The influence of airflow on fuel spray characteristics from a slit injectors

S. Moon, Choongsik Bae, Jaejonn Choi, Essam Abo-Serie

Research output: Contribution to journalArticle

Abstract

Optimization of fuel spray, airflow, and their interaction with the cylinder and piston wall is crucial to achieve stable combustion of stratified charge with minimum emissions in direct-injection spark-ignition (DISI) engines. In this study, the interaction between air and fuel spray from slit injector was investigated in a steady airflow system generated by a wind tunnel under atmospheric conditions. Both Mie scattering images and phase Doppler anemometry (PDA) measurements of the spray were analyzed for different air velocities. Three-dimensional computational fluid dynamics (3-D CFD) have been employed to further explain the mutual interaction between air and spray. It was found that increasing the airflow velocity across the spray results in a significant change in the bottom part of the spray while a slight change was observed close to the nozzle exit. The variation in spray geometry, which is mainly attributed to an aerodynamic effect and to extracted droplets from the main spray by the airflow effect, was evaluated and presented for different air velocities. The spray droplet size redistribution within the spray plume was investigated, and regions with smaller and larger droplets were identified and discussed. The results indicate that the effect of airflow pattern on droplet size distribution within the spray is a considerable factor in the optimization of airflow and spray together. This could be considered in achieving a limited ignitable region without much diffusion of smaller droplets to the non burning zone during the part load operation of DISI engines.
Original languageEnglish
Pages (from-to)400-409
Number of pages10
JournalFuel
Volume86
Issue number3
Early online date5 Sep 2006
Publication statusPublished - Feb 2007

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Direct injection
Air
Internal combustion engines
Computational fluid dynamics
Engine cylinders
Pistons
Wind tunnels
Nozzles
Aerodynamics
Scattering
Geometry

Keywords

  • Air-spray interaction
  • Slit Injector
  • CFD spray simulation
  • Experiement Slit Spray
  • DISI (Direct-injection spark-ignition)
  • Airflow

Cite this

The influence of airflow on fuel spray characteristics from a slit injectors. / Moon, S.; Bae, Choongsik; Choi, Jaejonn; Abo-Serie, Essam.

In: Fuel, Vol. 86, No. 3, 02.2007, p. 400-409.

Research output: Contribution to journalArticle

Moon, S, Bae, C, Choi, J & Abo-Serie, E 2007, 'The influence of airflow on fuel spray characteristics from a slit injectors' Fuel, vol. 86, no. 3, pp. 400-409.
Moon, S. ; Bae, Choongsik ; Choi, Jaejonn ; Abo-Serie, Essam. / The influence of airflow on fuel spray characteristics from a slit injectors. In: Fuel. 2007 ; Vol. 86, No. 3. pp. 400-409.
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N2 - Optimization of fuel spray, airflow, and their interaction with the cylinder and piston wall is crucial to achieve stable combustion of stratified charge with minimum emissions in direct-injection spark-ignition (DISI) engines. In this study, the interaction between air and fuel spray from slit injector was investigated in a steady airflow system generated by a wind tunnel under atmospheric conditions. Both Mie scattering images and phase Doppler anemometry (PDA) measurements of the spray were analyzed for different air velocities. Three-dimensional computational fluid dynamics (3-D CFD) have been employed to further explain the mutual interaction between air and spray. It was found that increasing the airflow velocity across the spray results in a significant change in the bottom part of the spray while a slight change was observed close to the nozzle exit. The variation in spray geometry, which is mainly attributed to an aerodynamic effect and to extracted droplets from the main spray by the airflow effect, was evaluated and presented for different air velocities. The spray droplet size redistribution within the spray plume was investigated, and regions with smaller and larger droplets were identified and discussed. The results indicate that the effect of airflow pattern on droplet size distribution within the spray is a considerable factor in the optimization of airflow and spray together. This could be considered in achieving a limited ignitable region without much diffusion of smaller droplets to the non burning zone during the part load operation of DISI engines.

AB - Optimization of fuel spray, airflow, and their interaction with the cylinder and piston wall is crucial to achieve stable combustion of stratified charge with minimum emissions in direct-injection spark-ignition (DISI) engines. In this study, the interaction between air and fuel spray from slit injector was investigated in a steady airflow system generated by a wind tunnel under atmospheric conditions. Both Mie scattering images and phase Doppler anemometry (PDA) measurements of the spray were analyzed for different air velocities. Three-dimensional computational fluid dynamics (3-D CFD) have been employed to further explain the mutual interaction between air and spray. It was found that increasing the airflow velocity across the spray results in a significant change in the bottom part of the spray while a slight change was observed close to the nozzle exit. The variation in spray geometry, which is mainly attributed to an aerodynamic effect and to extracted droplets from the main spray by the airflow effect, was evaluated and presented for different air velocities. The spray droplet size redistribution within the spray plume was investigated, and regions with smaller and larger droplets were identified and discussed. The results indicate that the effect of airflow pattern on droplet size distribution within the spray is a considerable factor in the optimization of airflow and spray together. This could be considered in achieving a limited ignitable region without much diffusion of smaller droplets to the non burning zone during the part load operation of DISI engines.

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