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Implementation of Reduced Mechanism in Complex Chemically Reacting Flows

Maktal, Jathaveda
http://rave.ohiolink.edu/etdc/view?acc_num=case1238707685

Abstract Details

2009, Master of Sciences (Engineering), Case Western Reserve University, EMC - Aerospace Engineering.
Numerical investigation is conducted to study the combustion performance of Jet Stirred Reactor (JSR) by burning mixtures of CH4 and air. Based on the detailed mechanism of GRI-Mech 3.0, a skeletal mechanism of 29 species and 150 elementary reaction steps and a reduced mechanism of 19 species and 15 lumped reactions are generated and computed to compare their predictive capabilities with the detailed mechanism. The skeletal mechanism is generated using the method of directed relational graph with error propagation and sensitivity analysis (DRGEPSA) and reduced mechanisms are generated using the method of Quasi Steady State (QSS) assumptions. The mechanisms are validated in homogeneous applications like perfectly stirred reactor (PSR) and auto-ignition. These mechanisms along with a similar 19 species ARM, a reduced mechanism from a previous study, are implemented into a commercial CFD package. A three dimensional modeling on a JSR is considered. The three dimensional turbulent flow inside the reactor is modeled using the Realizable k-ε model and enhanced wall functions are considered for near wall treatment. The equivalence ratios of 1 and 0.5 with the inlet temperature of 600K are considered for the boundary conditions. The dependence of turbulence on finite rate chemistry is considered by invoking turbulence-chemistry models. Comparing the results obtained from the skeletal and reduced mechanisms with the detailed mechanism it is found that there is a good agreement in the predictions like temperature and major species such as CH4, O2, H2O and CO2. Among the pollutant species of CO and NO similar comparison shows that there is good agreement of CO between the mechanisms but the same cannot be said about NO. There is a considerable computational time savings in using the resulting skeletal and reduced mechanisms for the simulations, but the computational time saving achieved by the 19 species reduced mechanism is comparable to that of the 29 species skeletal mechanism. The time savings obtained by the reduced mechanism is not large as compared to the skeletal mechanism because the time consumed to solve the QSS relations is high.
Chih-Jen Sung, PhD (Committee Chair)
James S T'ien, PhD (Committee Member)
Yasuhiro Kamotani, PhD (Committee Member)
95 p.
Engineering
Reduced Mechanism

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Citations

  • Maktal, J. (2009). Implementation of Reduced Mechanism in Complex Chemically Reacting Flows [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1238707685

    APA Style (7th edition)

  • Maktal, Jathaveda. Implementation of Reduced Mechanism in Complex Chemically Reacting Flows. 2009. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1238707685.

    MLA Style (8th edition)

  • Maktal, Jathaveda. "Implementation of Reduced Mechanism in Complex Chemically Reacting Flows." Master's thesis, Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1238707685

    Chicago Manual of Style (17th edition)

case1238707685
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© 2009, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.