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Experimental response surface study of the effects of low-pressure exhaust gas recirculation mixing on turbocharger compressor performance

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  • Reihani, Amin
  • Hoard, John
  • Klinkert, Stefan
  • Kuan, Chih-Kuang
  • Styles, Daniel
  • McConville, Greg

Abstract

In Low-Pressure Exhaust Gas Recirculation (LP-EGR), clean exhaust gas is extracted downstream of the after treatment, and reintroduced upstream of the turbocharger compressor. A major pathway for engine fuel economy improvement, by employing LP-EGR, is the enhancement of compressor and turbine efficiencies by increased flow rates which moves the operating points towards higher efficiencies. However, what is often overlooked in the literature is the influence of LP-EGR/air mixing flow field on the compressor performance. Here, we systematically study this effect on a turbocharger unit for a diesel engine on a hot gas stand using response surface methodology. In addition, the mixing flow field of LP-EGR and air upstream of the compressor was scanned using a 3-dimensional directional probe. A reconfigurable T-junction mixer geometry was used, enabling the study of major mixing parameters such as mixing length, and EGR introduction angle.

Suggested Citation

  • Reihani, Amin & Hoard, John & Klinkert, Stefan & Kuan, Chih-Kuang & Styles, Daniel & McConville, Greg, 2020. "Experimental response surface study of the effects of low-pressure exhaust gas recirculation mixing on turbocharger compressor performance," Applied Energy, Elsevier, vol. 261(C).
    • Handle: RePEc:eee:appene:v:261:y:2020:i:c:s0306261919320367
    DOI: 10.1016/j.apenergy.2019.114349
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    References listed on IDEAS

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    4. Zamboni, Giorgio & Capobianco, Massimo, 2012. "Experimental study on the effects of HP and LP EGR in an automotive turbocharged diesel engine," Applied Energy, Elsevier, vol. 94(C), pages 117-128.
    5. Cornolti, L. & Onorati, A. & Cerri, T. & Montenegro, G. & Piscaglia, F., 2013. "1D simulation of a turbocharged Diesel engine with comparison of short and long EGR route solutions," Applied Energy, Elsevier, vol. 111(C), pages 1-15.
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