Browse Publications Technical Papers 2001-01-1012
2001-03-05

Knock Prediction in Reciprocating Gas-Engines Using Detailed Chemical Kinetics 2001-01-1012

Two and three-dimensional test cases were simulated using a detailed kinetic mechanism for di-methyl ether to represent methane combustion. A piston-bowl assembly for the compression and expansion strokes with combustion has been simulated at 1500 RPM. A fine grid was used for the 2-D simulations and a rather coarse grid was used for the 3-D calculations together with a k-ε subgrid-scale turbulence model and a partially stirred reactor model with three time scales. Ignition was simulated artificially by increasing the temperature at one point inside the cylinder. The results of these simulations were compared with experimental results. The simulation involved an engine with a homogeneous charge of methane as fuel. Results indicate that pressure fluctuations were captured some time after the ignition started, which indicates knock conditions. Detailed analysis of the pressure data showed that knock was present in the simulations and exhibited similar characteristics to the ones observed in experiments. The pressure oscillation frequency was around 5-14 kHz for the simulations, which is well within the in-cylinder pressure oscillation frequency range ∼3-25 kHz captured during knock via measurements. The oscillations lasted for ∼20° CA which was also experimental observed.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

An Analysis on Time Scale Separation for Engine Simulations with Detailed Chemistry

2011-24-0028

View Details

TECHNICAL PAPER

Development of an Improved Fractal Model for the Simulation of Turbulent Flame Propagation in SI Engines

2005-24-082

View Details

TECHNICAL PAPER

Pre-ignition characterization of partially-stratified natural gas injection

2007-01-1913

View Details

X