压缩比对增压中冷柴油机性能影响的模拟分析
Simulation analysis on effect of variable compression ratio on turbocharged and inter-cooled diesel engine performance
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摘要: 为计算可变压缩比技术对柴油机燃油经济性和排放性能的影响，该文通过GT-Power软件，对一台装备有中冷废气再循环系统和可变几何涡轮增压系统的C6.6重型柴油机进行了建模和仿真分析，并采用了直喷燃烧预测模型对模型的有效性进行了验证。研究结果表明，可变压缩比技术使柴油机中、低负荷下燃油经济性的改善可达7.2％，再结合适当的废气再循环（exhaust gas recirculation，EGR）率和可变几何涡轮增压系统（variable geometry turbocharger，VGT）控制策略，柴油机的NOx和颗粒物的排放性能可达到欧洲5号标准瞬态测试循环（european transient cycle，ETC）中的排放要求。因此,可变压缩比技术可以有效改善直喷柴油机的燃油经济性,提高排放性能。Abstract: In order to investigate the effect of variable compression ratio (VCR) on fuel economy and emission reduction, a model of the heavy duty diesel engine C6.6 equipped with inter-cooling exhaust gas recirculation (EGR) and a variable geometry turbocharger (VGT) was presented and analyzed based on the GT-Power software and its validity was verified with a predictive direct-injection jet combustion model. The simulation results showed that the use of variable compression ratio improved fuel economy to 7.2% at low and medium load, also NOx and soot emissions could meet the need of Euro V values for ETC with corresponding EGR fraction and VGT strategy. Variable compression ratio can improve the fuel economy and emission performance of direct injection diesel engine effectively.
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