两缸增压中冷柴油机涡轮增压器流动特性分析
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- 英文论文题名：Flow Characteristics Analysis of Turbocharger of Two-cylinder Diesel Engines
- 论文作者：刘慧杰 ; 李振坤 ; 周玉雷
- 英文论文作者：Liu Huijie ; Li Zhenkun ; Zhou Yulei ; BAIC Motor Co. ; Ltd.R&D Center
- 年：2016
- 作者机构：北京汽车股份有限公司汽车研究院;
- 论文关键词：2缸增压柴油机 ; 耦合计算 ; 涡轮效率 ; 排气压力波动
- 英文论文关键词：2 cylinder turbocharged diesel engine ; coupling calculation ; turbine efficiency ; the exhaust pressure fluctuations
- 会议召开时间：2016-10-26
- 会议录名称：2016中国汽车工程学会年会论文集
- 英文会议录名称：Proceedings of 2016 SAE-China Congress
- 语种：中文
- 分类号：U464.172
- 学会代码：QCGC
- 会议名称：2016中国汽车工程学会年会暨展览会
- 会议地点：中国上海
- 主办单位：中国汽车工程学会
- 学会名称：中国汽车工程学会
- 页数：4
- 文件大小：985k
- 原文格式：O
- 会议级别：全国
摘要
两缸柴油机采用360℃A发火间隔角,在工作周期中会出现进气和排气空档角,导致进排气压力波动较大,引起涡轮效率的下降。针对这一问题,建立了2缸柴油机整机一维模型,并对涡轮内部流场进行数值模拟计算。研究结果表明:涡轮叶片表面流体切应力在入口压力最大时最大切应力为1748.9Pa,入口压力最小时最大切应力为1539.8Pa,切应力变化了209.1Pa,存在较大的切应力波动,使叶片产生较大的切应力,造成涡轮叶片疲劳损使涡轮效率降低;排气压力波动对涡轮内流场影响较大,变化的排气压力对涡轮叶片的冲击较强,影响涡轮叶片使用寿命。
two cylinder diesel engines use 360℃ A firing interval angle,intake and exhaust slot angle exist in the working cycle,resulting in great intake and exhaust pressure fluctuation,which causes a obvious decrease in turbine efficiency.In view of this problem,a one dimensional model of 2 cylinder diesel engine is built,and numerical simulation of the internal flow field of the turbine is carried out.Results show that:The maximum shear stress of the turbine blade surface fluid shear stress is 1748.9Pa at the maximum inlet pressure,the maximum shear stress is 1539.8Pa at the minimum inlet pressure,Shear stress changed 209.IPa,large shear stress fluctuation,causes the blade a larger shear stress and inclination in turbine blade fatigue damage thus decreases the efficiency of the turbine;The exhaust pressure fluctuation has great influence on the flow field of the turbine,The fluctuation of the exhaust pressure has a strong impact on the turbine blade,reducing the life of the turbine blade.
two cylinder diesel engines use 360℃ A firing interval angle,intake and exhaust slot angle exist in the working cycle,resulting in great intake and exhaust pressure fluctuation,which causes a obvious decrease in turbine efficiency.In view of this problem,a one dimensional model of 2 cylinder diesel engine is built,and numerical simulation of the internal flow field of the turbine is carried out.Results show that:The maximum shear stress of the turbine blade surface fluid shear stress is 1748.9Pa at the maximum inlet pressure,the maximum shear stress is 1539.8Pa at the minimum inlet pressure,Shear stress changed 209.IPa,large shear stress fluctuation,causes the blade a larger shear stress and inclination in turbine blade fatigue damage thus decreases the efficiency of the turbine;The exhaust pressure fluctuation has great influence on the flow field of the turbine,The fluctuation of the exhaust pressure has a strong impact on the turbine blade,reducing the life of the turbine blade.
引文
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[7]肖昕,李云清.车用涡轮增压器蜗壳内三维流场模拟分析[J].汽车技术,2011(9):1-3.
[8]杜鹃,张翼,杨帆,等.增压器涡轮内部通道的流动特性分析[J].小型内燃机与摩托车,2010,39(005):44-46.
[2]张虹,马朝臣.车用涡轮增压器压气机叶轮强度计算与分析[J].内燃机工程,2007,28(1):62-66.
[3]胡友安,李晓东,陈图钧.蜗壳温度场和热应力的有限元分析[J].机械强度,2007,29(1):130-134.
[4]梁晓瑜,毕玉华,申立中,等.涡轮增压器压气机内部流场的CFD分析[J].小型内燃机与摩托车,2007,36(5):12-14.
[5]陈朝辉,毕玉华,申立中,等.涡轮增压器压气机叶片模态特性分析[J].拖拉机与农用运输车,2006,4:28-29.
[6]李惠彬,周鹂麟,孙恬恬,等.涡轮增压器叶轮流固耦合模态分析[J].振动测试与诊断,2008,28(3):252-255.
[7]肖昕,李云清.车用涡轮增压器蜗壳内三维流场模拟分析[J].汽车技术,2011(9):1-3.
[8]杜鹃,张翼,杨帆,等.增压器涡轮内部通道的流动特性分析[J].小型内燃机与摩托车,2010,39(005):44-46.