Spray behavior near the nozzle of a DISI Multi-hole injector using phase doppler anemometer

Fatma Ahmed, Nobuyuki Kawahara, Eiji Tomita, Mamoru Sumida

Research output: Contribution to conferencePaper

Abstract

The spray from a multi-hole injector applied to direct injection spark ignition (DISI) engine was investigated. The spray has been injected into a constant volume chamber and has been visualized with a high speed video camera with a long distance microscope and quantified in terms of droplet velocity and diameter with HiDense PDA system. HiDense PDA system permits accurate measurements in spray with extremely high particle concentrations, and it is the only PDA system available that provide high quality measurements in the core region of the spray cone. The spray close to the nozzle has been investigated. Also the spray at the center axis far from the nozzle has been investigated at different injection pressure. PDA data have been processed by using a time-dividing method which divides the spray information into four distinct periods (F, C, R and T). As a result it was found that large particles ∼ (85 μm) which are injected at high speed ∼ (90 m/s) in the earliest stage lose their velocity rapidly due to breakup into smaller droplets and are overtaken by smaller but slower particles which are emitted during a later stage. The results also show that within the measured range the effect of injection pressure on droplet size was rather small.

Original languageEnglish
Pages445-452
Number of pages8
Publication statusPublished - Dec 1 2008
Event7th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2008 - Sapporo, Japan
Duration: Jul 28 2008Jul 31 2008

Other

Other7th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2008
CountryJapan
CitySapporo
Period7/28/087/31/08

Keywords

  • DISI engine
  • Multi-hole injector
  • Phase Doppler anemometer
  • Spray
  • Time dividing method

ASJC Scopus subject areas

  • Automotive Engineering
  • Control and Systems Engineering
  • Modelling and Simulation

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  • Cite this

    Ahmed, F., Kawahara, N., Tomita, E., & Sumida, M. (2008). Spray behavior near the nozzle of a DISI Multi-hole injector using phase doppler anemometer. 445-452. Paper presented at 7th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2008, Sapporo, Japan.