Thermodynamic irreversibilities and second law analysis in a spray combustion process
Thermodynamic irreversibilities and second law analysis in a spray combustion process
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DOI：
10.1080/00102209908924187
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发表时间：
1999-01-01
影响因子：
1.9
通讯作者：
Som, SK
中科院分区：
文献类型：
--
作者：
Datta, A;Som, SK
建立了喷雾燃烧过程火用分析的理论模型，该模型基于可用性传递和流动可用性，可用于评价喷雾燃烧过程在各种工况下的热力学不可逆性和第二定律效率。在燃烧室中的速度，温度和浓度场，所需的可用性和不可逆性的评估，已经从两相分离流模型的喷雾沿着合适的反应动力学的气相反应数值计算。燃烧室气相过程的热力学不可逆性由熵输运方程得到，相间输运过程的热力学不可逆性由气相不可逆性与总不可逆性之差得到。与不同过程相关的热力学不可逆性和第二定律效率在不同操作条件下的变化的比较图已经被提出来，以揭示喷雾燃烧过程中燃烧效率和损失功之间的权衡。
A theoretical model of exergy analysis, based on availability transfer and flow availability, in the process of spray combustion has been developed to evaluate the total thermodynamic irreversibility and second law efficiency of the process at various operating conditions. The velocity, temperature and concentration fields in the combustor, required for the evaluation of the availabilities and irreversibilities, have been computed numerically from a two phase separated flow model of the spray along with a suitable reaction kinetics for the gas phase reaction. The thermodynamic irreversibilities associated with the gas phase processes in the combustor have been obtained from the entropy transport equation, while that due to the interphase transport processes have been obtained as a difference of gas phase irreversibilities from the total irreversibility. The thermodynamic irreversibilities associated with different processes and a comparative picture of the variation of second law efficiency at various operating conditions have been made to throw light on the trade-off between the effectiveness of combustion and the lost work in a spray combustion process.