涡轮端旁通阀开度对增压柴油机排放和热效率的影响.pdfVIP

中国内燃机学会燃烧节能净化分会2010 年学术年会 CSICE2010-134 涡轮端旁通阀开度对增压柴油机排放和热 效率的影响 韩志强、苏万华、战强、陈礼勇、刘二喜、吴松林 (天津大学 内燃机燃烧学国家重点实验室，天津 300072) 摘要：在两级增压气路系统中，排气背压大于进气压力的情况下，提高进气压力能促使重型柴油机排放得 到改善，但往往伴随着柴油机有效热效率的下降。本文通过对进气门晚关装置（IVCA）的合理使用，以及 对涡轮端旁通阀开度的灵活控制，力图在满足重型柴油机排放的基础上，提高其热效率。研究表明：根据 目前已匹配的两级增压器，柴油机在中高转速下，随着涡轮端旁通阀的开启，能找到一些排放基本不恶化， 但有效热效率提高的工况点。 关键词：两级涡轮增压、旁通阀、有效热效率、进气压力、排气背压； Effect of Exhaust Emissions and Thermal Efficiency by Opening the Turbine Bypass Valve on Turbocharged Diesel Engine Zhiqiang Han、Wanhua Su、Qiang Zhan、Liyong Chen、Erxi Liu、Songlin Wu (State Key Laboratory of Engine, Tianjin University 300072, China) Abstract: With the increasing of the intake pressure from a two-stage turbocharged heavy-duty diesel engine could improve the exhaust emissions, when backpressure of engine was higher than intake pressure. However, it also could decrease effective thermal efficiency. The author tried to both improve the exhaust emissions and increase effective thermal efficiency by reasonably using IVCA and deftly controlling turbine bypass valve. The research showed that using a two-stage turbocharger which was running before, it could find some condition which not only had a good exhaust emissions, but also had a better effective thermal efficiency by heavy-duty diesel under middle or high speed ,according to increasing of opening the turbine bypass valve Key words: Two-stage turbocharger, Bypass valve, effective thermal efficiency, Intake pressure, Backpressure; 柴油机的热效率是目前内燃机领域研究的 1前言 热点。 随着人类工业的快速发展，各国对能源 增压技术由于其在节能、提高功率和降 的依赖不断增强，面对日益枯竭的石油资 低排放等方面具有无可比拟的优点，被众多 源，各国的科学家一方面致力于努力寻找新 柴油机广泛采用[1]。在低温燃烧中，由于大 的可再生或非可再生替代燃料；另一方面， EGR 率技术的运用，改变着火始点和放热速 研发出高效、节能的发动机是科