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Venturi Design

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Will_D:
Any one have a design for a water jet Venturi?

The idea is a sort of pressure washer but without electricity!

I have access to our irrigation system. It is driven by a large pump and delivers about 6 bar and delivers through a 50 mm pipe network.

My idea is to make a venturi nozzle that will accelerate the water to get a high velocity effect as opposed to just using a crappy spray head.

I am aware that locomotive steam/water injectors use various curves in the design of the nozzles and restrictors etc.

Why do I want this? Its to power wash the mowers and other equipment in the club.

vtsteam:
Boy, it's been a long time since I read it, but there was a high pressure super water nozzle design somewhere it the Guy Lautard Machinist Bedside Reader series -- if I remember correctly it was a series of drilled concentric holes, not a typical smooth curve profile (as in a steam injector). Don't have them at hand at present, but maybe someone else does....?

vtsteam:
"Haralson Hose End", The Machinist's Second Bedside Reader.

naffsharpe (Nathan):
I recall that you gain pressure but at much lower flow? Therefore at HP/Low flow you can cut the muck off over a longer operator's time but at LP/higher flow you have a lower operator's time to achieve the same end result. Higher pressures need to be combined with higher flows to achieve your objective. Volume at moderate pressures (about 3 to 4 bar) should be your aim not volume at high pressures, the cost would be enormous and the losses unjustifiable. In practical terms HP/Low flow will give a needle jet (small area) and LP/High flow will give a wider jet (greater area) , the first will strip paint, the second will clear the muck. Nathan.
 

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