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Thermal CFD simulations of Scania engine test cell
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
2017 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

In engine development, measurements of thermal and mechanical engine perfor-mance is done in the so called engine test cell. In an ideal case, the engine test cell is designed to provide the same conditions as in a full truck installation. One of the most significant problems today is to understand the ventilation and the air dynamics in the test cell and how it affects the measurements. By the means of thermal CFD (Computational Fluid Dynamics) simulations we can understand the flow characteristics in a way that is impossible by simple measurements. The aim of this project is thus to understand the air flow dynamics, how heat is distributed in the engine test cell and its influence on the measurements, by the use of CFD. The procedure was to do measurements on the engine and use the results as boundary conditions on the engine as well as for validation of the simulation results. Temper-ature measurements on points of the surface for boundary conditions and points in the air for simulation validation. A transient simulation was then performed for a complex engine model in the CFD software PowerFLOW. The resulting simulation predicted the temperature at air points right after the engine fan within a relative error of 6% and less good at the turbo area, within 68%. This means that our simulation method predicted the temperature and thus the complex mixing of air after the fan well enough, but poorly at the back of the engine. This may be due to problems with the measurements but also radiation effects and gas leakages in the test cell, not considered in the simulation. A shield was put over the engine, to resemble the case when installed in a truck, that showed to increase the heat trans-fer coefficients, h, up to 366%. We conclude that the measurements in the test cell are highly affected by the complexity of the air flow. For future work the internal heat generation can be included in the simulation in order to predict the surface temperatures. It is also of importance to evaluate the effects of radiation and the extent of exhaust gas recirculation in the engine test cell.

sted, utgiver, år, opplag, sider
2017.
Emneord [en]
Computational fluid dynamics, thermodynamics, vehicle thermal management, underhood cooling, heat transfer
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-133938OAI: oai:DiVA.org:umu-133938DiVA: diva2:1090094
Eksternt samarbeid
SCANIA CV AB
Fag / kurs
Examensarbete i teknisk fysik
Utdanningsprogram
Master of Science Programme in Engineering Physics
Veileder
Examiner
Tilgjengelig fra: 2017-04-25 Laget: 2017-04-21 Sist oppdatert: 2017-04-25bibliografisk kontrollert

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