Re: My project build thread...

[Hoarp001]

Bit more work on the jet today. For my input I am using a 1inch BSP threaded fitting, threaded at one end, plain at the other. I put a smaller diameter hole in the end plug, and today we turned back a bit of the plastic on the threaded fitting so it will wedge in nicely.


Before we started working on it


Checking the fitting is true in the chuck. As its plastic, its quite hard to grip it without damaging it, but we got it true to about 40 microns.


Taking the diameter inside down to allow a 21.5mm socket to fit in which is what will connect this to my elbow for the water input.


Diameter and step are done.


The white sleeve is to support the elbow for the tangential water input.


Water input complete.


Tomorrow we will do the nozzle...

[Hoarp001]

Done a bit more work on the nozzle.

I sealed the water input in with Gold Label aquarium/pond sealant. Seemed like a good product for the job, its fish safe and it seems pretty sticky. I covered the fitting with the sealant, shoved it in the hole and cleaned off the excess. The white collar is pressed in.

I have got my big brass hose tail on now, and the hose. The hose ID is a bit small so it will need a bit more work to get it onto the tail properly. I will probably force it into the tail and then leave it on there permanently, and unscrew the tail to remove the hose from the jet.

I have installed the 90degree bend inside the jet, Its easy to rotate, remove and replace for other shapes etc so i should be able to experiment with the design.

[Gator]

WOW.... Impressive! I was shocked to see the 90 elbow - can wait to see the output from this.... 6" tube seems too small for my desired distance..

[Hoarp001]

The elbow was discussed here:

https://laminar.forumotion.com/t231-variation-on-the-tangential-water-input-design


Its like the tangential water input, just more robust...


Nozzle is being turned as we speak...

[Gator]

I think I agree with you on the elbow... that is saves the glue mess of most builds and no stress points. I went to get the parts to make a pass filter and ended up with the wrong size end caps. I do appreciate you taking us along with this build.... I need (want) 4 nozzles to pump into my pool on recirculated pool water. Not ready to give up on 6" pipe yet... Cant wait to see how much of a laminar stream you can get from this beauty!!

[Hoarp001]

Bit more done today....



The shape of the nozzle drawn out on the lathe



The water exit. The top is threaded and I have designed a nut that will screw on to hold it on to the plastic.



The nozzle sitting in the top plate, the threaded nut will screw over the top to hold the nozzle in. Its machined from stainless steel, with a half inch diameter opening. I made the edge as sharp as I could, although there is a tiny tiny rad right on the edge to give it a bit more strength.


Should be able to get the tube full of water tomorrow and jetting without all the straws. Who knows, maybe it will work OK without them...


Pete.

[Gator]

I'm in total awe.... That is incredible!! From what I've learned it will 100% work - the question is will project the desired distance (more than a few feet) and be laminar... I cant wait!!!

[John]

It's just not fair that you have such sophisticated tools! I'm totally jealous!

[Hoarp001]

Hah, just you wait till we start machining the LED block.

The nozzle should be done now, im just about to go to the machine shop to have a look at it...

[jetty]

Nice machining. Assuming the nozzle is following the profile on the drawing, and not being cut off, I'd be interested to see how laminar this stream is with that nozzle. My understanding from this forum is that where the nozzle touches the water, it needs to be razor sharp (generally a 45 degree bevel). I.E. the first thing and last thing the water touches is this razor sharp edge. The less metal that touches the stream, the less the outside of the stream is deformed and slowed down wrt to the inside of the stream.

Testing I've done indicates to me that this is true for the straw / foam type design of nozzle.

[Gator]

..I cant wait!!

[Hoarp001]

So ive just powered up the jet.


First pump was not powerful enough, jet was smooth but not very big. Second pump was so stupidly powerful i was spraying water like a firehose over the fence. I cut a hole in the hose just after it exits the pump to reduce the pressure which helped a lot. Any way, some teaser pics, a full report late.r








Who says a 6inch diameter jet cant squirt long distance ;-)

[liteglow]

impressive

video ??


btw: do you have any more pictures of the water exit on from the inside of the nozzle ?
It was not so easy from your pictures to see what was on the outside and inside.

I recommend that the inside (where water enter the output) should be FLAT ------------------------ and with no shapes !!
If there is any shapes and it will break up the laminar flow in the water stream.

But from your pictures the stream seems pretty awesome

cheers

[Gator]

That is killer!! That is what I was looking to do.... May be a tiny bit larger.... Very impressed. Of course... I feel a little foolish for dumping my 6" pipe in-favor of a 12"... So no straws? Looking forward to the details...!!!

[Hoarp001]

When the pump was running at full pelt, the water was thrown over the fence, the distance was at least 20ft, probably more. It was not laminar all the way along, but it does a 10ft long arc easily.

I was having a bit of an issue with pump jitter, and air pockets trapped at the top. I have already made a large pressure filter (1m tall) and tomorrow I will drill a shall hole in the plastic top to allow the water to slowly dribble out to act as an air bleed, which I will probably replace with something more elegant in the future.

At the moment, I have got the straws resting directly on the foam filter. This is because I have not yet done the mesh that holds the straws up. It seems to be working. My current setup is this:

Space 2 inches

2inch foam

Space 2inches

2inch foam
straws directly on foam

2 inch gap

nozzle.


Also the elbow made it worse. I could see bits of debris spinning around inside, it really did create a cyclone effect, however removing the elbow improved the stream a lot. I have now got a straight pipe shooting the water straight up into the foam.


The underside of the nozzle will be flush, however at the moment there is a bit of a step. I have allowed some space for a gasket or seal, and at the moment I do not have this, so there is a bit of a step (and a bit of a leak). it will be flush when its done, il try and get a pic tomorrow of how this looks.

[Hoarp001]

A rather crappy video for you. Will film some more tomorrow with the low pass filter in place.


Video

[liteglow]

impressive

The water arc is beautiful

[Hoarp001]

[Hoarp001]

By the way, there is no filter before the jet, so all the crap that sthe pump sucks up gets into the jet. I am going to put a filter on the pump soon.

[Gator]

I'm so jealous.... that is fantastic!!

[liteglow]

what a great build

Yes it`s bad that all the dirt goes into the nozzle.
Here is my filter that I used:




I used a nozzle tube, first a filter, inside another filter, and on the other end 2 tubes that goes into each pump.
Works pretty well.

[Hoarp001]

Just cleaned the jet out, im glad for the clear tube, as I could see how dirty it was. The pond is new and there is a lot of dust from all the rock and some mud and dirt that has fallen in during the building. I need to drain i and re fil it. The pump also has no filter on it, so any bits of debis gets sucked into it. its a very hefty pump, 7000Ltr/hr, and a lot of dirty got blown into the jet. The two white foam filters were dark brown, and there was dusty particles in the straws. Cleaned it all out, and put it back together again.

I have also stuffed a bit of filter foam in the input of hte pump to stop all the big bits going in.

This morning I drilled a 1mm diameter hole in the top to act as air bleed. It just gently dribbles for now, I will put a valve or a hose on it later.

As promised, a pic of the inside of the top lid showing the water hole.

[Gator]

so clean... Its just incredible... Yeah, I agree - having a clear pipe is a huge advantage!

[Hoarp001]

My next trick will be to inject food dye in to the tube and watch it flow to see where it goes rough. Doing this I hope to be able to see whats causing turbulence and experiment to remove it.

I have also started work on the lighting system today.


Pete.

[scrafy]

Hello Pete,

Awesome Nozzle, so perfect... If you do inject dye into the nozzle, please, please, take a video and post it here.

By the way, can you take pictures of the second half of the stream, where it hits the water. If possible a closeup with your hand or another object behind. My stream is a little turbulent there, I want to know if it's normal.

Thanks!

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