Analysis of entropy generation in non-premixed hydrogen versus heated air counter-flow combustion

被引:39
作者
Chen, Sheng [1 ]
Han, Haifeng [1 ]
Liu, Zhaohui [1 ]
Li, Jing [1 ]
Zheng, Chuguang [1 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Entropy generation; Second law analysis; Non-premixed hydrogen-air combustion; Lattice Boltzmann method; LATTICE BOLTZMANN METHOD; NATURAL-CONVECTION; TEMPERATURE; MODEL; SIMULATION; IGNITION; FLAMES;
D O I
10.1016/j.ijhydene.2010.02.113
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, entropy generation in non-premixed hydrogen versus heated air counter-flow combustion confined by planar opposing jets is investigated for the first time. The effects of the volume percentage of hydrogen in fuel mixture and the inlet Reynolds number (corresponding to the global stretch rate) on entropy generation are studied by numerical evaluating the entropy generation equation. The lattice Boltzmann model proposed in our previous work, instead of traditional numerical methods, is used to solve the governing equations for combustion process. Through the present study, three interesting features of this kind of combustion, which are quite different from that reported in previous literature on entropy generation analysis for diffusion hydrogen-air flames, are revealed. Moreover, it is observed that the whole investigated domain can be divided into two parts according to the predominant irreversibilities. The total entropy generation number can be approximated as a linear increasing function of the volume percentage of hydrogen in fuel mixture and the inlet Reynolds number for all the cases under the present study. It is very interesting that most characteristics in this kind of diffusion combustion also can be found in its premixed counterpart investigated in our previous work. Especially, the critical Reynolds numbers determining the order of the predominant irreversibilities in this type of diffusion flame are same as its premixed counterpart, although the flow and scalar fields between them are quite different. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:4736 / 4746
页数:11
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