Characteristics of Syngas Auto-ignition at High Pressure and Low Temperature Conditions with Thermal Inhomogeneities
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Conference PaperKAUST Department
Clean Combustion Research CenterComputational Reacting Flow Laboratory (CRFL)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2015-05-31Online Publication Date
2015-05-31Print Publication Date
2015Permanent link to this record
http://hdl.handle.net/10754/556643
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Effects of thermal inhomogeneities on syngas auto-ignition at high-pressure low-temperature conditions, relevant to gas turbine operation, are investigated using detailed one-dimensional numerical simulations. Parametric tests are carried out for a range of thermodynamic conditions (T = 890-1100 K, P = 3-20 atm) and composition (Ф = 0.1, 0.5). Effects of global thermal gradients and localized thermal hot spots are studied. In the presence of a thermal gradient, the propagating reaction front transitions from spontaneous ignition to deflagration mode as the initial mean temperature decreases. The critical mean temperature separating the two distinct auto-ignition modes is computed using a predictive criterion and found to be consistent with front speed and Damkohler number analyses. The hot spot study reveals that compression heating of end-gas mixture by the propagating front is more pronounced at lower mean temperatures, significantly advancing the ignition delay. Moreover, the compression heating effect is dependent on the domain size.Citation
Characteristics of Syngas Auto-ignition at High Pressure and Low Temperature Conditions with Thermal Inhomogeneities 2015, 66:1 Energy ProcediaPublisher
Elsevier BVJournal
Energy ProcediaConference/Event name
23rd International Conference on the Application of Accelerators in Research and Industry, CAARI 2014Additional Links
http://linkinghub.elsevier.com/retrieve/pii/S1876610215001034ae974a485f413a2113503eed53cd6c53
10.1016/j.egypro.2015.02.003