Multiphase CFD-CHT Analysis and Optimization of the Cooling Jacket in a V6 Diesel Engine Universita' di Modena e Reggio Emilia

Format:

Conference/Event

Author/Creator:

Fontanesi, Fontanesi, author.

Contributor:

Cicalese, Giuseppe

Giacopini, Matteo

Conference Name:

SAE 2010 Powertrains Fuels & Lubricants Meeting (2010-10-25 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The paper presents a numerical activity directed at the analysisand optimization of internal combustion engine water coolingjackets, with particular emphasis on the fatigue-strengthassessment and improvement.In the paper, full 3D-CFD and FEM analyses of conjugate heattransfer and load cycle under actual engine operation of a singlebank of a current production V6 turbocharged diesel engine arereported.A highly detailed model of the engine, made up of both thecoolant galleries and the surrounding metal components, id est, theengine head, the engine block, the gasket, the valve guides andvalve seats, is used on both sides of the simulation process toaccurately capture the influence of the cooling system layout underthermal and load conditions as close as possible to actual engineoperations.Concerning the CFD side, a 50-50 binary mixture ofethylene-glycol and water is used in order to correctly reproducethe coolant behavior, while boundary conditions are derived from acombination of experimental measurements and a CFD-1D model of thewhole engine.In order to find a proper CFD setup for the optimization of thethermal behavior of the engine, a preliminary comparison betweenexperimental temperature distribution within the engine head andCFD forecasts is carried out. Eight thermocouples are used tomeasure the engine head local temperature at some criticallocations.Among the many competing numerical sub-models involved in theCFD simulations, particular attention is devoted to the modeling ofphase transition and vapor nuclei formation within the coolantgalleries.Concerning the FEM side, thermo-mechanical analyses are carriedout aiming at addressing the design optimization of the engine interms of fatigue strength. In view of the wide range of thermal andload conditions, both high-cycle and low-cycle fatigue must beproperly characterized by means of ad-hoc criteria. An energy-basedcriterion specifically suited for low-cycle fatigue regions istherefore superimposed to well-established S-N o ε-N criteria forthe high cycle fatigue regions.The proposed methodology shows very promising results in termsof point-wise detection of possible engine failures and proves tobe an effective tool for the accurate thermo-mechanicalcharacterization of internal combustion engines under actuallife-cycle operations

Notes:

Vendor supplied data

Publisher Number:

2010-01-2096

Access Restriction:

Restricted for use by site license