Numerical Study of Interactions of Hydrodynamics, Kinetics and Radiation in Flames PDF Download
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Author: Rohit J. Nagarkar
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
The purpose of this thesis is to simulate flame spread in zero gravity and identify different factors that can impact the flame spread rate. This was possible using the CFD code written in FORTRAN developed by Bhattacharjee. The fuel studied in this thesis is Poly (methyl methacrylate) (PMMA). A mathematical model that shows how spread rate is being calculated is explained. The importance of grids used in CFD was shown by choosing appropriate number of grids for a given domain and a rule for choosing the domain was established. Impact of boundary layer or flow development distance was deeply understood and a formula for flame tip velocity or equivalent velocity was developed. Computational spread rate was then non-dimensionalized by dividing it with spread rate obtained from de- Ris formulae and plotted against Damkohler number which was calculated based on opposed flow velocity and equivalent velocity. A large variation of opposed flow for different fuel thicknesses was plotted against spread rate to show how fuel-half thickness affects the spread rate and the impact of radiation was understood. A critical fuel-thickness up to which flame existed in a quiescent microgravity was computed using this flame code. The impact of oxygen level was also studied in detail for a given fuel thickness. Pressure was varied in the microgravity regime to see its impact on flame spread rate.
Author: Rohit J. Nagarkar
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
The purpose of this thesis is to simulate flame spread in zero gravity and identify different factors that can impact the flame spread rate. This was possible using the CFD code written in FORTRAN developed by Bhattacharjee. The fuel studied in this thesis is Poly (methyl methacrylate) (PMMA). A mathematical model that shows how spread rate is being calculated is explained. The importance of grids used in CFD was shown by choosing appropriate number of grids for a given domain and a rule for choosing the domain was established. Impact of boundary layer or flow development distance was deeply understood and a formula for flame tip velocity or equivalent velocity was developed. Computational spread rate was then non-dimensionalized by dividing it with spread rate obtained from de- Ris formulae and plotted against Damkohler number which was calculated based on opposed flow velocity and equivalent velocity. A large variation of opposed flow for different fuel thicknesses was plotted against spread rate to show how fuel-half thickness affects the spread rate and the impact of radiation was understood. A critical fuel-thickness up to which flame existed in a quiescent microgravity was computed using this flame code. The impact of oxygen level was also studied in detail for a given fuel thickness. Pressure was varied in the microgravity regime to see its impact on flame spread rate.
Author: Bart Merci
Publisher: CRC Press
ISBN: 1000755967
Category : Technology & Engineering
Languages : en
Pages : 355
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Book Description
- written by world leading experts in the field - contains many worked-out examples, taken from daily life fire related practical problems - covers the entire range from basics up to state-of-the-art computer simulations of fire and smoke related fluid mechanics aspects, including the effect of water - provides extensive treatment of the interaction of water sprays with a fire-driven flow - contains a chapter on CFD (Computational Fluid Dynamics), the increasingly popular calculation method in the field of fire safety science
Author: T. O. Mohieldin
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Oghenekevwe Owin Onokpe
Publisher:
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Category :
Languages : en
Pages :
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Category : Aeronautics
Languages : en
Pages : 702
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Author:
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ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 630
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Author: Thomas Steinbacher
Publisher:
ISBN: 9783843943178
Category :
Languages : en
Pages :
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Author: H. C. Soong
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Daria Burot
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The simulation of fire scenarios requires the numerical modeling of various complex process, particularly the gaseous combustion of hydrocarbons including soot production and radiative transfers in a turbulent. The turbulent nature of the flow induces interactions between these processes that need to be taken accurately into account. The purpose of this thesis is to implement a transported Probability Density function method to model these interactions precisely. In conjunction with the flamelet model, the Lindstedt model, and a wide-band correlated-k model, the composition joint-PDF transport equation is solved using the Stochastic Eulerian Fields method. The model is validated by simulating 12 turbulent jet flames covering a large range of Reynolds numbers and fuel sooting propensity. Model prediction are found to be in reasonable agreement with experimental data. Second, the effects of turbulence-radiation interactions (TRI) on soot emission are studied in details, showing that TRI tends to increase soot radiative emission due to temperature fluctuations, but that this increase is smaller for higher Reynolds numbers and higher soot loads. This is due to the negative correlation between soot absorption coefficient and the Planck function. Finally, the effects of taking into account the correlation between mixture fraction and enthalpy defect on flame structure and radiative characteristics are also studied on an ethylene flame, showing that it has weak effect on the mean flame structure but tends to inhibit both temperature fluctuations and radiative loss.
Author: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 1162
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