Browse Publications Technical Papers 2005-01-0210
2005-04-11

Computational Study of Heat Transfer to the Walls of a DI Diesel Engine 2005-01-0210

In this paper the heat transfer of the hot gases to the cylinder walls of DI Diesel engines is analyzed using Computational Fluid Dynamics (CFD) and compared to the predictions obtained with a zero-dimensional thermodynamic model based on a variant of the Woschni equation. The final objective is to improve the simple model by modifying the original equations to better take into account the influence of important parameters, such as swirl, on the heat transfer.
CFD calculations of the compression and expansion strokes have been made for two real DI Diesel engine geometries, a small one with a displacement of 0.4 l. and a heavy duty one of 2.0 l., and for different working points.
The total heat transfer rate to the cylinder surfaces is highly dependent on the mean flow behavior and turbulence levels. Hence, starting from initial conditions at Inlet Valve Closing (IVC), various parametric studies have been performed to take into account the influence on the heat transfer of the level of swirl on the one hand, of engine speed on another, and of modifying the clearance height on another.
Solutions obtained with both the CFD simulation and the diagnosis model are compared. They show that there are some important differences due to the assumptions made in the thermodynamic model concerning these parameters. Interesting conclusions are drawn from the more accurate CFD results and a simple modification of the terms included in the Woschni-like equation of the thermodynamic model is proposed to better take into account the significant influence of the swirl on the heat transfer.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% 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

Simulation and Analysis of Combustion and Heat Transfer in Low Heat Rejection Diesel Engine Using Two Zone Combustion Model and Different Heat Transfer Models

2003-01-1067

View Details

TECHNICAL PAPER

Improving Heat Transfer in Single Cylinder DI Engine through Optimization of Coolant Flow Distribution

2015-01-1663

View Details

TECHNICAL PAPER

Numerical Investigations Of Piston Cooling Using Oil Jet

2004-28-0061

View Details

X