Structure of Confined Laminar Spray Diffusion Flames/numerical Investigation PDF Download
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Author: M. A. Mawid
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 42
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Book Description
Author: M. A. Mawid
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 42
Get Book Here
Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722810016
Category :
Languages : en
Pages : 30
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Book Description
The structure of confined laminar spray diffusion flames is investigated numerically by solving the gas-phase conservation equations for mass species, continuity, momentum, and energy and the liquid-phase equations for droplet position, velocity, size, and temperature. A one-step global reaction scheme along with six equilibrium reactions are employed to model the flame chemistry. Monodisperse as well as polydisperse sprays are considered. The numerical results demonstrate that liquid spray flames substantially differ from gaseous flames in their structure, i.e., temperature, concentration, and velocity fields, shape, and dimensions under the same conditions. Spray flames are predicted to be taller and narrower than their counterpart gaseous ones and their shapes are almost cylindrical. This is in agreement with experimental observations. The numerical computations also show that the use of the equilibrium reactions with the one-step reaction scheme decreases the flame temperature compared to the one-step reaction scheme without the equilibrium reactions and more importantly increases the surface area of the flame zone due to a phenomenon termed 'equilibrium broadening.' The spray flames also possess a finite thickness with minimal overlap of the fuel and oxygen species. A case for which a fuel-mixture consisting of 20 to 80 percent gas-liquid by mass is introduced into the combustor is also investigated and compared with predictions using only gaseous or liquid fuel. Mawid, M. A. and Bulzan, D. L. and Aggarwal, S. K. Glenn Research Center RTOP 505-62-21...
Author: M. A. Mawid
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 42
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722457822
Category :
Languages : en
Pages : 26
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Book Description
The structure and characteristics of gaseous confined laminar diffusion flames are investigated by numerically solving the time-dependent two-dimensional axisymmetric conservation equations. The numerical model accounts for the important chemical and physical processes involved, including axial diffusion, viscous effects, radial convection, and finite-rate chemistry. The numerical results clearly show that the flame has a finite thickness and leakage of fuel vapor into the flame zone is possible. The effect of heat release is found to induce some radial flow. Predicted flame shape and dimensions are compared to the classical Burke-Schumann flame. The numerically calculated flame is observed to be about 15 percent taller and 5 percent narrower than that of the Burke-Schumann solution under the same conditions. Mawid, M. A. and Bulzan, D. L. and Aggarwal, S. K. Glenn Research Center RTOP 505-62-21...
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
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Author: M. A. Mawid
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 28
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Author: Craig M. Miesse
Publisher:
ISBN:
Category :
Languages : en
Pages : 255
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This study was motivated by the proliferation of portable electronic devices and the limitations of battery technology to meet the escalating power demands of such devices. Several battery replacement technologies intended to tap the massive energy densities of liquid chemical fuels have been proposed, and many of these require the use of combustion for its rapid and efficient conversion of chemical energy to heat. To enable such devices on smaller length scales, engineering challenges to microscale combustion must be solved. Presented herein are advances in the design and performance of microscale hydrocarbon combustion devices and fundamental studies of microscale flame structure. A simple, robust, high endurance, high efficiency sub-millimeter hydrocarbon microscale combustor capable of producing an estimated 400W-cm-3 was built by reducing heterogeneous reactions in the combustor, tailoring the flow pattern of the fuel and oxidizer, and properly insulating the combustor to limit heat loss. A four-step surface treatment scheme was developed to mitigate radical quenching on poly-crystalline alpha-alumina surfaces. A laminar diffusion flame structure consisting of a column of cellular edge flames aligned in the direction of flow was discovered and is believed to be novel to the microscale. Characterization of the dynamics of this flame structure showed that the structure was heavily influenced by fuel and oxidant composition and transport properties. The cellular structure was determined to arise via a mass transfer-limited mechanism. The structure, intensity, and spacing of the flame cells were also shown to be highly sensitive to heat transfer effects. The developed burner and fundamental discoveries on microscale flame structure are important developments in the microscale power generation field.
Author: D. P. S. Abam
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: Mark Alexander Mikofski
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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