Multi-Objective Adjoint Optimization of Intake Port Geometry Engys

Format:

Conference/Event

Author/Creator:

de Villiers, de Villiers, author.

Contributor:

Othmer, Carsten

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Meeting the stringent efficiency demands of next generationdirect injection engines requires not only optimization of theinjection system and combustion chamber, but also an optimalin-cylinder swirling charge flow. This charge motion is largelydetermined by the shape of the intake port arm geometry and thevalve position.In this paper, we outline an extensible methodology implementedin OPENFOAM® for multi-objective geometry optimization based on thecontinuous adjoint. The adjoint method has a large advantage overtraditional optimization approaches in that its cost is notdependent upon the number of parameters being optimized. Thischaracteristic can be used to treat every cell in the computationaldomain as a tunable parameter - effectively switching cells"on" or "off" depending on whether this actionwill help improve the objectives. Unlike CAD-based parameteroptimization, the adjoint approach starts from a supplied designspace and then systematically removes all elementscounter-productive to the design objectives. The final design isthen the fluid volume left over after all the counter-productiveelements have been blocked.The adjoint system is implemented as an adjunct to acompressible steady state flow solver with the ability to maximizethe swirl in a target volume while minimizing the pressure loss ofthe system. The tool is used to optimize the shape of the intakeport arms of a combustion chamber in a static flow testconfiguration. A range of results were produced at differentweightings of the pressure loss and swirl objectives and theability to generate a trade-off curve between the objectives isdemonstrated. At the high end, an increase in swirl of up to 250%was observed for modest increases in pressure loss, unequivocallyproving the effectiveness of the new methodology

Notes:

Vendor supplied data

Publisher Number:

2012-01-0905

Access Restriction:

Restricted for use by site license