Dad
Low speed wind tunnels don't blow they suck. That puts the prop wash
down stream from the model. Most are re entrant also. The air passes through
the test section into an expanding diffuser, through the fan, makes four 90
degree turns with flow straightening vanes, through a converging cone back
to the test section. Some are single pass though but they all suck.
Jim in Palmdale
> you guys talking about different things have helped me greatly on this
> project! building a tunnel 6x6' with 10' from fan to front edge of
tire.it's
> for a motor cycle of course but i'm learning and it would be of a great
help
> in my efforts. i beleive ,i have been playing with different types of fans
> and i may end up going with a prop from an airplane.i have many questions
> but here goes...........what minimum mph would even on a lesser scale show
> me some usable data?i hope 10' from fan to front edge of wheel is enough
> for air to stableize..is it? if not would it still give me some usable
> data?i am us tuffting/smoke wand and possibly a colored liquid.also a mph
> gauge for baseline /wish i had a manometer to measure high/low airdensity
to
> help but still hunting and hopeing it's one i can afford.any more
equipment
> needed? am i missing something?also have a window on the side and top of
> tunnel centered up and pointing straight down with mirrors on the back
> side.(all flush and smooth inside of course!)i pl;an on mounting
cam-corders
> on the side and top so i can see what's going on.........if nothing else
> working on my tuck ,etc..any thoughts?last but not least on the top of my
> mind.................does it matter if it is sq. or round inside? i'm
> planning on making it round as it's less air to move and more
speed....aero
> discussions here are very interesting.......and informative.i'd like to be
> able to test and see if what i'm doing is on the right track or making me
> slower?.thank you one and all.ol dad #566b
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