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Pulser pump research from Loughborough University Answered

The pulser pump is the world's simplest water powered device. But the way it pumps water is pretty much unknown to the general public and research is lacking. Here is a paper from an engineering student in a university about it. (It is attached as a pdf file to this post).   Hopefully it fleshes out some of the science.  Regardless of who "invented" it,  it has been my "baby" for over 2 decades so it is nice to see it get some attention!     I was also told that the experiments may continue next year.  (With a different student)   Please check out the attached pdf,  I think mini pulser pumps can power "pallet gardens" but I do not have a stream here to try one.  (Going 3 ft deep under the water exit level is enough so really easy).   Brian



4 years ago

HOw if the blown water on above pictures used in ram pump???
I think it will more powerful blown and can be used in many purposes..

What's the benefit over the ram pump ? The water isn't flowing, except through the mechanism ? Is it more efficient than a ram pump ?

Both pulser pump and ram pump are on wikipedia. You could start your research there.

You're the specialist in such things, as the re-discoverer. Do you not actually know if its more efficient than the ram pump ?
Its a clever novelty for sure.

"efficiency" is a seriously misunderstood thing. A cheetah is more efficient at running than a cow but give it grass and no cows and it loses at running against the cow because it is dead. A pulser pump is easier to make and it uses the energy from half meter head of water. It could use the energy from a half tonne of water per second if it used a few large bore pipes lined up at the dam. Can a ram pump even use a half meter head? Or a half tonne of water per second, if it was available? And what would that cost to do? As I said, efficiency is totally mis-understood as is the concept of niches.

Yes, they can run on low heads, and can pump huge volumes - admittedly, at the price of two moving parts, but with a 60% efficiency. The pulsers cute, I'm not slagging it off, just putting it into perspective.

Rams cannot run on high volumes, steve.  Tell me of a ram that can run on a half meter head and  half a tonne of water per second and tell me what it costs to build it..    Ram pumps are very well understood and have been for a very long time. If ram pumps were so wonderful, they would be everywhere by now. I have never seen a ram at work in my life.  Last time I saw one it was in a museum and not working and it was in a group of about 4, broken metal hulks,  how come? Why aren't they everywhere?      You and others have this huge mental roadblock in you head.  This is the first half decent study of the pulser pump ever and it only came 25 years late. Because of closed minds like yours.  The mythical rams are cute, but  not worthy of the love-in that they get from the "efficiency" guys. You are measuring one of many parameters.  It is cow versus cheetah,  in 2 different fields of grass. Your ram cannot work in a big slow river but the pulser pump can.

Show me a pulser working with those parameters and I'll be impressed. Particularly as to move your mythical 1/2 tonne second from the parameters presented you have 50 cu.m/second passing through the pump.

Steve, why are you doing this? Why do you attack something that you have never seen before? Ram pumps are irrelevant to this thread. A ram pump generates serious vibration (that harm fishes hearing organs). And a big one is like a big piledriver (thats what the waterhammer does). In alluvial areas, you would need a lot of concrete to keep it from pile-driving itself downriver! And why are you being silly? I said half tonne per second as the power water to drive the pump. Where is there a ram pump that can take power from that quantity of water? Half tonne per second is "average" small river. One of the things the pump is for is pumping air. I don't know if you know but you are not allowed to use all the power from a river to remove water from the river. People would be pretty mad downstream with a dry riverbed. So the pulser pump can be used to compress air for fish farms, sewage treatment, Water cycling like my pallet gardens, etc. I expect low pressure air to be the main "product" from pulser pumps.

Why are you so sure I'm attacking ? I originally asked a perfectly straight forward question "How efficient is it ? " You then told me to "find out for myself", which I didn't think was a terribly nice thing to say, and so I did. according to the paper, the pulser is 1 % efficient. According to the literature, ram pumps are over 50% efficient. Whether that's a cow or a leopard is strangely irrelevant.

You seem to be incredibly touchy about comments on your baby that aren't "Wow that's amazing". Maybe others willl come along and say "Wow that's amazing" for you.

All I wanted to know was the headline efficiency, I wasn't going to make an issue of the resulting number.

Steve, have you made a ram pump? I have. Have you made a pulser pump? I have. I still have no idea why you brought up the ram pump in this thread. "All I wanted to know was the headline efficiency" . No, you wanted to shoot it down before anybody even began to try it! 20 year ago I got 6% to 10% efficiency pumping water with my 3rd prototype and over 30% compressing air. That was on a 300 litre per minute power flow falling half a meter. Regardless of your thoughts on efficiency, nothing else uses that type of flow and head in the world today. You put people off even trying it. That is hardly the type of thing instructables is supposed to encourage, is it? I am in ourwindowfarms.org and people try and approve my t-joint airlift pump and airlift pump in a bucket all over the world. And they approve and give them great reviews. Perhaps you could join and stop them too? I had a stalker on youtube telling people that airlift pumps cannot do more that about 2 to 1 lift to submergence ratio. (Because that was what the books said). Video shows 10 to 1.

"What's the benefit over the ram pump ? The water isn't flowing, except through the mechanism ? Is it more efficient than a ram pump ? "

....the rest is your paranoia....

So classy, Steve. You did read the first couple of pages of the guy's paper? (Because that answers your questions). Simplicity, price point, doesn't produce waterhammer, works in low head high volume streams, produces compressed air for jobs other than pumping water are some of the benefits. Lots of benefits actually. I do not have "paranoia". For every one of you who take offence to the idea of a pump with no moving parts, there are 10 happy windowfarmers who say "thankyou" or cite my work. Don't get me wrong, you do discourage people from trying the pump. Not much I can do about that. I put it on the internet as a 3rd world help project. In your own little way, you slow down further R&D that could help many people. Lets just say, I do not hold you in very high esteem.

What IS efficiency? Steve, And why do you want this stupid competition? Which is more efficient, a mountain bike or a car? A car or a boat? A tug or a freighter? A plane or a helicopter?