At the ship illutron, I have been doing some experiments with mixing air and propane using the venturi effect - like a bunsen burner.
This little guide should show you one way to make it work - What size nozzle to use etc.
Venturi / Bunsen Burner - How to mix propane & air for perfect burning
Basic principle of a venturi to mix air & propane (gas):
- Gas flows out of a small nozzle ( ~ Ø 0.83 mm )
- Small nozzle => High flow velocity (Makes sense)
- High flow velocity => Pressure drop (Makes sense, if you do the math
- Tip: Think of energy conservation - Higher speed = Higher Kinetic energy. Lower Potential energy = Lower pressure )
- Pressure drop => Sucks in air
To get the mix right, and the burn good, there is a close relationship between nozzle hole size and pipe size.
I will go into details about this in another post.
Nozzle size & Mixing Tube sizes that work - simple and quick
Nozzles come in different sizes
- Propane nozzle. Diameter 0.83 mm.
- Can be found inside the burner of gas stoves
- Mixing tube. Diameter: 15 mm. ( 1/2 inch pipe ) Length: 4-5 cm is fine
- Fittings - to fit it all together
- LPG (Commercial gas like propane)
- Gas Pressure Regulator (Regulating to +30 mBar - Standard kitchen pressure)
Notice how moving the mixing tube influences the flame. An air gap gives a better, hotter flame
Notice how disrupting the gas flow with your finger, will make the flame bite you...