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Model-Based Performance of Turbulence Induced Structures in Exhaust Gas Recirculation (EGR) Coolers

机译:基于模型的废气再循环(EGR)冷却器中的湍流诱导结构性能

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摘要

Exhaust gas recirculation (EGR) coolers can profoundly reduce hazardous NOx emissions from diesel engines. Nevertheless, the formation of deposits on EGR surfaces causes design uncertainty and maintenance problems. The present study underlines how changing the EGR surface structure for the same inlet velocity can result in substantial increase in shear stress, which otherwise would be needed for an effective deposit suppression. Various structures have been developed, then studied numerically using computational fluid dynamics. The results have been compared with a baseline flat plate rectangular EGR cooler. The numerical findings show that shear stress is increased from 150 to 350% while the overall pressure drop is always below 550 mbar. The geometrical modifications also cause a minor reduction of up to 7% in effective heat transfer area of EGR.
机译:废气再循环(EGR)冷却器可以从根本上减少柴油机排放的有害NOx。但是,在EGR表面上形成沉积物会导致设计不确定性和维护问题。本研究强调了在相同的入口速度下改变EGR表面结构如何导致剪切应力的大幅增加,否则有效抑制沉积将需要剪切应力。已经开发了各种结构,然后使用计算流体动力学进行了数值研究。将结果与基线平板矩形EGR冷却器进行了比较。数值结果表明,剪应力从150%增加到350%,而总压降始终低于550 mbar。几何形状的变化还会使EGR的有效传热面积减少多达7%。

著录项

  • 来源
    《Heat Transfer Engineering》 |2015年第8期|706-714|共9页
  • 作者单位

    Institute of Thermodynamics and Thermal Engineering, University of Stuttgart, Stuttgart, Germany;

    Institute of Thermodynamics and Thermal Engineering (ITW), University of Stuttgart, Pfaffenwaldring 6, D-70550 Stuttgart, Germany,Department of Chemical, Petroleum and Gas Engineering, Shiraz University, Shiraz, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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