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上传于：2015-12-29

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    188宝金博页面版: Development of a computational scheme for transient combustion inside a refractory tube

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    内容提示： Development of a Computational Scheme for Transient Combustion inside a Refractory Tube RAPEPUN KANSUNTISUKMONGKOL Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Japan HIDEO MIYACHI Okayama University, Okayama, Japan HIROYUKI OZOE* Institute of Advanced Material Study, Kyushu University, Japan S. W. CHURCHILL Department of Chemical Engineering~ University of Pennsylvania, USA A computational scheme was developed for the transient combustion of premixed propane and air inside ...

    文档格式：PDF | 页数：18 | 浏览次数：868 | 上传日期：2015-12-29 23:27:29 | 文档星级：
    Development of a Computational Scheme for Transient Combustion inside a Refractory Tube RAPEPUN KANSUNTISUKMONGKOL Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Japan HIDEO MIYACHI Okayama University, Okayama, Japan HIROYUKI OZOE* Institute of Advanced Material Study, Kyushu University, Japan S. W. CHURCHILL Department of Chemical Engineering~ University of Pennsylvania, USA A computational scheme was developed for the transient combustion of premixed propane and air inside an adiabatic refractory tube. To test this scheme, steady-state solutions were obtained to provide initial and final conditions for the transient combustion. Multiple steady-state solutions were found to exist for some combinations of the mass flow rate and the wall temperature at the inlet for a specified fuel-air ratio. Since complete transient computations that included the tube-wall temperature took an excessive amount of time, illustrative computations were carried out to completion only for a fixed tube-wall temperature that had previously been computed from a steady-state model. These transient computations for such a fixed tube-wall temperature provide a good approximation for the general behavior for short times owing to the great thermal inertia of the wall. The flame front moved very quickly toward the new location not only from an upstream location to a downstream one, but also from a downstream location to an upstream one. The movement of the flame front to a new location after heating the tube wall for a short time was also successfully computed. These results suggest that the wall temperature profile is the primary determinant of the stability of the flame in a refractory tube. Copyright © 1997 by The Combustion Institute NOMENCLATURE Gr A c area for conduction (m E) h H(Z) Af frequency factor of chemical reaction (m3/kg • S) - A H B(Z) radiosity (W/m E) [ Bi Biot number = Dh/k w Bi'i' = D[h i + eorT/3(0w 3 + OweOi + OwOi 2 J + Oi3)]/kw Bi' o = D[h o + ~o'T/3(0w 3 + Ow20o -4- OwOo 2 k -4- Oo3)]/kw K(Z) C specific heat capacity (J/kg- K) D tube diameter (m) E energy of activation (J/mole) l L F m_, . shape factor for radiation from sur- P face m to surface n Pr F(Z) configuration factor from disk plane at the tube end to a differential ring aconv G dimensionless rate of reaction = 7rD3y/ 4W aform * Corresponding author. 0010-2180/97/$17.00 PII S0010-2180(96)00100-9 Oh Graetz number = Wfg/kgz heat transfer coefficient (W/m 2 • K) irradiosity (W/m 2) heat of reaction (J/kg) dimensionless parameter = - AHDy/hT i dimensionless parameter = hlrD3/ kwA¢ thermal conductivity (W/m- K) configuration factor between two dif- ferential rings on the inside surface of the tube at a distance Z apart tube length (m) dimensionless tube length = l/D pressure (N/m 2) Prandtl number = Cg tzg/kg heat convected into a control volume from a tube wall (W) heat released by combustion in a con- trol volume (W) heat convected into a control volume from mixed gas (W) COMBUSTION AND FLAME 108:158-172 (1997) Copyright © 1997 by The Combustion Institute Published by Elsevier Science Inc.

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