Effects of a directed co-flow on a non-reactive turbulent jet with variable density

Imine, Bachir; Saber-Bendhina, A.; Imine, Omar; Gazzah, Mohamed Hichem

doi:10.1007/s00231-005-0661-6

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…The numerical profile of temperature and species agree well with the experimental data presented by them. Imine et al [34] numerically investigated the influence of a directed co-flow on a non-restive turbulent axisymmetric jet using variable density. Their results indicated that the directed co-flow with a positive angle considerably enhanced the mixing.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Swirling Diffusion Flame Provided by a Coaxial Burner: Effect of Inlet Velocity Ratio

Chakchak

Hidouri

Zaidaoui

et al. 2021

Fluids

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This paper reports an experimental and numerical investigation of a methane-air diffusion flame stabilized over a swirler coaxial burner. The burner configuration consists of two tubes with a swirler placed in the annular part. The passage of the oxidant is ensured by the annular tube; however, the fuel is injected by the central jet through eight holes across the oxidizer flow. The experiments were conducted in a combustion chamber of 25 kW power and 48 × 48 × 100 cm3 dimensions. Numerical flow fields were compared with stereoscopic particle image velocimetry (stereo-PIV) fields for non-reacting and reacting cases. The turbulence was captured using the Reynolds averaged Navier-Stokes (RANS) approach, associated with the eddy dissipation combustion model (EDM) to resolve the turbulence/chemistry interaction. The simulations were performed using the Fluent CFD (Computational Fluid Dynamic) code. Comparison of the computed results and the experimental data showed that the RANS results were capable of predicting the swirling flow. The effect of the inlet velocity ratio on dynamic flow behavior, temperature distribution, species mass fraction and the pollutant emission were numerically studied. The results showed that the radial injection of fuel induces a partial premixing between reactants, which affects the flame behavior, in particular the flame stabilization. The increase in the velocity ratio (Rv) improves the turbulence and subsequently ameliorates the mixing. CO emissions caused by the temperature variation are also decreased due to the improvement of the inlet velocity ratio.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Swirling Diffusion Flame Provided by a Coaxial Burner: Effect of Inlet Velocity Ratio

Chakchak

Hidouri

Zaidaoui

et al. 2021

Fluids

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“…The effect of the density variation in the turbulent round free jet has been investigated experimentally and numerically by several authors like [1][2][3][4][5][6]. The results of these works show that the mean and turbulent quantities are strong functions of density ratio.…”

Section: Introductionmentioning

confidence: 99%

The dynamic field in turbulent round jet discharging into a co-flowing stream

Gazzah¹,

Boughattas²,

Belmabrouk³

et al. 2010

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The effects of a co-flow on a spreading and entrainment rate of turbulent round jets have been studied numerically. The first and second order closure models are used and have been compared with existing experimental data. The influence of theses models on the dynamic fields is examined. The results of the models in general agree well with the trends observed experimenttally. The co-flowing imposed noticeable restrictions on the spreading and the turbulent mixing. Finally, an entrainment hypothesis has been introduced to describe the development of turbulent jets issuing into a stagnant or co-flowing air. It relates the mass flow rate of the surrounding fluid entrained into the jet to the characteristic velocity difference between the jet and the co-flow. It is obvious that the co-flow decreases considerably the entrainment of air.

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Prediction of Droplet Velocities and Rain Out in Horizontal Isothermal Free Jet Flows of Air and Viscous Liquid in Stagnant Ambient Air

Rabadi

Friedel

Surma³

2007

Chem Eng & Technol

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Two-dimensional phase Doppler anemometer measurements of droplet size and velocity conducted under several nozzle conditions and a systematic variation of the air mass flow quality and liquid phase viscosity show that the air entrainment process is enhanced when keeping all test conditions constant except for increasing the Newtonian liquid viscosity above of that of water. A two-zone entrainment model based on a variable two-phase entrainment coefficient is proposed with the normalized axial distance allowing for a change in the jet angle. Thus, the jet perimeter is lower and the breakup length is longer in the case of air/relatively higher viscosity liquid phase. It provides the most accurate reproduction of the experimental droplet velocity in comparison with that of other models in the literature and, hence, is recommended for the prediction of the droplet velocity in the case of two-phase air/liquid phase free jet flow in stagnant ambient air. A model for predicting the droplet rain out, considering the droplet trajectories in the free jet flow, allows also for an adequate reproduction of the experimental data.

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Effects of a directed co-flow on a non-reactive turbulent jet with variable density

Cited by 11 publications

References 17 publications

Experimental and Numerical Study of Swirling Diffusion Flame Provided by a Coaxial Burner: Effect of Inlet Velocity Ratio

Experimental and Numerical Study of Swirling Diffusion Flame Provided by a Coaxial Burner: Effect of Inlet Velocity Ratio

The dynamic field in turbulent round jet discharging into a co-flowing stream

Prediction of Droplet Velocities and Rain Out in Horizontal Isothermal Free Jet Flows of Air and Viscous Liquid in Stagnant Ambient Air

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