Fractal and turbulence characteristics of aerodynamic fields of swirl burners

Li, Zhengqi; Jing, Jianping; Liu, Guangkui; Chen, Zhichao

doi:10.1016/j.ces.2009.09.081

Cited by 12 publications

(2 citation statements)

References 13 publications

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“…At a high swirl number (S ≥ 2.48), the recirculation flow structure exists and tends to increase the chemical conversion and the flame stability [8]. In line with the Nemoda results, Li et al [9] reveals that the turbulence intensity value influences the combustion process and the NOx formation in a burner [9].…”

Section: Turbulence Intensitysupporting

confidence: 63%

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

Budhi

Bindar

2017

MATEC Web Conf.

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Abstract. Swirl turbulent flow is intensively used by the industrial equipments such as combustion, separation and heat transfer equipments. The fluid dynamic characteristics of this flow are influenced by the chamber's geometries and the operating conditions. One of the important operating condition variables which greatly affects the fluid dynamic characteristics is initial tangential intensity (ITI) or often known as swirl number. This study is aimed to quantify the effect of the initial tangential intensity on the fluid dynamic characteristics in a tangential burner. The method of the study is based on the computational fluid dynamic simulation under the Ansys Fluent CFD engine. The fluid dynamic characteristics were modeled using the standard k-H turbulent model. The simulation results exhibited that the three dimensional flow structure in a tangential burner is dominated by the tangential flow. The fluid dynamic simulations also showed that the effect of the ITI on the mean turbulence intensity and the mean residence time begin to be significant at the ITI values ≥ 1.1 and ≥ 4.5 respectively, while at low ITI values, its effects on both variables are insignificant. The lowest pressure drop obtained in this study was found on the burner with ITI value of 3.2.

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Section: Turbulence Intensitysupporting

confidence: 63%

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

Budhi

Bindar

2017

MATEC Web Conf.

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“…As environmental problems escalate, there has been a general interest in decreasing the emissions of NO x from power plants burning coal and low-NO x combustion technologies have been developed (Li et al, 2003(Li et al, , 2010aAlessandro and Ana, 2009). Low-NO x burners are widely used in China and a low-NO x double swirl flow pulverized coal burner has been designed by Ishikawajima-Harima Heavy Industries Co., Ltd. in Japan.…”

Section: Introductionmentioning

confidence: 98%

Influence of the mass flow rate of secondary air on the gas/particle flow characteristics in the near-burner region of a double swirl flow burner

Jing

Lin

et al. 2011

Chemical Engineering Science

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Experimental investigation of vortex breakdown in a coaxial swirling jet with a density difference

Ahmad

Gotoda

2012

Chemical Engineering Science

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c We studied a stable vortex breakdown in a variable-property coaxial swirling jet. c A model using common nondimensional numbers is proposed to explain the following. c The height of the stagnation point increases with increasing outer jet velocity. c The height of the stagnation point is always lower for a denser inner jet. c The model is fairly successful in explaining the trends observed in our study. a r t i c l e i n f o t r a c tIn this work we experimentally investigate the behavior of stable vortex breakdown taking place in a coaxial swirling jet with a density difference, highlighting the effect of the outer jet on the height of the stagnation point. With increasing bulk flow velocity of the outer jet, the degree of flow divergence decreases, resulting in an increase in the height of the stagnation point. This is due to a significant increase in the mean axial velocity along the centerline of the jet, which is clearly shown by particle image velocimetry (PIV). We proposed an equation to physically explain the height of the stagnation point in a coaxial swirling jet with a density difference undergoing vortex breakdown, by considering an estimate of the momentum balance in the flow, based on a simplified Navier-Stokes equation for coaxial jets with coannular flow. Even though the effect of the density difference on the height of the stagnation point is overestimated by the proposed equation, the increase with respect to the Reynolds number of the outer jet observed experimentally is in reasonably good qualitative agreement with the trend predicted by the theoretical model.

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Fractal and turbulence characteristics of aerodynamic fields of swirl burners

Cited by 12 publications

References 13 publications

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

Influence of the mass flow rate of secondary air on the gas/particle flow characteristics in the near-burner region of a double swirl flow burner

Experimental investigation of vortex breakdown in a coaxial swirling jet with a density difference

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