Has anyone played with designing a ventury nozzle for a pilot light shroud? Seems like a feasible way to lower turbulence at the ignition point, maybe allow for a tighter / longer flame. any thoughts?
-
Re: Ventury nozzle
Fri, May 16, 2008 - 12:10 AMWhen you go a-googling it's spelled "venturi". -
-
Re: Ventury nozzle
Fri, May 16, 2008 - 6:52 AMso spelling isn't my strong point. What are you going to do? Burn me!? HA, round eye make funny
Thanks ;) -
-
Re: Ventury nozzle
Sat, May 17, 2008 - 9:34 PM--Haha me! ;-) For more info on burners you might want to ask over at www.stanleysteamers.com where the subject has been studied in detail. Stanley steamers and other steam road vehicles seem to favor burners that have a jet of fuel that entrains air to achieve proper mixing and max heat production. Much has been written in various newsletters but they're a little hard to find..
-
-
-
Re: Ventury nozzle
Fri, May 16, 2008 - 1:00 PMI've worked on a bunch of projects that use venturi pilots. They are great given a few strangenesses.
1) they require pretty regular propane input. the oldschool stainless-steel-wool and a hose can operate with anything between .05 and 25 psi, and work. venturi pilots generally have a 3-10 psi window of operation, outside that, they are suck. Moral: you will need an adjustable regulator
2) they accumulate propane volume in the pipes, since they run at a higher pressure than other styles, they will take a while to burn down/out once you remove pressure. 10 minutes isn't too uncommon. Fire marshalls really don't like it when they tell you to shut it off, and you tell them to wait a few.
3) they are far more expensive or time consuming to make. If you make them, you will have to machine a few parts pretty precise. If you order them, a guy at burnzomatic will once again be confused.
-
Re: Ventury nozzle
Fri, May 16, 2008 - 4:12 PMnow I'm not talking about a venturi pilot light. First off I use a concentric pilot light with a needle valve built into the main valve and I don't need stainless wool
images.tribe.net/tribe/upl...551a348330
What I'm talking about is a pilot shroud, ventilated from the back side to reduce the turbulence of having a solid cup and more sleek. A little like a plumbers torch but without the focused flame -
-
Re: Ventury nozzle
Mon, May 19, 2008 - 10:07 AMsounds unstable in wind, your pilot getup, that is. Also, if you get shitty propane, you can get oil to ice up needle valves. I really discourage use of needle valves for pilots unless you have already used a regulator to drop the pressure.
if you want to use a venturi on a short-burst effect, it's not going to work very well. Venturi systems are a subset of jet pumps, the fuel through the middle creates a low pressure which draws air in the holes near the base, so you get a mixing of fuel and air. Short bursts create too much turbulence to achieve this well. Forced air is probably a better bet...
but sounds like you've got a plan, why don't you just make it and report back to us?
-
