Tozza Mazza wrote:Very little info out there on the web, and pictures of Diffuser profiles are hard to come about.
Which shape is best for the aerodynamics of the diffuser, and why?
There was some info in the diffuser confusion thread, but it was so clogged up with babble and opinion I couldn't make sense of it.
So let's add something to this confusion, babble and opinion we've made in diffuser thread:
1. Basicaly what really counts at first approx is expansion ratio. As long as flows stay attached, all shapes/designs are born equally for uncompressible flows.But
2. There is huge build-up of boundary layer along this long, flat floor, which obviously didn't help to keep the flows attached to the diffuser ceiling. Sharp edge on the kink line helps to get rid of this. That's my understanding of how the weird shapes mentioned by scarbs work.
force: Low pressure on the flor/diffuser surface means thers is a force perpendicular
to ths surface. But we are looking (more or less, depending on the suspension geometry) only for the ground-facing part of this force - horizontal component is just drag, nothing more. So maybe it's better to have most acceleration/pressure drop on the parts of the car parallel to the ground, where all the force means down