EGRクーラ内へのPMの堆積および堆積PMの気流による除去 PM Deposition in an EGR Cooler and Removal of the Deposited PM by Air Flow

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Abstract

ディーゼルエンジンでは排ガス特性改善のためにEGR(排ガス再循環)が採用されているが,排ガス中のPMがEGRクーラ内に堆積することによる熱交換特性の低下が懸念される.本研究ではEGRクーラにディーゼル排ガスを導入し,PMの堆積特性を調査した.さらに,空気流による堆積PMの除去についても検討した.

EGR (Exhaust Gas Recirculation) system with EGR cooler is applied to diesel engines to improve their emission levels. EGR coolers have a problem that the deposition of PM in exhaust gas causes deterioration of their heat exchange performance. In this study, exhaust gas from a diesel engine was introduced into a test EGR cooler, and the deposition of PM in it was investigated experimentally. As a result, the mass of EGR deposit increased with a decrease of the excess air ratio. Moreover, the removal characteristics of the deposited PM by passing through blow-off air were examined.

Journal

  • Transactions of Society of Automotive Engineers of Japan

    Transactions of Society of Automotive Engineers of Japan 42(5), 1117-1123, 2011

    Society of Automotive Engineers of Japan

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