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Effects of Injector Design Parameter on Nozzle Coking in Diesel Engines

디젤 엔진의 인젝터 설계 변수가 노즐 코킹에 미치는 영향 분석

  • 김용래 (한국기계연구원 그린동력연구실) ;
  • 송한호 (서울대학교 기계항공공학부)
  • Received : 2012.07.20
  • Accepted : 2012.09.03
  • Published : 2012.09.30

Abstract

Recent common-rail injector of a diesel engine needs more smaller nozzle hole to meet the stringent emission regulation. But, small nozzle hole diameter can cause nozzle coking which is occurred due to the deposits of post-combustion products. Nozzle coking has a negative effect on the performance of fuel injector because it obstructs the fuel flow inside a nozzle hole. In this study DFSS (Design for six sigma) method was applied to find the effect of nozzle design parameter on nozzle coking. Total 9 injector samples were chosen and tested at diesel engine. The results show that nozzle hole diameter and K-factor have more effect on nozzle coking than A-mass and hole length. Large hole diameter and A-mass, small hole length and K-factor give more positive performance on nozzle coking in these experimental conditions. But, a performance about nozzle coking and exhaust gas emission shows the opposite tendency. Further study is needed to find the relation between nozzle coking and emission characteristic for the optimization of injector nozzle design.

Keywords

References

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Cited by

  1. Study on Optimization of Fuel Injection Parameters and EGR Rate of Off-road Diesel Engine by Taguchi Method vol.22, pp.7, 2014, https://doi.org/10.7467/KSAE.2014.22.7.084
  2. Design Sensitivity Estimation of Injector Nozzle Hole Considering Cavitation vol.37, pp.11, 2013, https://doi.org/10.3795/KSME-A.2013.37.11.1361