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The goal is even distribution across the core. The expansion rate from inlet to core face is *marginally* similar to a K&W streamline duct, but the core is not perpendicular to the inlet, nor is it centered on the inlet (cowling/engine hardware restraints). The left edge of the core is actually inside the imaginary cylinder extending aft from the inlet, & the right & bottom edges are several inches outside the 'cylinder', with the core is at a significant angle to the streamline, as well. Because of this, the duct has to turn sharply left and down (when viewed from the front) to find the edges of the core. The turns are far too tight for the air to make the turns without some help. So I decided to build the duct with horizontal & vertical turning vanes that divide the duct into 4 sections, kinda like a 'multicellular sectoral horn' speaker.
The pics are not intended to say 'do it this way'; they just say 'this is what I'm trying'. :-)
Charlie
On 08/31/2013 02:54 PM, Scott Emery wrote:
So the 'turning vanes' are to make sure inlet velocity is converted to pressure?
Or do they spread out the airflow so it flows thru the whole cooler, not just one round spot in the middle?
Sent from my iPhone
On Aug 31, 2013, at 12:09 PM, Charlie England <ceengland7@gmail.com> wrote:
Well, that's how long it's been since I made any progress on it; I forgot the pun in the original email.
Tracy got it right. This will hopefully be the diffuser for my oil cooler. It will mount in the left nostril similar to Tracy's 20B 3rotor setup. Same core, with ~10"x10" face. If it 'almost cools' a 3 rotor, it should be fine on a 2 rotor. The radiator is still on the right side with an extreme wedge style diffuser. I found that I had to use a turning vane in it, to get even flow through the core. The turns are even more extreme with the oil cooler (much shorter diffuser), so I decided to include the turning vanes from the git-go (Southernism). Still a few more steps to go before I can check the flow, but I'll post a video of the flow once it's completed.
Charlie
On 08/31/2013 11:40 AM, Tracy wrote:
That might not be a bad idea to implement steering vanes in case diffuser flaws cause separation!
Tracy
Sent from my iPad
On Aug 31, 2013, at 11:22, Charlie E <ceengland7@gmail.com> wrote:
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