Vehicle & Technical > Discovery
HiClone air swirler
waveydavey:
I was going to comment on why a snorkel is not going to increase efficency but as usual RRB has done so much better than I ever can.
In simple terms though; a snorkel is not an extended induction system it is a long pipe with bends and resistance that simply leads to the induction system.
Pick up a long piece of pipe and breate through that; see if you find that easier than clear air.
thermidorthelobster:
If anybody knows how many l/min a TD5 sucks through at moderate revs, it would be very easy to work out what the max ram air effect of the snorkel is, ignoring the resistance of the tubing. In fact...
My Safari snorkel aperture has a cross-sectional area of 14x10cm. At 50mph the vehicle will be travelling at 22m/s. Therefore the snorkel opening will be sweeping through approximately 308,000 cubic cm of air every second (22,000 x 14 x 10cm). That's 308 litres of air a second.
If this is larger than the amount of air the engine's sucking in (and I suspect it will be...) then the snorkel will be pushing air down to the engine (ie, greater than atmospheric pressure inside the snorkel). This effect may be diminished by all the considerable losses in the tubing, but it won't be negated.
If it's smaller, then the engine would be sucking the air through the snorkel. (ie, less than atmospheric pressure in the snorkel.)
Now if RRB can calculate the losses in the tube we'll know exactly :D (that's the hard bit)
Feel free to point out any flaws in my logic or maths.
davidlandy:
that ssounds like the simplist way of working it out.
best to ignore things like windspeed, direction, resistance of the snorkle tube and the restrictions in there.
another thought , the air intake on a standard defender is on the side of the wing on a flat surface, (like the heater) would this have the opposite effect on the air intake and cause a lower air pressure , rather than a ram effect?
thermidorthelobster:
--- Quote from: "davidlandy" ---another thought , the air intake on a standard defender is on the side of the wing on a flat surface, (like the heater) would this have the opposite effect on the air intake and cause a lower air pressure , rather than a ram effect?
--- End quote ---
Generally, yes: it's the Bernoulli effect, which says that the pressure is lower in a moving fluid than a stationary one. It's why if you blow between two pieces of paper, they move together. So as the air blows past the heater intake, it will cause a low pressure area above the intake which will suck air out rather than ramming it in.
beast5680:
creating a vortex must have some effect :? i know it works for my toilet :lol: there,s no way half the stuff would go down without it :lol:
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version