CHEMKIN-PRO_Flame_Extinction_Strain_Rate_Simulations

CHEMKIN-PRO_Flame_Extinction_Strain_Rate_Simulations -...

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Application Note: CHEMKIN-PRO™ Flame-Extinction Strain Rate Simulations CAPP-Extinction (v1.0) September 7, 2010 ©Reaction Design. All rights reserved. All Reaction Design trademarks, patents, and disclaimers are listed at www.reactiondesign.com . All other trademarks and registered trademarks are the property of their respective owners. All specifications are subject to change without notice. CAPP-Extinction (v1.0) September 7, 2010 www.reactiondesign.com 1 1-858-550-1920 Summary In this application note, the Flame-Extinction Model in CHEMKIN-PRO is used to provide calculations of the extinction strain rate for specific fuel compositions and operating conditions, under opposed-flow flame configurations. Extinction strain rate is a key combustion performance measure related to Lean Blow Off (LBO) and rich extinction in gas turbines, burners and other combustion equipment. The Importance of Understanding the Impact of Fuels and Operating Conditions on Extinction Flame extinction is a critical combustion performance factor in t low emissions combustors, burners, rockets and many other combustion devices. The use of staged combustion, rich and lean, lowers peak flame temperatures producing less NOx also moves the flame closer to the extinction point. Combustion parameters such as Lean Blow Off (LBO) and combustion dynamics are flame-extinction events. Fuels such as Liquefied Natural Gas (LNG) have higher concentrations of heavy hydrocarbon gaseous components, such as ethane and propane, than are present in natural gas. These higher- carbon-number gases (C2 to C5) can impact the extinction characteristics and produce undesirable combustion effects. Flame extinction is characterized by the operating conditions, local fuel/air ratio and the reaction chemistry of the fuel. Flame-Extinction Model Setup The application note describes how to use the Flame-Extinction Model in CHEMKIN-PRO to determine the extinction strain rate of a flame. Extinction analysis is conducted for a premixed stoichiometric methane-air flame at 1 atm pressure. A reduced (17 species) methane-air mechanism is used in this application. There is a tutorial based on this application called opposed-flow_flame__extinction.ckprj located in the samples2010 directory. The stoichiometric methane-air mixture is assigned to inlet 1 (named
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This note was uploaded on 01/31/2011 for the course CHEM 101 taught by Professor Nobody during the Spring '10 term at SUNY Adirondack.

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CHEMKIN-PRO_Flame_Extinction_Strain_Rate_Simulations -...

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