2021 Mercedes S Class Aerodynamics Wind Tunnel Testing

With a cd figure from 0.22,1 the S-Class is one of the world's most aerodynamic cars, and especially so in the luxury saloon segment. Aerodynamic measures affecting the body, underbody and detachable parts allow a good showing in the wind tunnel and in real operation. Extensive airflow simulations were already carried out using high-performance computer clusters during an early development phase. A great deal of fine-tuning also went into the aeroacoustics. The previous generation of the S-Class already excelled with a very high level of interior noise comfort. The new model is even quieter.

Although the frontal area (A) of the new S-Class has increased slightly to 2.5 sq. m., the drag coefficient has been reduced even further compared to the preceding model. The product of cd and A is 0.56 sq. m., which is 200 sq. cm less than for the previous model after its last facelift.

One major focus of the aerodynamic measures was on the airflow in and around the front bumper. The space between the front wheel arch and the bumper is used as an air chamber. There are slits in the side walls of the recesses in the outer area of the bumper. These force air into the chambers and avoid interruption of the airflow ahead of the front wheels. At the same time some of the hot exhaust air from the engine compartment is directed into the air chamber. This is assisted by more effective sealing between the engine compartment and wheel arches. Each of the inlets ahead of the front wheels has a large exhaust air aperture preceded by a 3D suction spoiler. The mixture of cold and warm air is fed through these exhaust air apertures and ventilation slits to the insides of the front wheel arches. The resulting airflow ensures the best possible airflow along the underside of the vehicle and along the sides of the front wheel arches, and this also benefits thermal management in the engine compartment. In addition, the engine compartment panelling between the front wheels has been widened to reinforce this effect. Thanks to this improved thermal management, it has become possible to extend the rear engine compartment panelling even further and further reduce aerodynamic drag in comparison with a preceding model with a comparable engine.

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Видео 2021 Mercedes S Class Aerodynamics Wind Tunnel Testing канала DPCcars