Testing Different Water Pump IMPELLERS - Which One PERFORMS THE BEST? [REMAKE]

I MEASURE PERFORMANCE NOT EFFICIENCY!!!

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[bowblade]

I work with water pumps so I feel obligated to point out that the reason the impellers had trouble starting up is because the reservoir inside the pump housing isn't filled with water all the way and has air in it. Water pumps are supposed to be "primed" before starting them which means filling the entire reservoir with water. Otherwise the impeller is trying to push air out when it's meant to push water. So this explains the difference in results after you did the second round

[felipenavas]

Today I learned that yellow color filament will give me the best performance for 3dp impeller

[stevenpolitte]

The strait blade impellers are high volume low head designs, the curved blades are lower volume higher head designs. That is why pump performance is graphed as a curve and prefers to operate within a specific duty cycle between open flow and deadhead (blocked discharge). You can simulate feet of head pressure (psi×2.31=) by throttling the discharge with a valve and monitoring psi with a gauge. Motor load must be figured into your pump's performance as well.
Great video and happy engineering!

[cda]

This isn't a positive displacement pump so it has to be below the water line to function best. Also it would be good to measure the head of each design with just a tall pipe and marking how far it can push water up. Good video though

[GamerCZ]

Yellow and grey impellers looks like they were design by glorius german engineering xD

[IncertusetNescio]

Being no engineer, I learned that 1) Some designs need priming before use or they choke on air for ages (but perform well) and 2) some designs are FAR better at self priming than others (but don't perform as well). I'm interested in knowing why, but that would likely involve some slow motion footage and possibly an animation per impeller. Cool stuff!

[anggorotriatmojo]

Well, this comparison video is stupid, the pumps are not well primed, there are leaks everywhere, and the battery will loose its juice the more you use it. I would prefer to use dc power supply that provides stable voltage and high current

[AzBachour]

You would have totally different results if the pumo was set on the bottom of the reservoir, gravity would prime the pump quickly

[rafaelpadilha]

Keep in mind that pump efficiency depends on motor power too, you should measure motor current and voltage during each impeller test. An impeller that moves water a little slower but consumes much less power is more efficient. Keep up the good work!

[atmk]

Mechanical engineer here, different shapes of impeller can have different performance curves (perform differently at different levels of back pressure) ideally each propeller should be tested at three different levels of back pressure or restriction in your nozzle and then all those points should be plotted and a curve can be fitted the compared against each other so that the best impeller can be chosen based on application.

This would explain the different performance in the two different tests as one test had a hose with a high restriction and one test had a nozzle with low restriction.

Anyway great work!

[gnramires]

An idea to make better seals is to put "grooves" into the border of your prints: make a few layers of valleys and peaks. This increases the surface area of sealing. Nice video!

[nealpowell]

The airfoil on the black impeller is travelling in reverse. That fix should see major improvements.

[krikukiks]

Not disclosing sponsor :angry:
Also images of the impellers on the chart would be nice for reference

[Amogha_M]

*Major Hardware* another YouTuber has same kind of content but he does with PC fans...

I really love your videos and make more designs and probably even make a page to submit viewer submitted impellers, print and test them!!!

[MidwestSirenProductions]

Wow was the previous installment of this really uploaded a year ago? Wow how time flies…I remember watching it like it was yesterday! I’m glad you came back to run this experiment again!

[JazzbLu]

I'm very glad that you did both high pressure low volume with the hose fill to 5L and high volume low pressure with pumping straight out. Very interesting the difference in results! Great video!

[Mrpurple]

Congratulations on getting your pump to prime.

[jdasfjjtdou]

I was just amazed by the purity of the experiment...
and incomparable embodiment of details...
and the attention to the sealing of the motor axis was especially amused ...

[sanjaypatil]

Appreciate the effort here ! Some more suggestions in addition to all the experienced folks here
1) all the leaks need to fixed to have more accurate results
2) why is the inlet pipe at a slant in the bucket ? It should continue to start from the bottom, but it should be horizontal all the way till the impeller. Even this isn't ideal as the water weight/pressure will reduce as the tub gets emptied. So I'd think we need a larger/wider tub so that height drop changes very little.
3) what improvement can we get if the inlet to the impeller isn't perpendicular rather inline with the impeller thrust ?

[ericgillespie]

My guess for those new objects is that they are for testing archimedes screw designs. :)