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Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   SEPTEMBER 2012 , Volume 25 , Number 3 (TRANSACTIONS C: ASPECTS); Page(s) 239 To 247.
 
Paper: 

THE NUMERICAL EXERGY ANALYSIS OF H2/AIR COMBUSTION WITH DETAILED CHEMICAL KINETIC SIMULATION MODEL

 
 
Author(s):  JAFARMADAR S.*
 
* FACULTY OF MECHANICAL ENGINEERING, URMIA UNIVERSITY, URMIA, IRAN
 
Abstract: 

Energy and exergy concepts come from thermodynamics laws and are applicable to all fields of science and engineering. This study considers numerical simulations of combustion of hydrogen with air in a constant pressure environment and exergy terms according to first and second laws analysis using homemade code. Chemical kinetic model includes 20 reactions and 9 species. At the first stage of present study, the effects of airl-fuel ratio (j) on energy and exergy terms are investigated for different j (from 0.6 to 1.4) at constant temperature 1000 (K). The predictions show that the increase of j from 0.6 to 1 increases average temperature, thermo-mechanical and chemical exergys and ireversibilty, while increase of j from 1 to 1.4 decreases them, except for chemical and total exergys. Also secondlaw efficiency increases with increasing of j. At the second stage, at j=1.4, in which the second-law efficiency is maximum, initial temperature of mixture (T) is varied from1000 to 1400 (K) by 100 (K) step. The predictions show that increase of T from 1000 to 1100 (K) increases average temperature, thermomechanical, total exergy and irreversibility while decreases the chemical exergy and second-law efficiency. Also, the increase of T from 1100 to 1400 (K) increases the thermo-mechanical, chemical total exergys and second-law efficiency, while irreversibility decreases. It was found that second-law efficiency reaches a maximum value in the case of higher airl-fuel ratio and initial temperature.

 
Keyword(s): AIR-FUEL RATIO, COMBUSTION, EXERGY, ENERGY, IRREVERSIBILITY, CHEMICAL KINETICS
 
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