Flamelet behavior in a turbulent diffusion flame measured by rayleigh scattering image velocimetry

Komiyama, Masaharu; Miyafuji, Akira; Takagi, Toshimi

doi:10.1016/s0082-0784(96)80234-7

Cited by 14 publications

(4 citation statements)

References 16 publications

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“…This approach, namely optical-flow velocimetry (OFV) or image correlation velocimetry (ICV), has been ultilized to track scalar fields with variable intensity, e.g. flame emission or stripped-off droplets from a liquid core [22][23][24][25][26]. The PIV software (Davis 8, LaVision) was used to compute the interfacial velocity by applying the cross-correlation to the fluorescent intensities of the OC images.…”

Section: Experiments Set-up and Methodologymentioning

confidence: 99%

Combined Optical Connectivity and Optical Flow Velocimetry for interfacial characterisation of liquid atomisation

Wang¹,

Hardalupas²

2021

ICLASS

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The Optical connectivity (OC) technique introduces a laser beam through an atomiser nozzle and relies on total internal reflection at the liquid interface to propagate inside the continuous liquid to study the instantaneous characteristics of the disintegrating continuous liquid and its interface during the primary atomisation through imaging the emitted fluorescent intensity from the liquid flow. In the current study, time-dependent OC is used to capture the temporal evolution of the liquid interface structures along the continuous liquid jet injected by a pressure jet atomiser into quiescent air at conditions leading to breakup within the first and second wind induced regime. Optical Flow Velocimetry (OFV) is developed to measure the local velocity of the interfacial structures of the liquid jet. The results show that the liquid interface accelerates downstream of the nozzle exit. The axial and radial mean and standard deviation of the fluctuations of the velocity of the interfacial structures are quantified. The results demonstrate the significance of liquid viscosity and liquid shear on atomisation.

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Section: Experiments Set-up and Methodologymentioning

confidence: 99%

Combined Optical Connectivity and Optical Flow Velocimetry for interfacial characterisation of liquid atomisation

Wang¹,

Hardalupas²

2021

ICLASS

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“…In particular, simultaneous imaging of Rayleigh scattering is impossible, making temperature and mixture fraction measurements difficult. A number of "non-particle" velocimetry approaches have been applied in turbulent flows, though few have found broad applicability under reacting conditions [15][16][17].…”

Section: Optical Flow Velocimetry (Ofv)mentioning

confidence: 99%

Two- and Three-Dimensional Measurements in Turbulent Nonpremixed Flames

Long¹

2000

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“…The image-correlation velocimetry technique of Tokumaru and Dimotakis 8 provides a framework for measuring the displacement fields of fluid motions. Extension of this approach to reacting flows appears to be feasible, 10,11 provided that appropriate scalars are imaged and the algorithms are validated experimentally. The scalar imaging velocimetry approach of Dahm et al 12 produces a velocity field by the inversion of the scalar transport equation-an approach that has been applied to large Schmidt number flows-but four-dimensional data sets are required.…”

Section: Introductionmentioning

confidence: 99%

“…The second OF algorithm employed was developed by Komiyama et al 10 and is applied to both scalar and particle images for velocimetry purposes. This technique differs from F-OF with respect to the control strategy, and cross-correlation surfaces are computed for the full-resolution image within a specified search window.…”

Section: Introductionmentioning

confidence: 99%

Systematic errors in optical-flow velocimetry for turbulent flows and flames

et al. 2001

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Optical-flow ͑OF͒ velocimetry is based on extracting velocity information from two-dimensional scalar images and represents an unseeded alternative to particle-image velocimetry in turbulent flows. The performance of the technique is examined by direct comparison with simultaneous particle-image velocimetry in both an isothermal turbulent flow and a turbulent flame by use of acetone-OH laser-induced fluorescence. Two representative region-based correlation OF algorithms are applied to assess the general accuracy of the technique. Systematic discrepancies between particle-imaging velocimetry and OF velocimetry are identified with increasing distance from the center line, indicating potential limitations of the current OF techniques. Directional errors are present at all radial positions, with differences in excess of 10°being typical. An experimental measurement setup is described that allows the simultaneous measurement of Mie scattering from seed particles and laser-induced fluorescence on the same CCD camera at two distinct times for validation studies.

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Flamelet behavior in a turbulent diffusion flame measured by rayleigh scattering image velocimetry

Cited by 14 publications

References 16 publications

Combined Optical Connectivity and Optical Flow Velocimetry for interfacial characterisation of liquid atomisation

Combined Optical Connectivity and Optical Flow Velocimetry for interfacial characterisation of liquid atomisation

Two- and Three-Dimensional Measurements in Turbulent Nonpremixed Flames

Systematic errors in optical-flow velocimetry for turbulent flows and flames

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