Development of Laminar Burning Velocity Correlation for the Simulation of Methanol Fueled SI Engines Operated with Onboard Fuel Reformer

Paper #:
  • 2017-01-0539

Published:
  • 2017-03-28
Abstract:
Using methanol as a fuel for spark ignition (SI) engines can increase the thermal efficiency due to its physico-chemical properties. The efficiency can be further improved with an advanced heat recovery system, used for fuel reforming to produce hydrogen rich gas (syngas). This paper deals with two reforming concepts, one in which the reformer uses water from an extra tank and another that employs the water vapor in the exhaust gas recirculation (EGR) stream to produce reformed-EGR (R-EGR). To study the full potential of these engine concepts, simulation is needed. Good prediction of turbulent combustion behavior is very important to track the flame propagation and resolve in-cylinder pressure and temperature. In order to do this, the laminar burning velocity correlation for both concepts valid at engine-like conditions is required. This work uses a one-dimensional flame simulation tool with a comprehensive kinetic mechanism to predict the laminar burning velocities of methanol/syngas blends and correlate it. The syngas is a mixture of H2/CO/CO2 with a CO selectivity of 6.5% to simulate the methanol steam reforming products over a Cu-Mn catalyst. The simulation was exercised over syngas contents in the blend, fuel-air equivalence ratios, pressures, unburned gas temperatures and EGR ratios ranging respectively from 0% to 50%, 0.5 to 1.5, 10 to 85 bar, 550 to 800 K (limited by the self-ignition of the mixtures) and 0% to 30% (by mass). Using the developed correlations, the influence of the dilution methods are investigated to find the optimal approach for mixture dilution. With the same mass fraction of methanol to the reformer catalyst and the same EGR ratio, the laminar burning velocity in the R-EGR concept is greater as the hydrogen concentration in the mixture increases. It shows the potential of the R-EGR technology to support high levels of EGR dilution in SI engines.
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