AeroSpeedGel by NAQI

Concept


AERO SPEED GEL CONCEPT

Nikolaas Van Riet*, Greet Claes**
* Cycling aerodynamics research & development consultant
** Head of research and development, NAQI

III. AERO SPEED GEL CONCEPT

The NAQI Aero Speed Gel concept works similarly as the dimples in a golf ball. By roughening the surface of a round object, turbulence can be increased in the boundary layer. This increased turbulence causes the flow to become more resistant against separation. This resistance to separation makes the flow stick to the surface longer and thereby creating a smaller wake behind the object. This smaller area of low pressure behind the object and thus lower aerodynamic drag.

Figure shows the aerodynamic aspects of a golf ball with dimples and a golf ball without dimples.

 

By adding vortex generators to a gel, that is applied to arms and/or legs of a cyclist, these special particles aid in the generation of turbulence in the boundary layers and therefor the postponement of flow separation behind the arms and/or legs of the cyclist. Figure 2 shows the flow separation around a spherical object with two different separation points, marked by the red arrows

Figure shows the flow separation around a spherical object with early separation on the left and late separation on the right side.
Source: https://plus.maths.org/content/fly-walks-round-football.