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Research on Numerical Simulation of Soot Formation in a 2-D Simplified Gas Turbine Combustor

Author: LiHongHong
Tutor: LiuYong
School: Nanjing University of Aeronautics and Astronautics
Course: Environmental Engineering
Keywords: Soot particles Moment model EDC model Detailed reaction mechanism Environmental Effects
CLC: V231.2
Type: Master's thesis
Year: 2008
Downloads: 125
Quote: 0
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Abstract


Soot particles is inevitable when the fuel combustion product, which is a the atmospheric particulate contaminants from a variety of macromolecules reunion. Emissions of soot particles will bring great harm to human health, caused by a series of atmospheric environmental effects. Aero engine combustion chamber are also generated when the internal combustion soot particles and carbon black particles in the combustion chamber, the internal radiation will affect the accuracy of the numerical simulation of the combustion, particularly obvious influence on the flame temperature and the wall temperature. In order to understand the carbon black particles in the distribution of the air inside the combustion chamber of the engine, in this article from the carbon black particles generate detailed mechanism and detailed model, the first use of the numerical simulation of combustion flow field based on detailed chemical reaction mechanism of n-heptane, affect carbon concentration distribution of the black particles generated components, and to consider the impact of the different coefficient of residual gas components generated; then use the carbon black particles generate detailed numerical simulation model of the formation of carbon black particles in the aero-engine, at the same time the soot particle size distribution in the different sections. In this paper, a the k? Ε two-equation model to estimate the turbulence characteristics EDC turbulent combustion model to estimate the rate of the chemical reaction, the amount of four-way radiation model to estimate the radiation flux, PSR module to handle complex chemical reaction term, using the moment model processing the distribution of the particle size of carbon black. The CHEMKIN software mechanism compiler generates mechanism connection file for the FORTRAN the calculation procedure call, call CHEMKIN software API function to handle the complex chemical reactions related items in the calculation process. Control volume method in a staggered grid system to discrete control equation, and discrete equation is solved using the SIMPLE algorithm. Using the wall functions under arbitrary curvilinear coordinate system to handle the flow near the wall of the combustion chamber area. Calculate the carbon black particle size distribution of four different residual gas coefficient under different sections, taking into account the different conditions on the size distribution of the carbon black particles. The numerical simulation results with the jet flame carbon black particles distribution analogy, analysis of the component concentration on the formation and oxidation of soot particles in the system. Satisfactory results, optional model to meet the physical process, and to some extent reflect the reliability of the calculation procedure.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Engine theory > Combustion theory
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