Atmospheric low swirl burner flow characterization with stereo PIV

Legrand, Mathieu; Nogueira, J.; Lecuona, A.; Nauri, Sara; Rodríguez, Pedro

doi:10.1007/s00348-009-0775-6

Cited by 57 publications

(32 citation statements)

References 20 publications

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“…The color map shows an abrupt change in radial velocity, just when crossing from a quadrant to another. In some cases, the assessment of B does not only allow giving a confidence interval but also offer the opportunity of correcting the measurement, removing the readout bias (see Nogueira et al 2009;Legrand et al 2010 as measurement correction examples).…”

Section: Application To a High Swirl Jetmentioning

confidence: 99%

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Simultaneous assessment of peak-locking and CCD readout errors through a multiple Δt strategy

et al. 2011

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The multiple Dt strategy is an inexpensive procedure that can be implemented with any usual particle image velocimetry (PIV) set up. The only requirement is acquiring different series of PIV image pairs, setting a different time between laser pulses for each series. With this additional information, robust procedures for error assessment are possible. Within this strategy, this paper offers new discoveries that correct and complement previous works by the authors. Nogueira et al. (Meas Sci Technol 20-7:074001, 2009) addressed the tasks of assessing CCD readout and peak-locking bias errors separately. In this paper, a new approach, of general application to PIV, is proposed for assessing both errors simultaneously. Additionally, it unveils the effect of the flow variability on the local amplitude of the peak-locking bias. In a different work, Nogueira et al. (Exp Fluids. doi: 10.1007/s00348-011-1094-2, 2011) have focused on assessing peak-locking rms error. That paper achieved only order of magnitude estimations of the rms error because one of its components was overlooked. Here, the new term is included and the assessment obtained is good enough to correct rms systematic errors, improving the measurement of the turbulent kinetic energy or similar flow magnitudes. After describing the strategies, the application to selected synthetic and real cases is presented, validating the modeling of the errors behavior when dealing with turbulent flows. The results indicate the possibility to assess bias errors in the range from 0.01 to 0.2 pixels for both sources (peak locking and CCD readout) simultaneously. Furthermore, the previous works simply assessed the magnitude of the errors, but the results of the new procedures proposed here, in some cases, are good enough to correct the measurement itself. In addition, the determination of zones where these errors are not the dominant ones is presented.

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Section: Application To a High Swirl Jetmentioning

confidence: 99%

“…The flow and the measurement setup are detailed in Legrand et al (2010). The ensemble average of the measured velocity " V M;Dt is calculated with 250 PIV samples at each location and for each Dt.…”

Section: Application To a High Swirl Jetmentioning

confidence: 99%

Simultaneous assessment of peak-locking and CCD readout errors through a multiple Δt strategy

et al. 2011

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“…Double helices, induced by the core precession, were also detected by [16] in a Large Eddy Simulation (LES) of a strongly swirling flame with vortex breakdown. However, based on a Proper Orthogonal Decomposition (POD) of the instantaneous velocity fields, measured by Particle Image Velocimetry, [24] showed that helical vortices with a spatial structure similar to those detected by [12] were the most powerful in the isothermal swirling jet flow with vortex breakdown (S = 0.64, Re = 8,000), while they could not be detected in the reacting flow case ( was 2.0). [31] also reported that the vortex core precession could be detected only in an isothermal swirling jet flow (S = 0.75), but not in flames ( ≤ 1.0).…”

Section: Introductionmentioning

confidence: 97%

Flow Structure of Swirling Turbulent Propane Flames

Алексеенко

Дулин

Kozorezov

et al. 2011

Flow Turbulence Combust

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Flow structure of premixed propane-air swirling jet flames at various combustion regimes was studied experimentally by stereo PIV, CH* chemiluminescence imaging, and pressure probe. For the non-swirling conditions, a nonlinear feedback mechanism of the flame front interaction with ring-like vortices, developing in the jet shear layer, was found to play important role in the stabilisation of the premixed lifted flame. For the studied swirl rates (S = 0.41, 0.7, and 1.0) the determined domain of stable combustion can be divided into three main groups of flame types: attached flames, quasi-tubular flames, and lifted flames. These regimes were studied in details for the case of S = 1.0, and the difference in the flow structure of the vortex breakdown is described. For the quasi-tubular flames an increase of flow precessing above the recirculation zone was observed when increased the stoichiometric coefficient from 0.7 to 1.4. This precessing motion was supposed to be responsible for the observed increase of acoustic noise generation and could drive the transition from the quasi-tubular to the lifted flame regime.

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“…When the temperature of the combustion products T g reaches the value of about 1100 K, the atomizer fixed at a distance of 0.5 m from the upper face of the cylinder was switched. The specialized software (realizing the optical methods as PIV [6], PTV [7], Stereo PIV [8] or SP [9]) started on the PC, and the motion of the atomized flow of suspension was recorded by video (it was at the inlet and outlet from a cylindrical channel). Characteristic extinguishing time of typical flammable substances t e was the main parameter determined in experimentations.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Investigation of the Extinguishing Features for Liquid Fuels and Organic Flammable Liquids Atomized by a Water Flow

Voytkov

Забелин

Vysokomornaya

2016

EPJ Web of Conferences

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Abstract. The processes of heat and mass transfer were investigated experimentally while moving and evaporating the atomized water flow in high-temperature combustion products of typical liquid fuels and organic flammable liquids: gasoline, kerosene, acetone, crude oil, industrial alcohol. We determined typical periods of liquid extinguishing by an atomized water flow of various dispersability. Data of the discharge of extinguishing medium corresponding to various parameters of atomization and duration of using the atomization devices was presented. It is shown that U m ≈3.5 m/s is a minimal outflow velocity of droplets during moving while passing the distance of 1m in the hightemperature gas medium to stop the combustion of organic liquids.

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Atmospheric low swirl burner flow characterization with stereo PIV

Cited by 57 publications

References 20 publications

Simultaneous assessment of peak-locking and CCD readout errors through a multiple Δt strategy

Simultaneous assessment of peak-locking and CCD readout errors through a multiple Δt strategy

Flow Structure of Swirling Turbulent Propane Flames

Investigation of the Extinguishing Features for Liquid Fuels and Organic Flammable Liquids Atomized by a Water Flow

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