重型柴油机二级增压系统匹配仿真研究  

Simulation Study on Two-Stage Turbocharger Matching for Heavy-Duty Diesel Engines

作　　者：赵明昊 殷勇 赵艳婷 郑尊清[1] ZHAO Minghao;YIN Yong;ZHAO Yanting;ZHENG Zunqing(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Dongfeng Commercial Vehicle Technical Center,Wuhan 430056,China)

机构地区：[1]天津大学先进内燃动力全国重点实验室,天津300072 [2]东风商用车有限公司技术中心,武汉430056

出　　处：《内燃机工程》2024年第2期64-74,共11页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51921004)。

摘　　要：为了降低重型柴油机的燃油消耗率,采用GT-POWER软件建立仿真模型,在一台单级可变截面涡轮增压器(variable geometry turbocharger,VGT)柴油机上开展了二级增压匹配与增压系统参数优化工作。仿真结果表明,所提出的二级增压系统在匹配点能够以最高效率运行,在全工况都能提供足够的进气流量;完全关闭低压级废气旁通阀,正交优化高压级废气旁通阀开度和米勒循环度,能够进一步降低二级增压发动机的燃油消耗率;降低级间中冷温度能够降低泵气损失,提高增压压力,温度由100℃降至50℃在标定点能够使燃油消耗率降低约3 g/(kW·h)。对二级增压及参数优化工作的燃油消耗率改善效果进行了试验验证,低速工况燃油消耗率整体有所下降,高效点燃油消耗率下降4.1%。In order to reduce the fuel consumption rate of a heavy-duty diesel engine,the matching of a two-stage turbocharger using GT-POWER software was carried out on a single stage variable geometry turbocharger(VGT)diesel engine.Simulation results show the proposed two-stage turbocharging system can operate at peak efficiency at the matching point and provide sufficient intake airflow across all operating conditions.Fully closing the wastegate valve in the low-pressure stage and synergistically optimizing the wastegate valve opening in the high-pressure stage along with Miller cycle valve closing angle can further reduce the fuel consumption rate of the two-stage turbocharged engine.Furthermore,reducing the intercooler temperature between stages can reduce pumping losses and enhance boost pressures.Specifically,a temperature reduction from 100℃to 50℃at the rated point can result in an approximate improvement of 3 g/(kW·h)in fuel consumption rate.Experimental validation of the improvement in fuel efficiency from the two-stage turbocharging system was conducted,revealing reduction in fuel consumption rates during low-speed operating conditions and reduction of 4.1%in fuel consumption rate at the high-efficiency operating point.

关 键 词：柴油机 二级增压 增压匹配 遗传算法 燃油消耗率 

分 类 号：TK421.8[动力工程及工程热物理—动力机械及工程]