stunthanger.com

Design => Engineering board => Topic started by: Dick Fowler on June 29, 2009, 06:47:03 PM

Title: Orifice Flow - Useful for Engine Venturi Work
Post by: Dick Fowler on June 29, 2009, 06:47:03 PM

http://www.jegasho.net/rotron%20pages/orifice%20flow%20calculation.htm

Title: Re: Orifice Flow - Useful for Engine Venturi Work
Post by: Scott Jenkins on September 01, 2009, 02:38:20 PM

Dick,

That looks good for getting the air into the venturi but what about getting the air past the needle valve/bar and into the engine. Does the reverse apply ?

Scott

Title: Re: Orifice Flow - Useful for Engine Venturi Work
Post by: Larry Cunningham on September 01, 2009, 07:53:32 PM

I think the useful information here is effects of various cross sectional shapes
on flow through a venturi. Calculating specifics yields a flow value which is useful to
someone, but not me.

As I recall, Frank Williams had a couple of good articles about venturis in Stunt News,
years ago. (That guy is a genius, of course.)

I'm guessing that turbulating flowed air could be useful in atomizing the fuel. One thing
we do with our stunt motors is to constrict air flow and operate it in an area nowhere
near maximum efficiency or power.

Or not.

For me, it's pretty much a hog looking at a wrist watch. Sorry. ???

L.

"Like dogs in a wheel, birds in a cage, or squirrels in a chain, ambitious men still
climb and climb, with great labor, and incessant anxiety, but never reach the top." -Robert Burton (1576-1640)