Indian Journal of Science and Technology

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Objective: For power generation through micro gas turbine, the micro combustion chamber is essential component. Due to higher flammability limits and less reaction time as compare to hydrocarbon fuel, hydrogen is selected as a fuel. For designand fabrication of micro combustion chamber analytical and numerical analysis is required to study. Analysis with variations in reactant inlet temperature from lean condition (Equivalence ratio = 0.1) to fuel rich condition (equivalence ratio = 1.2) was taken. The optimized results obtained from analytical study are used as designed parameters for design of micro combustor. Methods Statistical Analysis: O’Conaire, GRI Mech 3.0 and O’Conaire reaction mechanism with Zeldovich NO are used for hydrogen or air combustion analytical studies. O’Conaire mechanism with Zeldovich NO is used in computational fluid dynamic studies using ANSYS CFX software. For numerical study, the BVM partial premixed combustion model is used for calculation of 41 reaction and 11 reactive species with Zeldovich NO. Finding: For three different chemical reaction mechanisms, the flame temperatures at different equivalence ratio were evaluated. The increase in the equivalence ratio from 0.1 to 1.2 resulted in increase of the flame temperature up to the stoichiometric condition and thereafter decreases. Results of simulation show good agreement with analytical studies. At 0.132 equivalence ratio (ɸ), flame temperature is around 670 K, deduce from both chemical kinetics and CFD simulation. Application/Improvement: Combustion process is effectively work at lower equivalence ratio in micro scale combustor which is summarized after analytical and numerical analysis. At lower equivalence ratio, heat losses are reduced which results in higher efficiency of the micro combustor in gas turbine engine during experimental work. The main application of electricity generation via the heat released by the combustor using the Seebeck and Peltier effect.

Keywords

Equivalence Ratio, Flame Temperature, GRI Mech 3.0 Mechanism, Micro Combustion, O’Conaire Mechanism
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