Rear diffuser

[Def]

Originally Posted by Ghostdrifter

Def, If he uses strakes to induce turbulent flow wouldn't he be able to keep a divergence angle of 15 deg or greater w/o getting flow separation?

Strakes help form small vorticies in the sharp corners where they meet the diffuser floor, which does help pull air into the throat, but it doesn't really affect the separation angle much. It's more an efficiency booster, as you still have the same pressure gradient from the throat to the exit of the diffuser which will dictate how much you can turn the flow with the diffuser ramp.