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A numerical study of three-dimension...

Feier, Ioan I., Jr.

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A numerical study of three-dimensional flame propagation over thin solids in purely forced concurrent flow including gas-phase radiation.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A numerical study of three-dimensional flame propagation over thin solids in purely forced concurrent flow including gas-phase radiation./
Author:	Feier, Ioan I., Jr.
Description:	252 p.
Notes:	Adviser: James S. T'ien.
Contained By:	Dissertation Abstracts International68-03B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253685

A numerical study of three-dimensional flame propagation over thin solids in purely forced concurrent flow including gas-phase radiation.
Feier, Ioan I., Jr.

A numerical study of three-dimensional flame propagation over thin solids in purely forced concurrent flow including gas-phase radiation. - 252 p.

Adviser: James S. T'ien.

Thesis (Ph.D.)--Case Western Reserve University, 2007.

The effect of flame radiation on concurrent-flow flame spread over a thin solid sample of finite width in a low-speed wind tunnel is modeled using three-dimensional full Navier-Stokes equations and three-dimensional flame radiation transfer equations. The formulation includes the conservation of mass, momentum, energy, and species: fuel vapor, oxygen, carbon dioxide and water vapor. The SN discrete ordinates method is used to solve the radiation transfer equation with a mean absorption coefficient kappa = Ckappa p, where kappap is the Planck mean absorption coefficient of the gas mixture. The varying parameter C has a value between 0 and 1; C represents the strength of flame radiation. In addition, the solid fuel absorptivity alpha is varied to ascertain the effect of flame radiation heat feedback to the solid. The flow tunnel modeled has a dimension of 10x10x30 cm, the solid fuel has a width of 6-cm with two 1-cm inert strips as edges. Incoming forced flow velocity (5 cm/s) of 21% oxygen is assumed. For comparison with the three-dimensional results, corresponding two-dimensional computations are also performed.Subjects--Topical Terms:

1018395
Engineering, Aerospace.

A numerical study of three-dimensional flame propagation over thin solids in purely forced concurrent flow including gas-phase radiation.
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100 1 $a Feier, Ioan I., Jr. $3 1297937
245 1 2 $a A numerical study of three-dimensional flame propagation over thin solids in purely forced concurrent flow including gas-phase radiation.
300 $a 252 p.
500 $a Adviser: James S. T'ien.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1885.
502 $a Thesis (Ph.D.)--Case Western Reserve University, 2007.
520 $a The effect of flame radiation on concurrent-flow flame spread over a thin solid sample of finite width in a low-speed wind tunnel is modeled using three-dimensional full Navier-Stokes equations and three-dimensional flame radiation transfer equations. The formulation includes the conservation of mass, momentum, energy, and species: fuel vapor, oxygen, carbon dioxide and water vapor. The SN discrete ordinates method is used to solve the radiation transfer equation with a mean absorption coefficient kappa = Ckappa p, where kappap is the Planck mean absorption coefficient of the gas mixture. The varying parameter C has a value between 0 and 1; C represents the strength of flame radiation. In addition, the solid fuel absorptivity alpha is varied to ascertain the effect of flame radiation heat feedback to the solid. The flow tunnel modeled has a dimension of 10x10x30 cm, the solid fuel has a width of 6-cm with two 1-cm inert strips as edges. Incoming forced flow velocity (5 cm/s) of 21% oxygen is assumed. For comparison with the three-dimensional results, corresponding two-dimensional computations are also performed.
520 $a Detailed spatial flame profiles, solid surface profiles, and heat fluxes are presented. Increasing the flame radiation strength decreases the flame length. Although flame radiation provides an additional heat transfer mechanism to preheat the solid, it is insufficient to offset the decreased convective heating due to the shorter flame; the net effect is a slower spread rate. The percentage of unreacted fuel vapor that escapes from the flame is under 2%. It is theorized that some of the pyrolyzed fuel vapor diffuses sideway and reacts at the flame edges. A radiative energy balance is analyzed also.
520 $a Flame radiative feedback to the solid plays a more important role in two-dimensional flames. With high solid fuel absorptivity, a peak in the flame spread rate occurs at an intermediate value of flame radiation strength---due to the competition between two mechanisms: gas-radiation heat loss weakening the flame and the radiative feedback boosting the solid pyrolysis. Two-dimensional calculations suggest that a larger percentage of unreacted fuel vapor can escape from the flame when the flame radiation strength is high.
590 $a School code: 0042.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, General. $3 1018488
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710 2 $a Case Western Reserve University. $3 1017714
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0042
790 1 0 $a T'ien, James S., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253685