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A diffuser is a contoured piece of the car’s rear that enhances the aerodynamic qualities of the vehicle by smoothing the transition between the fast airflow beneath the vehicle and the considerably slower freestream airflow of the surrounding environment.
In order to prevent excessive flow separation and drag, it creates a gap for the underbody airflow to decelerate and expand (in volume as density is assumed to be constant at the speeds that automobiles move). This is accomplished by creating some “wake infill” or, more precisely, pressure recovery. In order to produce downforce, the diffuser itself accelerates the flow in front of it.
When a diffuser is utilised, air from the front of the automobile enters the underbody, accelerates, and lowers pressure. The transition between the diffuser and flat bottom has a suction peak. The diffuser’s throat is the transitional area where there is often the lowest pressure.
The diffuser then reduces drag on the automobile while easing this high-velocity air back to normal velocity and filling in the space underneath the vehicle. This makes the entire underbody a more effective downforce creating mechanism.
A rear diffuser is often mounted in the back portion of a car’s underbody. It functions by quickening the wind velocity under the automobile. The air flow is identical to the ambient pressure and speed at the diffuser exit station.
The air flow will have a much higher speed at the diffuser inlet and, therefore, beneath the entire automobile underbody since the design of the diffuser is extending the rear region and the exit area is far larger than the entrance.
The Global Active Rear Diffuser market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
Porsche patented the Active Rear Diffuser, which will probably be utilised in EVs in the future.
Porsche is attempting to patent a novel piece of active diffuser technology. Currently, active deploying rear wings that sit beneath the car are available on the majority of Porsche-badged performance vehicles.
Porsche has now developed a new diffuser that will fit beneath the bumper. Due to its concave interior form, this aero element conveniently merges into the body when not in use. The company may also use the technology in upcoming EVs.
This technological patent was first submitted by Porsche, and it was later made public by the USPTO. In order to adjust the vehicle’s aerodynamics, the diffuser successfully directed air down the extended length of the tail when it was in operation.
The business also intends to add several flaps along the back of the car, some of which might operate independently. “The embodiment that runs across the whole width of the rear end may be applied, for example, in cars without exhaust-gas tailpipes, such as electric vehicles,” the company’s application continues.
