内燃机工程2020，Vol.41Issue(1)：27-35,9.DOI:10.13949/j.cnki.nrjgc.2020.01.004
高原环境下柴油机可变两级增压协同主喷定时的工作过程模拟
Simulation of Working Process of Diesel Engine Equipped with Regulated Two-Stage Turbocharger System Coordinated with Main Injection Timing Strategy at Plateau
摘要
Abstract
Based on an 1D thermodynamics model set up with the GT-power, the comparative simulation study on the performance of a diesel engine equipped respectively with a two-stage turbocharger(TST) system and a regulated two-stage turbocharger(RTST) system at different altitudes(0 km, 2 km and 2 km) was carried out to achieve high efficiency and low emissions of diesel engines in a plateau environment. The results show that，at full load，the high stage boosting rates of both two-stage turbocharger systems increase with the altitude. Compared with TST, RTST guarantees higher intake air flow and air/fuel ratio(AFR) at the plateau of 2 km and 4 km, thus having less restrain in torque and reducing the brake specific fuel consumption(BSFC). The temperature before turbocharger and heat transfer energy of TST and RTST increase similarly with the altitude，but those of RTST increase less. At the low altitude of 2 km, the specific emissions of NOX increase with the altitude. At the altitude of 4km, when the opening of the variable geometry turbocharger(VUT) decreases and the start of main injection(SOI) delays, both the intake air flow and AFR increase. With the increase of the VGT opening and the delay of SOI，the temperature before turbocharger rises. The heat transfer energy decreases first and then increases with the increase in the VGT opening，and decreases with the delay of SOI. NOx specific emissions decrease with the increase in the VGT opening, and decrease slightly with the delay of SOI. Earlier SOI(-7°～- 4°20 in crank angle after the top dead center) coordinated with reasonable VGT opening (0. 3～ 0.5) is beneficial to reducing the trade-off between BSFC and NOx specific emissions.关键词
重型柴油机/高原环境/可变两级增压系统/主喷定时/工作特性Key words
heavy-duty diesel engine/ regulated two stage turbocharger system/main injection timing/altitude/ working characteristics分类
能源科技引用本文复制引用
刘海军1,2,侯献军2,陈贵升3,王友恒2,江华2..高原环境下柴油机可变两级增压协同主喷定时的工作过程模拟[J].内燃机工程,2020,41(1):27-35,9.基金项目
内蒙古自治区高等学校科学技术研究项目(NJZY17405) （NJZY17405）
国家重点研发计划项目(2018YFB0106401) （2018YFB0106401）
