Four kinds of the two-equation turbulence model's research on flow field simulation performance of DPF's porous media and swirl-type regeneration burner

Fu, Jun; Tang, Yuan; Li, Jianxing; Ma, Yi; Wei, Chen; Li, Hong

doi:10.1016/j.applthermaleng.2015.09.116

Cited by 48 publications

(10 citation statements)

References 10 publications

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“…Four kinds of two equation turbulence models were compared in simulating DPF's porous media and swirl type regenerator burner. It was depicted back flow features of the Realizable k-ε are clearer than that of RNG k-ε model [23]. Ahmad Kan and Straatman proposed two equation turbulent model for investigation nonequilibrium heat transfer for unidirectional flow in porous media [24].…”

Section: Nomenclaturementioning

confidence: 97%

Numerical simulation of turbulent oscillating flow in porous media

Kardgar

Jafarian

2020

Scientia Iranica

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Two macroscopic turbulent models, P-dL and N-K, have been proposed in recent years for simulating turbulent unidirectional flow in porous media. In this paper a modification on N-K model has been proposed for turbulent oscillating flow in porous media. To this purpose, Turbulent oscillating flow in porous media has been simulated in microscale employing a periodic array. The k-ε model was applied to solve turbulent oscillating flow in periodic array. Control volume approach has been used to discretize Navier-Stokes and k-ε equations and the well-established SIMPLE method has been conducted to deal with pressure and velocity coupling. To modify N-K model the effect of different parameters such as frequency and Reynolds number has been investigated and the constants in source terms of turbulent kinetic energy and its dissipation rate has been modified versus Re according to microscale results. In order to validate the new modified constants, the modified N-K model was applied to turbulent oscillating flow in porous media and results were compared to original N-K macroscopic model.

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Section: Nomenclaturementioning

confidence: 97%

Numerical simulation of turbulent oscillating flow in porous media

Kardgar

Jafarian

2020

Scientia Iranica

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“…For the simulation of swirl flow in the flow field of swirl burner is complicated, and based on the previous study , the RNG k‐ɛ turbulence model which can describe the transient flow and curved flow well was selected to calculate the flow filed of the swirl burner.…”

Section: Computational Fluid Dynamics Simulationmentioning

confidence: 99%

“…By introducing the standard k ‐ ɛ , RNG k ‐ ɛ , realizable k ‐ ɛ, and SST k‐ω turbulence models, Fu et al . studied the prediction ability for flow field details in swirl burner for DPF regeneration with the characteristics of porous media flow and recirculation flow, whose research results can build good basis for understanding the influences the structure of swirl burner makes on flow field for DPF regeneration further, and found that it could improve the reproduction ability of the complex flow field details by suitable turbulence models, which can guide the design of swirl burner for DPF regeneration with reasonable geometry and fitting recirculation zone. Craft et al .…”

Section: Introductionmentioning

confidence: 99%

“…In that research, the simulation calculation was mainly used to study the characteristics of recirculation flow and similarly predicts the recirculation zone length and other characteristic parameters with appropriate turbulence models, therefore the above researches have great significances for swirl burner on studying the characteristics of flow field in DPF regeneration. By introducing the standard k-E, RNG k-E, realizable k-E, and SST k-x turbulence models, Fu et al [16] studied the prediction ability for flow field details in swirl burner for DPF regeneration with the characteristics of porous media flow and recirculation flow, whose research results can build good basis for understanding the influences the structure of swirl burner makes on flow field for DPF regeneration further, and found that it could improve the reproduction ability of the complex flow field details by suitable turbulence models, which can guide the design of swirl burner for DPF regeneration with reasonable geometry and fitting recirculation zone. Craft et al [17] analyzed the challenges and prospects of the turbulence models applied in swirling flow in modern industry and environmental field, which have significances on solving the complex numerical simulation problems of seepage flow in porous media and swirl flow of DPF, and have certain guidance meaning to the key technologies and its reliability of swirl burner design by the numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

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Recirculation zone characteristics research on a sudden expansion swirl burner for DPF regeneration

Tang

et al. 2018

Env Prog and Sustain Energy

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Based on the autonomously designed sudden expansion swirl burner and combined with the characteristics of diesel particulate filter (DPF) regeneration, fitting geometric parameters and values were determined with the orthogonal experimental design method. And the effects of main geometric parameters such as the sudden expansion ratio, length‐diameter ratio and position of air supply pipe on main evaluation indexes of the recirculation zone characteristics were studied with CFD. Results showed that with the geometry of sudden expansion ratio 2.0 and length‐diameter ratio 2.1 and air supply pipe located in the middle of the combustion chamber, the length of the recirculation zone in the center could be increased greatly; in order to increase the reattachment length, the sudden expansion ratio should be 1.5–2.0 and the length–diameter ratio should be larger and the air supply pipe should be closer to the fuel spray nozzle; and the swirl intensity was mainly depended on the length–diameter ratio, which could be effectively enhanced when the length–diameter ratio ranged from 2.1 to 2.4. It provides beneficial references for the research of complex flow field in sudden expansion swirl burner and porous medium. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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“…k−ε RNG is recognized as a model which shows reasonable behavior for swirling flows which presents more accurate results compared to standard k−ε [47]. k−ω SST provides good accuracy in adverse pressure gradients [48], and gives satisfactory results in the simulation of swirling flows [49,50,51].…”

mentioning

confidence: 99%

A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

Vakilipour

Tohidi

Al-Zaili

et al. 2019

Appl. Math. Mech.-Engl. Ed.

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The turbulent combustion flow modeling are performed to study the impacts of CO 2 addition to the fuel and oxidizer streams on the thermochemical characteristics of a swirl stabilized diffusion flame SM1. A flamelet approach along with three well-known turbulence models are utilized to model the turbulent combustion flow field. The k−ω SST shows the best agreement with the experimental fields compared to other methods. Then, the k−ω SST is employed to study the effects of CO 2 dilution on the flame structure and strength, temperature distribution, and CO concentration. To determine the chemical effects of CO 2 dilution, a fictitious species is replaced with the regular CO 2 in both fuel and oxidizer streams.The results indicate that the flame temperature is decreased when CO 2 is added to either fuel or oxidizer streams. The flame length reduction is observed at all levels of CO 2 dilution. The H radical concentration indicating the flame strength decreases following by the thermochemical effects of CO 2 dilution processes. In comparison with fictitious species dilution, chemical effects of CO 2 addition enhance CO mass fraction. The numerical simulations show that by increasing the

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Four kinds of the two-equation turbulence model's research on flow field simulation performance of DPF's porous media and swirl-type regeneration burner

Cited by 48 publications

References 10 publications

Numerical simulation of turbulent oscillating flow in porous media

Numerical simulation of turbulent oscillating flow in porous media

Recirculation zone characteristics research on a sudden expansion swirl burner for DPF regeneration

A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

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