Ignition in Nonpremixed Counterflowing Hydrogen versus Heated Air: Computational Study with Skeletal and Reduced Chemistry

摘要: Abstract Nonpremixed ignition of counterflowing H 2 against hot air is studied numerically with emphasis on developing simplifying approximations to the conservation equations governing this system. We derive and examine a number different “skeletal” “reduced” chemical reaction mechanisms that are used simplify full kinetic mechanism consisting 9 species 19 bidirectional elementary steps. It found use inherently homogeneous such as steady-state or partial equilibrium in derivation reduced can lead significant errors inhomogeneous demonstrate step R11 (H + HO → 2OH) plays critical kinetically controlled –air ignition, present 6-step skeletal which represents smallest set reactions will provide proper turning point behavior first second limits. A new sensitivity analysis methodology introduced quantifies system response, particularly near point, important parameters equations. also so-called decoupled environment approximation takes place within static environment, temperature major concentration profiles, from be solved independently minor profiles.