Quote:
Originally Posted by Frank Lee
Those are two different situations. Completely different.
So I'd wager hood blisters don't really affect the flow upstream and downstream... so then what?
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Well the blister looks too narrow, but I think a gradual transition between the hood and the windshield would obviously allow air to flow smoothly and stay attached, rather than forming a high pressure bubble. I've seen people on this forum say that the bubble means aerodynamics in that spot don't matter, but it seems to me that it's the opposite.
Look the Aptera, Prius, and other aerodynamic cars. The hood is almost the same angle as the windshield so there probably is smooth continuous flow. The question how close to the same angle ideal you can get with a fairing that doesn't connect to the windshield.
Making the transition gradual with a curve has to help. It takes energy to force air to change direction, but less energy if you direct it gradually. Just look at intake pipes, sewage pipes, etc etc... Gradual curves, not right angle elbows.