Experimental study on the spiral and oval spiral EGR cooler efficiencies in a diesel engine

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• 作者：Sang-Ki Park (1)
  Jungkoo Lee (1)
  Hyung-Man Kim (1)
  
• 刊名：Heat and Mass Transfer
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：50
• 期：12
• 页码：1783-1789
• 全文大小：1,276 KB
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• 作者单位：Sang-Ki Park (1)
  Jungkoo Lee (1)
  Hyung-Man Kim (1)
  
  1. Department of Mechanical Engineering and High Safety Vehicle Core Technology Research Center, INJE University, 607 Eobang-Dong, Gimhae-si, Gyeongnam-do, 621-749, Republic of Korea
  
• ISSN：1432-1181

文摘

The cooled exhaust gas recirculation (EGR) system is one of the most effective techniques currently available for reducing nitrogen oxide emissions in diesel engine. Because the combustion characteristics in diesel engine involves high temperature and load, the amount of particulate matter (PM) emission tends to increase, thereby the PM fouling in EGR cooler degrades the heat transfer performance considerably, which in turn has a significant influence on the design of the EGR cooler. In the present study, engine dynamometer tests are performed to investigate the influences of PM fouling on the heat exchange characteristics of spiral and oval-spiral type EGR coolers equipped with a diesel engine. The evaluation test results show that the oval-spiral type EGR cooler has higher efficiency by approximate 10?% than the spiral type EGR cooler because of the increase of heat transfer area and the increased removal of PM from the deposit layer due to fluid shear force.