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Influence of engine compartment packaging on the cooling airflow
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The cooling system is an essential part of a vehicle, and one important element of this is the supply of cooling airflow. Volvo Car Corporation uses CFD-computations in the development of the cooling system. Today, a relative simple model of the engine compartment is used and there is a limited knowledge of the engine compartment flow. A better knowledge of the engine compartment flow and how a denser packed and more accurate model will influence the results of the simulations is desirable. The object of this project has been to get better understanding of the engine compartment flow and to give recommendation of which model that should be used in the simulations. The commercial CFD-code, Fluent, has been used to simulate the cooling airflow. TA engine compartment model used by the CFD-group today has been used as a Reference model. A number of new engine compartment models, with different packaging level, were created. These models has been simulated and compared to the Reference model. A lot of emphasis in the analysis has been on the important mass flow rate of the air, which is linked to the coolant temperature. It was found that the model used today is adequate to compute the coolant temperature and the air mass flow rate through the radiator. A denser packed model did not give any improved results for this type of simulation. It was found that the fan shroud and fan are a major cause to a lower air mass flow rate. The most important influencer inside the engine compartment to the cooling airflow is the components behind the fan. In this vehicle model, the component behind the fan is the engine block. A denser and accurate packed model includes more components but right behind the fan it is much the same as the Reference model. This means that additional components will not significantly contribute to any blockage of air entering the compartment. It is recommended to use the same packaging level as the Reference model when interest are in coolant temperature and mass flow rate through radiator. A denser packed and more accurate model will give a better description of the flow field inside the engine compartment. The use of a more detailed and denser packed compartment is recommended when the local flow field inside the compartment is of interest. However, the use of a detailed model should be carefully considered since problem can arise. These problems are mostly related to the mesh. A mesh study should be performed before implementing a detailed engine compartment model in simulations. The use of a detailed model also involves a more time consuming process. Especially the time of preparing CAD-data and mesh generation is increased.

Place, publisher, year, edition, pages
Keyword [en]
Technology, engine compartment, cooling airflow, CFD, vehicle, fluid dynamics, strömningslära, kylluft, motorrum
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42436ISRN: LTU-EX--02/146--SELocal ID: 072c1ef1-5e2e-4168-8de8-ee164a6d6a4eOAI: diva2:1015657
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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