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    • 沈颖刚,杨云春,吕誉,等.增压方式对柴油机高原环境下工作特性影响的数值模拟[J].内燃机工程,2021,42(3):47-54.
    Numerical Simulation of Influence of Turbocharged Modes on Working Characteristics of Diesel Engine in Plateau
    DOI：10.13949/j.cnki.nrjgc.2021.03.007
    Key Words:diesel engine  regulated two stage turbocharging systems  plateau  performance
    Author NameAffiliationE-mail
    SHEN Yinggang Yunnan key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology shenyinggang@163.com 
    YANG Yunchun Yunnan key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology  
    LV Yu Yunnan key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology  
    CHEN Guisheng Yunnan key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology cgs_yly@163.com 
    LI Ke National New Energy Vehicle Technology Innovation Center  
    YANG Ruimin Yunnan key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology  
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    Abstract:Based on a high-pressure common rail heavy-duty diesel engine, a one-dimensional thermodynamic simulation model was built. Firstly, the effects of single-stage turbocharged (1TC) and two-stage turbocharged (2TC) on the operational characteristics of diesel engine under variable altitudes were conducted. Afterward, the high-pressure stage of 2TC was replaced with a variable geometry turbocharger to investigate the effects of the blade opening on the performance of the diesel engine at an altitude of 4 km. The results show that compared with 1TC, 2TC can further improve the adaptability of diesel engine to altitude changes, especially in low-speed operational conditions. In low-speed operational conditions, the regulated two stage turbocharging (RTST) systems diesel engine has a maximum torque, highest effective thermal efficiency and lowest break specific fuel consumption (BSFC) when the blade opening were between 40% and 70%. As the speed increases, enlarging the blade opening can reduce the exhaust back pressure and residual exhaust gas in the cylinders, increase the efficiency of the turbocharger, decrease NOx emissions and BSFC; at low-speed operational conditions, the heat transfer loss rate decreases firstly and then increases with the increase of the blade opening. At medium and high-speed operational conditions, the heat transfer loss rate decreases with the increase of the blade opening.
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