An Investigation on Flame Shape and Size for a High-Pressure Turbulent Non-Premixed Swirl Combustion

Xi, Zhongya; Fu, Zhongguang; Hu, Xiaotian; Sabir, Syed Waqas; Jiang, Yibo

doi:10.3390/en11040930

Cited by 21 publications

(12 citation statements)

References 28 publications

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“…Similar to the results obtained by Tang et al, 22 the increase in fuel velocity leads to an increasing tendency in flame length and temperature distribution shown in Figures 2a and 4. Moreover, a similar phenomenon was observed in Xi’s experiments, 23 which investigated the effect of fuel mass flow rate on flame length. They attributed the increase in flame length to the enhancement of fuel axial and radial diffusion, which is in accordance with the increasing trend of turbulence kinetic energy as shown in Figure 2.…”

Section: Resultssupporting

confidence: 77%

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH₄/O₂ Combustor in a Copper Anode Furnace

et al. 2019

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With the rapid depletion of high-yield copper mineral resources and the accumulation of secondary copper resources, the recycling of secondary copper is gaining popularity in the copper industry. A copper anode furnace, often used in copper recycling, usually relies on methane combustion to melt copper scraps. In this work, a computational fluid dynamics (CFD) model of pure oxy-methane combustion is established to investigate the combustion characteristics of the CH 4 /O 2 combustor in the copper anode furnace. The model is validated by comparing the simulation results with experimental measurements. The effects on flame length and temperature distribution are investigated under various fuel velocities, oxidizer velocities, and oxidizer temperatures. The results indicate that flame length and temperature distribution increase as the fuel velocity and oxidizer temperature increase, and decrease with the increase in oxidizer velocity. The flame length and temperature distribution always show an increasing trend with the increasing equivalence ratio. Based on the recycling capacity of the copper anode furnace, this validated CFD model can be used to optimize the operation parameters for controlling flame length and temperature distribution.

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Section: Resultssupporting

confidence: 77%

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH₄/O₂ Combustor in a Copper Anode Furnace

et al. 2019

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“…The fracture aperture was first used as the control condition to construct an indoor physical model, and head loss and velocity were observed to analyze the characteristics of the fluid in the single fissure. Following the verification of the computational fluid dynamics (CFD) model in simulation of characteristics of the fluid in the single fissure with parameters most used [24][25][26][27][28], the relationship between the shape of the fracture (corner θ) and head loss was studied using it.…”

Section: Experiments and Methodologymentioning

confidence: 99%

A Fast Calculation Model for Local Head Loss of Non-Darcian Flow in Flexural Crack

Liu

Mou

Song

et al. 2020

Water

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Local head loss caused by fracture intersection is often ignored because there has not been a simple method to calculate it until now. Relevant research shows that neglecting the local flow resistance leads to inaccurate results, especially when the velocity and cross angle are large. Therefore, it is necessary to find a portable method for calculation. Physical experiments of single fracture with different apertures (e = 0.77, 1.18, 1.97, 2.73 mm) were set up first to study the flow characteristics, showing obvious non-Darcian flow, which can be depicted by the Forchheimer equation when the flow velocity is sufficiently large. The computational fluid dynamics (CFD) software ANSYS FLUENT was used to build numeric simulation models. A good correlation between CFD simulation results and physical experiment results was found (Pearson's correlation coefficient > 0.99). Then, the CFD models of flexural crack with different angles from 30 • to 150 • were established to compute the pressure drop of flexural crack at different velocity. It was found that the local head loss of the flexural crack varied with the bending angle, and its coefficient was expressed by the deformation of the logistic equation. By using this model, as well as a frictional head loss equation fitted by Forchheimer equation, the head loss of crossed fissures with fixed fracture aperture could be easily calculated. Water 2020, 12, 232 2 of 15 applications, a quadratic equation (J = Av + Bv 2 ) and an exponential equation (J = Cv −m ) are used to under limited conditions [8-11]. The Forchheimer equation can express the characteristics of non-Darcian flow in fracture [12-15]: − ∇P = aQ + bQ 2 (1) where Q is volumetric flow velocity, a and b are model coefficients, and −∇P is the pressure gradient. The factors affecting the flow of fissure fluid are complex and include the shape of the fissure, degree of contact, roughness, fluid viscosity, and external pressure [16-19]. Liu et al. [20] studied the law of fluid movement in a fracture network and found that the coefficient (a, b) of the Forchheimer equation decreases with an increase in the fracture aperture, and the error in model fitting can be reduced by expressing the coefficients of the Forchheimer equation as a power equation of fracture aperture [14]. Olson et al. [21] studied the effect of the ratio of the fracture opening to its height on the flow pattern, and Shu et al. [22] studied the variation in head loss with the width of the fissure and the velocity of flow when water flows through L-shaped fissures. Li et al. [23] studied the correlation between the head loss of a fluid in cross fissures and the width as well as roughness of the fissures.This study proposes a portable calculation model where the aperture and the shape of flexural crack are considered to predict head loss directly. It is difficult to consider all factors when studying the characteristics of flow in fractures. In order to investigate the influence of each one, the synergistic effects of each condition need to be reduced, ...

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“…Nilai viskositas berpengaruh pada kemampuan atomisasi bahan bakar tersebut. Viskositas campuran biodiesel semakin tinggi dengan bertambahnya persentase biodiesel, begitu juga terhadap nilai kalor dan flash point bahan bakar tersebut [21].…”

Section: Pengaruh Campuran Bahan Bakar Terhadap Temperatur Api Hasil Pembakaranunclassified

Pengaruh Campuran Bahan Bakar Biodiesel WCO - Diesel terhadap Karakteristik Api Hasil Pembakaran Spray Difusi pada Concentric Jet Burner

Sukri

Sasongko

Widodo

2021

JRM

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Biofuels from waste cooking oil (WCO) represent a sizable opportunity not only in terms of energy production but also as a way for sustainable development despite their low yield, higher viscosity, lengthy production time and cost. Alternatively, biodiesel can be blended at an appropriate blending ratio with convention diesel oils. The biodiesel and its blends is proved to give better emission characteristics than conventional diesel oils. This study aims to experimentally investigate the effect of the fuel blend on the combustion characteristics of WCO biodiesel. The characteristic are the droplet size, flame height, flame width and temperature distribution. In this study, the blended fuel are B0 (Solar), B10, B20, B30, B40 and B100 (WCO biodiesel). Measurement and visualization of the combustion flame for each variation of the fuel mixture was were tested at different pressures, namely 4 bar and 5 bar. The experimental results show that the droplet size increases with increasing WCO concentration in the fuel; on the other hand, visualization and calculations show that the height and width of the flame of the fuel mixture decreases Observation on the temperature distribution shows that the WCO biodiesel mixture has the potential to increase the fire temperature at certain points

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An Investigation on Flame Shape and Size for a High-Pressure Turbulent Non-Premixed Swirl Combustion

Cited by 21 publications

References 28 publications

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH₄/O₂ Combustor in a Copper Anode Furnace

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH₄/O₂ Combustor in a Copper Anode Furnace

A Fast Calculation Model for Local Head Loss of Non-Darcian Flow in Flexural Crack

Pengaruh Campuran Bahan Bakar Biodiesel WCO - Diesel terhadap Karakteristik Api Hasil Pembakaran Spray Difusi pada Concentric Jet Burner

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An Investigation on Flame Shape and Size for a High-Pressure Turbulent Non-Premixed Swirl Combustion

Cited by 21 publications

References 28 publications

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH4/O2 Combustor in a Copper Anode Furnace

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH4/O2 Combustor in a Copper Anode Furnace

A Fast Calculation Model for Local Head Loss of Non-Darcian Flow in Flexural Crack

Pengaruh Campuran Bahan Bakar Biodiesel WCO - Diesel terhadap Karakteristik Api Hasil Pembakaran Spray Difusi pada Concentric Jet Burner

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Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH₄/O₂ Combustor in a Copper Anode Furnace

Computational Fluid Dynamics Modeling of Combustion Characteristics of a CH₄/O₂ Combustor in a Copper Anode Furnace