Engineers dedicate extensive hours to wind tunnel testing and computer-aided design to optimize airflow around vehicles, especially high-performance models like the Acura NSX. However, how can one evaluate the efficacy of these engineering efforts in a real-world setting, outside of controlled environments?
Jason Fenske from Engineering Explained effectively demonstrates the aerodynamics of the NSX using methods simpler than wind tunnel testing. While a smoke grenade does not produce the precise lines of smoke achieved in a tunnel, it is useful in following a lead car to observe airflow patterns surrounding it.
As anticipated, the front grille pulls air into the vehicle through its main radiator for cooling purposes. This air then exits via hood vents, flowing under the side mirrors and along the car’s sides, which helps generate downforce. After cooling in the external environment, the air re-enters through channels located in front of the rear wheels, passing through the intercoolers before escaping above the rear diffuser.
Some air directed through the front of the NSX is utilized for cooling the front brakes. This typically results in turbulence around the wheel wells. However, additional air enters through the front corner scoops, creating a cushion of clean airflow that maintains a smooth air stream around the front wheels. At the rear, a hollow subframe channels air from beneath the car, distributing it onto the brakes to aid in cooling.
Another approach to thoroughly illustrate the aerodynamics surrounding the NSX involves the application of flow visualization paint. Formula 1 teams often use this technique during test sessions to optimize aerodynamic configurations tailored to specific tracks and driver preferences. This colored water adheres to the car’s surface, marking the path the air takes after a dynamic drive. Straight lines indicate smooth airflow, while swirls signify turbulence. While some turbulence can be acceptable, smooth airflow is crucial in many areas, particularly where it must flow seamlessly over the car’s body.
