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Influence of speed and frequency towards the automotive turbocharger turbine performance under pulsating flow conditions

机译：脉动条件下速度和频率对汽车涡轮增压器涡轮性能的影响

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摘要

The ever-increasing demand for low carbon applications in automotive industry has intensified the development of highly efficient engines and energy recovery devices. Even though there are significant developments in the alternative powertrains such as full electric, their full deployment is hindered by high costing and unattractive life-cycle energy and emission balance. Thus powertrain based on highly efficient internal combustion engines are still considered to be the mainstream for years to come. Traditionally, turbocharger has been an essential tool to boost the engine power, however in recent years it is seen as an enabling technology for engine downsizing. It is a well-known fact that a turbocharger turbine in an internal combustion engine operates in a highly pulsating exhaust flow. There are numerous studies looking into the complex interaction of the pulsating exhaust gas within the turbocharger turbine, however the phenomena is still not fully integrated into the design stage. Industry practice is still to design and match the turbine to an engine based on steady performance maps. The current work is undertaken with the mind to move one step closer towards fully integrating the pulsating flow performance into the turbocharger turbine design. This paper presents the development efforts and results from a full 3-D CFD model of a turbocharger turbine stage. The simulations were conducted at 30,000 rpm and 48,000 rpm (50% and 80% design speed respectively) for both 20 Hz and 80 Hz pulsating flow inlet conditions. Complete validation procedure using cold-flow experimental data is also described. The temporal and spatial resolutions of the incidence angle at the rotor leading edge suggest that the circumference variation is little (7%) as compared to its variation in time as the pulse progresses. The primary aim of this paper is to investigate the relationship of the turbine speed, as well as the pulsating flow frequency to its performance. It was found that there are no direct instantaneous relationship between the pulsating pressure at the turbine inlet and the turbine efficiency, except when one considers an additional parameter, namely the incidence angle. This paper also intends to investigate the potential loss of information if the performance parameters are simply averaged without considering the instantaneous effects.
机译：汽车行业对低碳应用的不断增长的需求，已加强了高效发动机和能量回收装置的开发。即使诸如全电之类的替代动力总成系统有了重大发展，但其高昂成本以及缺乏吸引力的生命周期能量和排放平衡阻碍了它们的全面部署。因此，基于高效内燃机的动力总成仍被认为是未来几年的主流。传统上，涡轮增压器一直是提高发动机功率的必不可少的工具，但是近年来，涡轮增压器被视为使发动机小型化的一项使能技术。众所周知的事实是，内燃机中的涡轮增压器以高脉动的排气流运行。有许多研究正在研究涡轮增压器涡轮内脉动废气的复杂相互作用，但是这种现象仍未完全整合到设计阶段。工业实践仍然是基于稳定的性能图来设计涡轮机并将其与发动机匹配。当前的工作是怀着更充分的一步，将脉动流性能完全集成到涡轮增压器涡轮设计中。本文介绍了涡轮增压器涡轮级的完整3-D CFD模型的开发成果和结果。对于20 Hz和80 Hz脉动流入口条件，仿真均以30,000 rpm和48,000 rpm（分别为50％和80％设计速度）进行。还描述了使用冷流实验数据的完整验证程序。转子前缘入射角的时间和空间分辨率表明，与脉冲随时间的变化相比，周向变化很小（7％）。本文的主要目的是研究涡轮转速以及脉动流频率与其性能之间的关系。已经发现，在涡轮机入口处的脉动压力与涡轮机效率之间没有直接的瞬时关系，除非当人们考虑附加参数时，即入射角。如果仅对性能参数进行平均而不考虑瞬时影响，则本文还打算研究潜在的信息丢失。

著录项

  • 来源
    《Energy Conversion & Management》 |2014年第4期|416-428|共13页
  • 作者

    M.H. Padzillah; S. Rajoo; R.F. Martinez-Botas;

  • 作者单位

    Department of Mechanical Engineering, Imperial College London, London, United Kingdom;

    UTM Centre for Low Carbon Transport in cooperation with Imperial College London, Universiti Teknologi Malaysia, Johor, Malaysia;

    Department of Mechanical Engineering, Imperial College London, London, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pulsating exhaust flow; CFD; Turbochargers; Experiment validations;

    机译：脉动排气流;差价合约涡轮增压器;实验验证;

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