Large eddy simulation of spark ignition in a turbulent methane jet
نویسنده
چکیده
Large Eddy Simulation (LES) is used to compute the spark ignition in a turbulent methane jet flowing into air. Full ignition sequences are calculated for a series of ignition locations using a one-step chemical scheme for methane combustion coupled with the thickened flame model. The spark ignition is modeled in the LES as an energy deposition term added to the energy equation. Flame kernel formation, the progress and topology of the flame propagating upstream, and stabilization as a tubular edge flame are analyzed in detail and compared to experimental data for a range of ignition parameters. In addition to ignition simulations, statistical analysis of non-reacting LES solutions are carried out to discuss the ignition probability map established experimentally.
منابع مشابه
Large Eddy Simulation of a Turbulent Lifted Flame via Rate-Controlled Constrained Equilibrium
via Rate-Controlled Constrained Equilibrium S. Rigopoulos , S. Navarro-Martinez , 1 School of Mechanical, Aerospace and Civil Engineering, University of Manchester, UK 2 Department of Mechanical Engineering, Imperial College London, UK Abstract The objective of this paper is the simulation of a turbulent lifted flame via employing Rate-Controlled Constrained Equilibrium (RCCE) for the chemistry...
متن کاملProviding a thermodynamic model to simulate the spark ignition engine fueled with natural gas and ethanol mixture
The use of natural gas as an alternative fuel, in recent decades has been proposed. Good combustion properties and cats less than it could be the perfect choice for the next generation. Simulation models can be of great help engine designers. Simulation models to reduce the time and costs for the development of new engines as well as in identifying the technical value that need special attentio...
متن کاملSimulations of edge-flame propagation in turbulent non-premixed jets
Ignition, flame propagation and stabilisation have been simulated and analysed in a turbulent jet of non-premixed methane and air. The first order Conditional Moment Closure (CMC) turbulent combustion model was fully coupled with a Reynolds-Averaged Navier Stokes (RANS) flow simulation. A CMC model was developed to account for spark ignition. The over-prediction of turbulent flame propagation w...
متن کاملSpark Ignition of Turbulent Methane/air Mixtures Revealed by Time-resolved Planar Laser-induced Fluorescence and Direct Numerical Simulations
By use of high-speed planar laser-induced fluorescence (PLIF) imaging, the evolution of turbulent reactive flows was recorded and studied in real time in a filmlike manner. The technique was used to track the concentration field of the OH radical, which was produced during spark ignition of a turbulent methane/air mixture. The results were compared qualitatively to a two-dimensional direct nume...
متن کاملNumerical Investigation of Spark-ignition in a Laminar Methane-air Counterflow
Simulations of forced ignition in a non-premixed laminar counterflow are used to study the effect of the strain rate on ignition success. A one dimensional calculation is performed, using detailed methane chemical kinetics, and treating the ignition event as an instantaneous heat release. Ignition success is seen to depend on the mixture composition and spark location, resulting in lean and ric...
متن کامل