Numerical and experimental study of a jet in a crossflow for different velocity ratio

Kalifa, Rim Ben; Habli, Sabra; Saïd, Nejla Mahjoub; Bournot, Hervé; Palec, Georges Le

doi:10.1007/s40430-014-0129-z

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…Comparisons with the data of Kalifa et al, 2014 reveal that some discrepancies are occurred from y/D=0.0 to y/D=2.0. It is believed that this is due to the strong interactions between the crossflow and the jet flow because this is the region (x/D=-1.0-2.4) where two flows encounter to each other.…”

Section: Validationmentioning

confidence: 78%

Dominant Vortex Structures in Transverse Jets

Bayraktar

Yılmaz

2016

JAFM

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In this paper, formation and development of one of the most dominant vortex structures, namely, counterrotating vortex pair (CVP) which is seen in the jet in crossflow are investigated numerically. Influences of the inclination angles between the nozzle(s) and channel on the CVP are presented for three inclination angles, =30, 60 and 90 at velocity ratio, R=2.0. Effects of the number of the nozzles on the evolution of CVP is analyzed by considering the single and three side-by-side positioned circular nozzles. In addition to the CVP, some secondary vortices are also reported by considered relatively a narrow channel because their existence cannot be showed in wider channel. Simulations reveal that higher the inclination angle the more jet penetration into the channel in all directions and increasing the inclination angle causes larger CVPs in size. Although the flow structure of the CVP formed in the single and three side-by-side nozzles are similar their evolution is quite different.

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Section: Validationmentioning

confidence: 78%

Dominant Vortex Structures in Transverse Jets

Bayraktar

Yılmaz

2016

JAFM

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“…The jet was subjected to an external flow at rest or in uniform co-flow of velocity u ∞ . The velocity profiles of the co-flow were established by a hot wire anemometry (Ben Kalifa, Habli, Mahjoub Saïd, Bournot, & Le Palec, 2014). The thickness of the boundary layer of the main flow was about 10 mm.…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical study of an offset jet with different velocity and offset ratios

Assoudi

Habli

Saïd

et al. 2015

Engineering Applications of Computational Fluid Mechanics

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The present study examines the configuration of an offset jet issuing into either a quiescent medium or a moving stream (co-flowing). The mean velocity and turbulence characteristics of the turbulent offset jet have been investigated using a particle image velocimetry technique at three velocity ratios and for two offset ratios. A numerical simulation of a threedimensional offset jet has also been carried out by comparing the corresponding results with previous experimental data and our measurements. The numerical investigation was performed by means of the finite volume method together with a second-order turbulent closure model -the Reynolds stress model (RSM) -to examine the behavior of the flow for different velocity ratio and offset ratios. Results give a satisfactory agreement between the experimental data and the calculations. Data from the early flow region clearly show a significant influence of the velocity ratio and the offset ratio on the mean flow and turbulence characteristics.

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“…It is worth noting that K s needs to be assumed first to compute orifice diameter ( D ) by Eqs. (21) and (23) before checking through Fig. 6.…”

Section: Dimensions Of Jet Orificesmentioning

confidence: 99%

“…The assessment of the burner performance can be implemented experimentally by using one or several equipments combined, such as thermocouples [8,18], burst spectrum analyzer [8], non-intrusive laser-based measurement [19][20][21] and particle imaging velocimetry [21][22][23]. However, the experimental cycle is often prohibitively time consuming and costly for different burner specifications and types, and the measurement at high temperature (> 1000 K) is potentially dangerous for researchers.…”

Section: Introductionmentioning

confidence: 99%

Design optimization and CFD evaluation of a volute swirl burner with central gas supply

Jia

Tang

2020

J Braz. Soc. Mech. Sci. Eng.

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The reasonable design and optimization can be useful tools to solve issues in several industrial applications. Since it is timeconsuming and costly to do the experimental performance assessment using various equipments, computational fluid dynamics (CFD) with suitable models has been widely used due to the good agreement with experiments. This paper presented a universal design calculation method of a volute swirl burner with central gas supply. Then, CFD simulations with standard k-ε model, under non-reacting and reacting conditions, were carried out to verify the design feasibility. The mixedness of gas/air under non-reacting condition was evaluated from the perspective of normal distribution in statistics and checked by the designed excess air factor. A parametric study for various mixing section lengths and outlet diameters of the burner block was conducted to investigate their influence on the central recirculation zone and the temperature distribution. Simulation results show good agreement with empirical formula calculation. The gas and air have been mixed uniformly around the location that is 60 times of the gas orifice diameter. Additionally, an enlarged recirculation zone with increased recirculation strength can be formed with the increasing mixing length and block outlet diameter. In combustion simulation, the longer mixing length improves the flame stabilization but makes the combustion center move to the upstream of the burner due to the strengthened recirculation zone. The larger outlet diameter of the block stretches the flame and moves the high-temperature zone inside the flame to the downstream of the block wall.

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Numerical and experimental study of a jet in a crossflow for different velocity ratio

Cited by 7 publications

References 18 publications

Dominant Vortex Structures in Transverse Jets

Dominant Vortex Structures in Transverse Jets

Experimental and numerical study of an offset jet with different velocity and offset ratios

Design optimization and CFD evaluation of a volute swirl burner with central gas supply

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