Droplet-size-classified stereoscopic PIV for spray characterization

Palero, Virginia; Ikeda, Yuji

doi:10.1088/0957-0233/13/7/312

Cited by 11 publications

(14 citation statements)

References 12 publications

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“…To investigate the droplet size and velocity distribution in the near nozzle region of the spray using HiDense PDA system, measurement points were selected at an interval of 0.5 mm in the radial direction and 2 mm in the axial direction. Size-classified technique was applied to obtain a detailed knowledge of the dynamics by distributing the droplets into several size classes [30][31][32][33][34]. The size-classified data analysis is one of the options to interpolate the physics of droplets.…”

Section: Resultsmentioning

confidence: 99%

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Ahmed

Kawahara

Tomita

et al. 2010

JTST

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The spray from a multi-hole injector applied to direct injection spark ignition (DISI) engine was investigated. In order to understand the detailed structure of the transient spray near the nozzle a combined LDA/PDA system was used. PDA system was optimized in order to detect relative smaller droplets. Size-classified technique was used to get deep information about the spray characterizations near nozzle. The experiments were performed at 7 MPa of injection pressure. At early stage of spray the droplet velocity distribution in the centre of the spray showed high value. Smaller droplets under 15 µm showing followability to air flow, while larger droplets over 20 µm will have drag due to momentum decay. Droplets of 15

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Section: Resultsmentioning

confidence: 99%

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Ahmed

Kawahara

Tomita

et al. 2010

JTST

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“…Unfortunately, when PIV is applied, it is not possible to know the velocity corresponding to particles with different sizes. PIV should be combined with another technique that allows size discrimin ation such as Multi-Intensity PIV (Palero and Ikeda, 2002).…”

Section: Resultsmentioning

confidence: 99%

3D imaging of evaporating fuel droplets by stereoscopic PIV

Palero

Ikeda

2002

J Vis

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A gun-type burner is a widely used oil burner for industrial and domestic applications. The oil is pressure-atomized and mixed with air generating a recirculating, swirling llow. Because of the surrounding llame, fuel droplets evaporate, being difficult to obtain information on droplets' dynamics. Several laser techniques have been applied to this burner for spray diagnosis. PDA provides information about droplet size and velocity but can say little about the instantaneous spatial structures in the llow. Planar laser techniques as PlY can describe the 2D instantaneous spatial structures, but cannot provide information about the 3D stmctures in the llow. Then Stereoscopic PlY was applied. This technique allows us to measure the full 3D velocity vector map in a whole lluid plane. This paper has a double purpose. Firstly, to visualize the 3D structures which are present in the burner, secondly, to show that Stereoscopic PlY is an applicable technique for the diagnosis of an evaporating spray.

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“…The vector plots of Ikeda et al [18] and contours of Palero et al [19] reveal disagreement between PIV and PDPA velocity measurement in this region. Palero and Ikeda [21] have also recorded discrepancy between StereoPIV and PDPA size classified velocity measurement at the near nozzle, high droplet number density region and suggested investigation of the discrepancy as future works. As a result, a clear understanding of the sources of error involved in the PIV measurement in dense regions of the spray is necessary to extend the measurement range to this area.…”

Section: Introductionmentioning

confidence: 96%

“…Ikeda et al [20] developed a new PIV data processing algorithm, introduced as multi-intensity-layer PIV, to also provide droplet size information. Palero and Ikeda [21] extended this processing algorithm to StereoPIV and investigated three dimensional velocity vector map of a spray field.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of StereoPIV Measurement of Droplet Velocity in an Effervescent Spray

Ghaemi

Rahimi

Nobes

2010

International Journal of Spray and Combustion Dynamics

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Particle image velocimetry (PIV) is a well known technique for measuring the instantaneous velocity field of flows. However, error may be introduced when measuring the velocity field of sprays using this technique when the spray droplets are used as the seed particles. In this study, the effect of droplet number density, droplet velocity profile, and droplet size distribution of a spray produced by an effervescent atomizer on velocity measurement using a StereoPIV has been investigated. A shadowgraph-particle tracking velocimetry (S-PTV) system provided measurement of droplet size and velocity for comparison. This investigation demonstrated that the StereoPIV under-estimates velocity at near-field dense spray region where measurement accuracy is limited by multi-scattering of the laser sheet. In the dilute far-field region of the spray, StereoPIV measurement is mostly in agreement with velocity of the droplet size-class which is close to the mean diameter based on droplet number frequency times droplet cross sectional area.

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Droplet-size-classified stereoscopic PIV for spray characterization

Cited by 11 publications

References 12 publications

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

3D imaging of evaporating fuel droplets by stereoscopic PIV

Evaluation of StereoPIV Measurement of Droplet Velocity in an Effervescent Spray

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