Effect of unsteady pressure rise on flame propagation and near-cold-wall ignition |
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| Institution: | 1. Graduate Aerospace Laboratories (GALCIT), California Institute of Technology, Pasadena, CA 91125, USA;2. UPR 3346 CNRS, ISAE-ENSMA, Institut Pprime, 86961 Futuroscope-Chasseneuil Cedex, BP 40109, France;1. Institute for Simulation of reactive Thermo-Fluid Systems, TU Darmstadt, Otto-Berndt-Straße 2, Darmstadt 64287, Germany;2. CORIA CNRS, Normandie Université, INSA de Rouen, Technopôle du Madrillet, BP 8, Saint-Étienne-du-Rouvray 76801, France;1. Grupo de Mecânica de Fluidos Reativos, Instituto Nacional de Pesquisas Espaciais, Cachoeira, Paulista-SP 12630-000, Brazil;2. Grupo de Fenômenos de Transporte Avançado, Universidade Federal do Pampa, Alegrete-RS 97546-550, Brazil;1. School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia;2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;3. School of Photovoltaic and Renewable Energy Engineering University of New South Wales, Sydney, NSW 2052, Australia;4. Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139, USA |
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| Abstract: | Thermodynamic pressure rise during combustion is a key feature in internal combustion engines. Yet, hardly any studies have been conducted to investigate the effects of transient pressure rise on flame propagation as well as on the ignition of the unburned gas. In this study, the effects of unsteady pressure rise were parametrically studied using a one-dimensional reacting flow model in which the thermodynamic pressure variation is an independent variable and thus its rate of rise can be controlled. It was determined that large rates of pressure rise can significantly increase the mass burning flux of a laminar flame and that this modification becomes more pronounced at higher pressure and temperature conditions. Furthermore, it was shown that the development of ignition near a cold wall, for mixtures that exhibit negative temperature coefficient behavior, is very sensitive to rate of change of pressure. The near-wall ignition behavior was found also to be rather sensitive to the prevailing pressures and temperatures whose values control whether ignition will occur in the main-gas or within the thermal boundary layer. |
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