Development behavior of vaporizing sprays from a high-pressure swirl injector using exciplex fluorescence method

Choi, Dong Seok; Kim, Duck Jool; Hwang, Soon Chul

doi:10.1007/bf03185068

Cited by 9 publications

(2 citation statements)

References 8 publications

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“…Wicker et al [4] found that the higher injection pressure caused a longer spray tip penetration and wider spray angle from the understanding of the instantaneous and transient GDI spray structure and evolution by the digital particle image velocimetry. Choi et al [5] studied the spray structure of a vaporizing GDI spray using the Exciplex Fluorescence method. They found that the ambient pressure had a significant effect on the axial growth of the spray, while the ambient temperature had a great influence on the radial growth.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on hollow-cone fuel spray of highpressure swirl injector under high ambient pressure condition

2008

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A hybrid breakup model was proposed as a trustworthy prediction of hollow-cone fuel spray in the present study and the atomization process of the hollow-cone fuel spray of a high-pressure swirl injector in a Gasoline Direct Injection (GDI) engine under high ambient pressure conditions was studied by a new hybrid breakup model. The proposed hybrid breakup model is composed of the Linearized Instability Sheet Atomization (LISA) model as a primary breakup process. The Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model, instead of the Taylor Analogy Breakup (TAB) model, was used as a secondary breakup process. The effects of the droplet deformation on a droplet aerodynamic external force are considered in the APTAB model. In addition, we replaced the 2x distribution function used in previous the APTAB model by the Rosin-Rammler distribution function to improve the prediction precision. The Laser Induced Exciplex Fluorescence (LIEF) technique and the Phase Doppler Anemometry (PDA) system were used to produce a set of experimental data for the model validation. The estimation of the prediction ability of the LISA+APTAB model was carried out, and spray characteristics, which are difficult to obtain by experimental method, were calculated and discussed. The suggested hybrid breakup model showed better prediction capability compared with the previous model (LISA+TAB model). From the calculated results, the effect of the ambient pressure on the SMD (Sauter Mean Diameter) and droplet velocity could be discussed quantitatively.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on hollow-cone fuel spray of highpressure swirl injector under high ambient pressure condition

2008

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“…This was discovered from an understanding of the instantaneous and transient structure of the hollowcone fuel spray and evolution by digital particle image velocimetry. Choi et al [5] measured the spray structure of a vaporizing spray using the exciplex fluorescence method. They found that the ambient pressure has a significant effect on the axial growth of the spray, while the ambient temperature has a great influence on the radial growth.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a new hybrid break-up model for the modelling of hollow-cone fuel spray

Shim

Choi

Kim

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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In the present study, a numerical study and an experimental study on the break-up process of a hollow-cone fuel spray were performed. This was done to develop a new hybrid break-up model and to validate this model under various ambient pressure conditions. The new hybrid break-up model was composed of the linearized instability sheet atomization (LISA) model for the primary break-up and the aerodynamically progressed Taylor analogy break-up (APTAB) model, with consideration for the deformed droplet shape, for the secondary break-up. The APTAB model was used instead of the Taylor analogy break-up (TAB) model used in the previous hybrid break-up model (the LISA-TAB model). The hybrid break-up models were implemented in modified KIVA code. The calculated results of the spray characteristics, such as the spray tip penetration, spray width, Sauter mean diameter, and droplet velocity, by means of the LISA-APTAB model were compared with the calculated results via the LISA-TAB model and the experimental results found with the laser-induced exciplex fluorescence technique and the phase Doppler anemometry (PDA) system. The calculations and the experiment were performed under ambient pressures of 0.1 MPa and 0.5 MPa and an ambient temperature of 293 K. It was found that the calculated results from the LISA-APTAB model showed good agreement with the experimental results. The discrepancies between the calculated results and the experimental results in spray characteristics were reduced by a considerable margin by adopting the APTAB model instead of the TAB model for the secondary break-up process.

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Spray structures and vaporizing characteristics of a GDI fuel spray

Choi

Kim

2002

KSME International Journal

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Development behavior of vaporizing sprays from a high-pressure swirl injector using exciplex fluorescence method

Cited by 9 publications

References 8 publications

Numerical and experimental study on hollow-cone fuel spray of highpressure swirl injector under high ambient pressure condition

Numerical and experimental study on hollow-cone fuel spray of highpressure swirl injector under high ambient pressure condition

Development and validation of a new hybrid break-up model for the modelling of hollow-cone fuel spray

Spray structures and vaporizing characteristics of a GDI fuel spray

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