A study on the effects of the intake port configurations on the swirl flow generated in a small D.I. diesel engine

Yungjin Kim, Yongtaek Han, Kihyung Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection (D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects on fuel-air mixing, combustion, and emissions. To clarify how to intensify the swirl flow, a swirl control valve (SCV) and a bypass were selected as design parameters for enhancing the swirl flow. The optimal intake port shape was also chosen as a parameter needed to efficiently generate a high swirl ratio. The results revealed that a key factor in generating a high swirl ratio was to control the intake airflow direction passing through the intake valve seat. Further, the swirl intensity was influenced by changing the distance between the helical and tangential ports, and the swirl flow was changed by the presence of a bypass near the intake valve seat. Additionally, the effect of intake port geometry on the in-cylinder flow field was investigated by using a laser sheet visualization method. The experimental results showed a correlation of swirl ratio and mass flow rate. In addition, we found that employing the bypass was an effective method to increase swirl ratio without sacrificing mass flow rate.

Original languageEnglish
Pages (from-to)297-306
Number of pages10
JournalJournal of Thermal Science
Volume23
Issue number3
DOIs
Publication statusPublished - Jun 2014

Keywords

  • HSDI(high speed direct injection)
  • ISM(impulse swirl meter)
  • PIV(particle image velocimetry)
  • helical intake port
  • intake flow rate
  • swirl ratio

ASJC Scopus subject areas

  • Condensed Matter Physics

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