Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on the Characteristic and Droplet Uniformity of Spray Injection to Exhaust Gas Flow from Urea Solution Injector

Urea 수용액의 배기가스 유동장내 분무 특성과 분무 균일도에 관한 연구

  • Oh, Jung-Mo (Graduate School of Mechanical Engineering, Hanyang University) ;
  • Cha, Won-Sim (Graduate School of Mechanical Engineering, Hanyang University) ;
  • Kim, Ki-Bum (Department of Mechanical Engineering, Chungbuk National University) ;
  • Lee, Jin-Ha (Hyundai-Motor Company) ;
  • Lee, Ki-Hyung (Department of Mechanical Engineering, Hanyang University)
  • 오정모 (한양대학교 대학원 기계공학과) ;
  • 차원심 (한양대학교 대학원 기계공학과) ;
  • 김기범 (충북대학교 기계공학부) ;
  • 이진하 (현대자동차 배기연구팀) ;
  • 이기형 (한양대학교 기계공학과)
  • Received : 2010.06.18
  • Accepted : 2010.12.06
  • Published : 2011.05.01
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Abstract

Diesel engines can produce higher fuel efficiency and lower $CO_2$ emission, they are subject to ever more stringent emission regulation. However, there are two major emission concerns fo diesel engines like such as particulate matter (PM) and nitrogen oxides (NOx). Moreover, it is not easy to satisfy the regulations on the emission of NOx and PM, which are getting more strengthened. One of the solutions is to apply the new combustion concept using multistage injection such as HCCI and PCCI. The other solution is to apply after-treatment systems. For example, lean NOx trap catalyst, Urea-SCR and others have various advantages and disadvantages Especially, Urea-SCR system have advantages such as a high conversion efficiency and a wide operation conditions. Hence the key factor to implementation of Urea-SCR technology, good mixing of urea(Ammonia) and gas, reducing Ammonia slip. Urea mixer components are required to facilitate evaporation and mixing because the liquid state of urea poses significant barriers for evaporation, and the distance to mixer is the most critical that affect mixer performance. In this study, to find out the distance from injector to mixer and simulation factor, a laser diagnostics and high speed camera are used to analyze urea injector spray characteristics and to present a distribution of urea solution in transparent manifold In addition, Droplet Uniformity Index is calculated from the acquired images by using image processing method to clarify the distribution of spray.

Keywords

References

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