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
赵明昊 1殷勇 2赵艳婷 2郑尊清1
作者信息
- 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
- 折叠
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%.
Abstract
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Key words
diesel engine/two-stage turbocharging/turbocharger matching/genetic algorithm/fuel consumption rate引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据