Anyone have access to SAE publications?, underbody diffuser design papers Options

[TonyAKAVW]

I found an interesting literature review concerning underbody diffusers and there is a list of references, some of which are through the SAE.

Here's the article, and if anyone can get me electronic copies of the articles or knows of a way, I'd appreciate it.

http://www.tech.volvo.se/ivs/courses/kurs_...ero_rapp_sp.pdf


Thanks

Tony

[TonyAKAVW]

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Tony; is your radiator located in the front trunk? How large will you need for the venturi to move enough air? I guess a rear piece like you show under the engine would be questionable for an aircooled 6. I'm thinking maybe one that stops at the rear of the engine would still let the heat get sucked down.

My radiator will be located about 5-6 inches from the back of the rear firewall. I'm planning on having the radiator exhaust exit through a slot which goes across the firewall/floorpan seam. It will be about 5 inches wide and about 24 inches across. Air will be forced into the engine bay via a subtle air diverter or scoop and also be sucked through at speed using the venturi. At least thats the idea...

I'm really not sure how large the venturi needs to be. Since I don't have access to a wind tunnel or computational fluid dynamics software I have to hack it. I've thought about making some scale models and a fluid tank for testing. First though I want to research the topic and get some intuition about what to do.

In my mind, its what is after the rear of the engine that causes the most problems. The 914-6 GTs had no rear valence and I believe it was at least in part to reduce drag caused by the 'parachute effect' of trapped air in front of the rear bumper.

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Don't diffusers work more on Boyle's law, than the Bernoulli principle. More volume = lower pressure.

I believe Boyle's law is a 'static' gas law, whereas Bernoulli's principle has to do with fluid flow, that as pressure decreases, velocity increases.