Browse Publications Technical Papers 2018-01-9178

Aerodynamic Analysis of Cooling Airflow for Different Front-End Designs of a Heavy-Duty Cab-over-Engine Truck 2018-01-9178

This paper deals with the analysis of cooling airflow for two different front-end designs of a heavy truck. The first design is a cab-over-engine (COE) cab; the second is a Soft Nose (SN) cab, which in this case is basically an elongation of the grille area of the COE cab to obtain a smoother shape of the cab. The SN model used in this investigation was extended 200mm from the COE front. Computational Fluid Dynamics (CFD) was used as the tool for examining the aerodynamic properties of the vehicle models. The configurations were evaluated both with inactive and active heat exchangers, in order to examine the effect of heating the air on the drag co-efficient and also to determine the cooling capacity of the different models. A sub- study was performed where different opening percentages of the grille area was investigated to determine the minimum percentage opening that would be needed to achieve a radiator Top Tank Temperature (TTT) value below a target limit of 100°C. The results show that there was potential for drag reductions for the SN model used. The cooling airflow was different for the COE and SN models; as a consequence of the longer distance between the grille and cooling package, less air entered the cooling module for the SN model. A large portion of the airflow entering the grille leaked around the cooling module for the SN model. Also, following on from the reduced airflow through the cooling package, the radiator Top Tank Temperature (TTT) values were considerably increased with the SN model. It was also shown that for the specific driving condition simulated here, an opening of 17.5% of the grille area was required to ensure sufficient cooling capacity.


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