Water-Cooled Jet Engine in Plastic

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Try this with a aquarium water chiller to keep temps even lower. Tomatoes are disgusting!

if your water cooling, intake goes on bottom and output ontop so your device totally fills before it can empty that way you dont end up with air pockets which dont cool anything.

As someone who works with liquid hydrocarbon on the daily, I just about had a heart attack when you said you were going to use it as coolant for a sparking fireball engine

Hey Joel, I just noticed that the electrodes are probably causing a lot of heat transfer to the resin. Maybe try a ceramic tube or slip coating to isolate that heat from the body part.

Now try this with liquid nitrogen and metal 3D print to keep temperatures even lower!

I can't believe you used liquid butane to cool a combustion chamber made of plastic, that was brilliant! 😂 P. S. : that keyboard is filthy!

Try to make a controller, this is what we actually use even in the early stages of jet engine builds. This helps a lot to understand what is going on inside the engine and by comparing this data with your design and materials used, you will know what is the problem and how exactly it can be solved. Helps to minimize the time you waste on prototypes and obviously the cost of materials used. the most basic one would include at least 2 thermal sensors (we use 2 at each stage of the engine for better results, but it's not really necessary for your needs), in your case 1 would be used inside the engine and the other one on the nozzle (just an example, you can play with it), AR sensor that would show the exact mixture (this will allow making it more efficient (by that I not only mean consumption but also temperatures (that are quite important in your case) (because the good mixture will decrease temperatures of combustion), air flow sensors (show the speeds of intake air etc.) and the last but not least is flow/consumption sensor (but it mostly used for liquid fuels, so not sure if it would be helpful for you. (If needed can help with code etc.) thank you for your videos.

Should use a ceramic spacer/O Ring to hold your diffuser to prevent the heat transfer from the metal to the resin/plastic

Hey integza, I had the same idea as you a couple years back and designed a water-cooled jet engine as well, but due to not having an SLA printer i was unable to give it a try. I designed it with a spiral water cooling and perfectly sized walls so that maximum cooling would be created. If you want I can send you the files if you are interested in trying out my design. Just let me know. :) Update: Seeing as you guys like this idea, I should also add that I also designed it with tangential air and fuel inlets as to provide an extra layer of protection by creating a boundary layer of insulating air. I saw this concept used before on a 3d printed rocket and it worked to some extent.

The butane coolant was a great idea. It was perfectly effective at producing content

Love it! I had recommended water cooling over a year back, so glad to finally see it attempted. Oh, and using the fuel to cool the engine is pretty much what NASA used to do, they cooled the bell nozzle (and I think the chamber) with the fuel before sending it into the chamber. Of course, they had a much higher flow and systems that could handle MUCH higher pressures, so it might not be a great idea to implement in plastic.

It would be interesting to watch it run with a infrared camera and see the efficiency in each design change.

Some Ideas: 1.) Run the engine “fuel rich” so that it can’t burn the plastic as well. 2.) Machine a Graphite Nozzle (and maybe other parts (combustion cylinder, diffuser disk) if that doesn’t work on it’s own) 3) As others have suggested, optimize the coolant loop (better path design, less bubbles, maybe even a faster pump / more volume; a bunch of cool 3d printed pump designs exist too, that could maybe be a video in of itself!) 4) Cool the water down with ice (and maybe even salt water to get it even colder, although I don’t know how that would effect the plastic, and what would happen if it gets in contact with the fire) 5.) Do the vortex cooling as well? (I don’t know much about this method, but it sounds like combining the two may be good!) 6.) Use Gaskets 7.) Use fine metal mesh as a flashback arrestor, or maybe even a commercial flashback arrestor like they use for Oxy-Fuel torches! 8.) Fancier Injector Design to Make Sure you are having things mix well That’s about all the ideas i have, and it was a great video as always!

Don't forget to vent your cooling loop (so that there are no air bubbles in the loop). That increases the cooling efficiency. Also you can try to utilize the fine internal structures you can create with SLA to create a unibody engine, eliminating the mount which will always be challenging to watercool. You can even do some flow simulations to find the form which best circulates the water without any hotspots. In your current solution the flow seems to not cover the whole engine.

I'm really glad you make these videos as you so, it's super fun and I learn a lot for both you and the comments. Cheers mate P.s don't use liquid butane to cool a fire!! That's really dangerous the amount that's going through!! You could try having it so that the water comes in the bottom and has to take a longer path around the jet, think of a spiral from front to back.. water flowing over every surface. Keep it up! P.P.S a radiator in an ice water bucket would be more effective for cooling then flammable liquids and gasses

You accomplished what I would think impossible. A Combustion Chamber made of plastic/tesin. I'm thoroughly impressed. Thank You for sharing this.

I think you should make a nice pair of safety glasses to protect your eyes from exploding plastic jet engines. After that you could look into cooling jet engines with something like liquid nitrogen.

if the resevoir is higher than the water jacket, it will vastly increase the efficiency of cooling because the air bubbles will be able to travel up to the res and leave the system. that frothy mix of water and air in the water jacket is really bad at conducting heat

A cool idea I could think off is trying out all your differnt engines and seeing which has the most thrust and some different challenges for your engines.