Presentation on theme: "AERODYNAMICS. To develop a car with high aero performance both for limited grip conditions (cornering) and where power is required to reach high speeds."— Presentation transcript:
To develop a car with high aero performance both for limited grip conditions (cornering) and where power is required to reach high speeds (straight) AERODYNAMICS TARGET ACHIEVEMENT Maximizing downforce to improve grip performance means making the drag coefficient worse, penalizing high speed Thanks to active aero devices the car has two different configurations: ▫ HIGH DOWNFORCE where more grip is required ▫ LOW DRAG for high speeds Diffuser expansion and cooling flow management for drag reduction Active device in the splitter to get the optimum aero balance in every driving condition Front mobile devices adjusted by air pressure
0.25 Velocity magnitude [dimension-less] ACTIVE AERO DEVICES FRONT ACTIVE DEVICES The vertical guide vanes open reducing the volume of air entering the radiators thereby cutting drag.
0.25 Velocity magnitude [dimension-less] FRONT ACTIVE DEVICES The horizontal flap opens channelling air to the underbody, increasing the load over the rear axle and restoring the right aero load distribution ACTIVE AERO DEVICES
Velocity contour centre-line plane 458 Speciale 458 Italia 0.25 Velocity magnitude [dimension-less] Pressure coefficient [dimension-less] The dam and the hump below the car reduce pressure at the front: the dam creates a separation zone in the air flow to the rear of the leading edge of the front splitter, while the hump does the same at the start of the flat underbody. FRONT UNDERBODY
Pressure coefficient [dimension-less] Speciale 458 Italia 35mm The profile of the rear spoiler has been raised and shifted back by 35mm with the dual purpose of: - increasing the high-pressure area of the rear upper body NEW REAR-END DESIGN
458 Speciale 458 Italia 35mm Pressure coefficient [dimension-less] The rear spoiler has been raised and shifted back by 35mm with the dual purpose of: - increasing the high pressure area of the rear upper body - increasing the underbody suction performance Underbody suction performance increased thanks to new diffuser shape with increased expansions NEW REAR END DESIGN
Pressure coefficient [dimension-less] Velocity magnitude [dimension-less] ACTIVE AERO DEVICES Flaps in the lowered position reduce drag and downforce over the rear axle Active rear flaps manage the diffuser expansion to increase downforce or reduce drag depending on driving conditions.
COOLING SYSTEM 0.25 Velocity magnitude [dimension-less] COOLING SYSTEM Increasing engine power and grip, we increased the need to dissipate engine heat. The cooling performance has been increased without changing the radiator but increasing cooling air flow using auxiliary air vents in the bonnet (1) and wheelarch (2)
COOLING SYSTEM …. TURNING VANE Turning vanes are used to exploit sill covers and lateral part of the front bumper for vertical load generation FRONT UNDERBODY New underbody designed to increase vertical load over the front axle according to the increased performance of the rear end FRONT ACTIVE DEVICES Flaps moved by air pressure for drag reduction and aero distribution management NEW REAR END DESIGN Integrated design: diffuser shape developed according to increased spoiler performance. Drag Reduction System: diffuser with active flaps for expansion management COOLING SYSTEM Increased cooling air flow using auxiliary air vents in the bonnet and wheelarches EFFICIENCY = 1.5 Cd = Cl = 0.530