Whole engine efficiency optimization of twostage VNT seriesparallel system for diesel engines
-
摘要: 为提高柴油机的余热回收利用率,提出一种基于可变喷嘴环式涡轮VNT(variable nozzle turbine)技术的两级涡轮混联系统。该系统根据柴油机运行工况,通过控制阀门的开闭来实现混联系统中串联工作模式和并联工作模式的转换。以涡轮的有效直径为参数来表征涡轮的流通能力,利用GT-Power仿真平台研究了两种工作模式下增压涡轮和动力涡轮的流通能力对发动机功率、动力涡轮功率及涡轮增压器性能的影响规律;提出了增压涡轮、动力涡轮与发动机的匹配策略;以系统整机效率最优为目标,针对柴油机不同运行工况进行混联方式的优化控制。结果表明:针对柴油机的不同运行工况,通过两级VNT复合系统混联优化运行方案,能够有效回收柴油机废气能量,额定工况下系统整机效率提高5.1%。
-
关键词:
- 柴油机 /
- 混联 /
- 可变喷嘴环式涡轮(VNT) /
- 有效直径 /
- 整机效率
Abstract: A twostage turbine seriesparallel system based on VNT(variable nozzle turbine) was proposed to recover waste heat from the diesel engine. The system adopted valves to control the system and accomplish the transformation of the series or parallel working modes. And the system was established under the concept of parallel and series working modes separately, and effective diameter was chosen as the parameter to define the flow capability of the turbine. Besides, the influences of the effective diameters of the twostage turbines on the engine power, the power turbine power and the turbocharger performance were analyzed via GTPower, and the effective diameters of the twostage turbines were matched according to the engine working condition. And the series or parallel working mode was controlled by the maximum value of the whole engine efficiency at the specific working condition of the diesel engine. Results showed that through the proper optimization and combination of the twostage VNT and seriesparallel working mode, the system could recover waste heat effectively and improve the whole engine efficiency by 51% during the back tracking period. -
[1] FU Jianqin,LIU Jingping,YANG Yanping,et al.A study on the prospect of engine exhaust gas energy recovery[R]Wuhan:International Conference on Electric Information and Control Engineering,2011. [2] TAYLOR A M K P.Science review of internal combustion engines[J].Energy Policy,2008,36(12):4657-4667. [3] BRIGGS I,MCCULLOUGH G,SPENCE S,et al.A parametric study of an exhaust recovery turbo generator on a dieselelectric hybrid bus[R].ASME Paper GT2013-94492,2013. [4] ISMAIL Y,DURRIEU D,MENEGAZZI P,et al.Potential of exhaust heat recovery by turbocompounding[R].Malmo,Sweden:International Powertrains,Fuels and Lubricants Meeting,2012. [5] ISMAIL Y,CHESSE P,CHALET D,et al.Study of parallel turbocompounding for small displacement engines[R].Detroit,Michigan,USA:Society of Automotive Engineers World Congress,2013. [6] MAMAT A M I,ROMAGNOLI A,MARTINEZBOTAS R F.Characterisation of a low pressure turbine for turbocompounding applications in a heavily downsized mildhybrid gasoline engine[J].Energy,2014,64(1):3-16. [7] WEI Wei,ZHUGE Weilin,ZHANG Yangjun,et al.Comparative study on electric turbocompounding systems for gasoline engine exhaust energy recovery[R].ASME Paper GT2010-23204,2010. [8] DING Zhanming,ZHUGE Weilin,ZHANG Yangjun,et al.Performance analysis of an electric turbocompounding system for a hybrid vehicle diesel engine[R].ASME Paper GT2015-43068 ,2015. [9] MAMAT A M I,PADZILLAH M H,ROMAGNOLI A,et al.A high performance low pressure ratio turbine for engine electric turbocompounding[R].ASME Paper GT2011-45541,2011. [10] KANT M,ROMAGNOLI A,MAMAT A M I,et al.Heavyduty engine electric turbocompounding[J].Proceedings of the Institution of Mechanical Engineers:Part D Journal of Automobile Engineering,2014,229(4):457-472. [11] BRIGGS I,MCCULLOUGH G,SPENCE S,et al.Waste heat recovery on a dieselelectric hybrid bus using a turbogenerator[R].Society of Automotive Engineers,SAE Paper 2012-01-1945,2012. [12] KATSANOS C O,HOUNTALAS D T,ZANNIS T C.Simulation of a heavyduty diesel engine with electrical turbocompounding system using operating charts for turbocharger components and power turbine[J].Energy Conversion and Management,2013,76:712-724. [13] MAMAT A M I B,MARTINEZBOTAS R F,RAJOOS,et al.Design methodology of a low pressure turbine for waste heat recovery via electric turbocompounding[J].Applied Thermal Engineering,2016,107:1166-1182. [14] ZHAO Rongchao,ZHUGE Weilin,ZHANG Yangjun,et al.Study of twostage turbine characteristic and its influence on turbocompound engine performance[J].Energy Conversion and Management,2015,95:414-423. [15] MAMAT A M I B,MARTINEZBOTAS R F,RAJOO S,et al.Waste heat recovery using a novel high performance low pressure turbine for electric turbocompounding in downsized gasoline engines:experimental and computational analysis[J].Energy,2015,90(1):218-234. [16] PESIRIDIS A,JYE A E T S,RAJOO S,et al.Effects of mechanical turbo compounding on a turbocharged diesel engine[R].SAE (Society of Automotive Engineers) International 2013-01-0103,2013. [17] HOUNTALAS D T,KATSANOS C O,LAMARIS V T.Recovering energy from the diesel engine exhaust using mechanical and electrical turbocompounding[R].SAE (Society of Automotive Engineers) International 2007-01-1563,2007. [18] ZHUGE Weilin,HUANG Lei,WEI Wei,et al.Optimization of an electric turbo compounding system for gasoline engine exhaust energy recovery[R].SAE (Society of Automotive Engineers) International 2011-01-0377,2011.
点击查看大图
计量
- 文章访问数: 709
- HTML浏览量: 3
- PDF量: 667
- 被引次数: 0