DIY Acetylene in DIY Pulse Jet
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- Опубліковано 23 лип 2024
- This is kind of a Part 2a video continuing from Part 2 about my homemade pulse jet.
Here I manage to get it running at low power on homemade acetylene.
The information about the acetylene generator was obtained mainly from a 1918 publication 'Mechanics Of The Household' by E. S. Keene.
I am not suggesting that anyone tries to do the same - it worked OK for me but it could have gone wrong.
Part 1 can be seen here: • DIY Pulse Jet Design, ...
Part 2 can be seen here: • DIY Pulse Jet Part 2 -...
Glad to see the upload of your next video - means you did not blow yourself up with the acetylene.
Thank you. It was not a very exciting video though.
I wonder where Part 3 is...?
Get it hot and inject some waste Veg oil. that would be a breakthough if you could get it to run on that. The thing to keep in mind will be HEAT. you need to vaporise it so get the jet red hot then inject it and should work fine.
I have got some hydraulic brake pipe to wrap around the hottest part of the jet. I will then feed it in through the spark plug hole. Not sure what kind of nozzle or injector to use - will just need to experiment. Probably easiest to pressurise some sort of fuel vessel with compressed air to drive it in. Will get it worked out and start experimenting. MAP gas for the idle should be way hot enough which could probably be turned off once up to temperature. 🙂
@@mrpingen Do not vaporise the oil in the tube. It will leave residue and quickly block.
I would not worry about pre heating. It is not going to make any difference in a hot combustion chamber and is a fallacy spread by people with not experience with oil burning.
A small caravan Diaphram water pump would be idea. You could also use a needle valve to regulate the oil flow. once the oil is burning you definitely won't need any gas. The energy content of the oil is much higher.
You may find the oil sparks a lot as the carbon particles burn and are ejected.
@@glumpy10 I will save the pipe coil for the methanol and try directly application of the oil. I have a few different things to try.
@@mrpingen methanol phase changes ( Boils at about 65-70C so you may be putting the meth in as a gas anyway.
there is also a thing with LPG/ Propaaane in that if you get it hot, it disassociates and burns hotter. I have done this and you really need steel tube like brake line glowing red hot but it definitely makes a difference to the heat produced.
As long as the oil goes in the jet when and where it is red hot, I think it will work. metering it may be the trick but once going, you could be able to run as long as the fuel lasts which on 5L or so could be a goog long time.
A fuel preheater system would be a tremendous help... Even the old kerosene lamps rely on primitive systems of fuel vaporization through latent heat of the lamp itself... Veg oil or any diesel substitute really benefits from heat in regards to viscosity lowering, which logically, allows for much finer vaporization or more effective, as the fuel itself has greatly reduced tendency to be spat out in droplets, but rather in a form of mist(if the nozzle is appropriate)... Just getting the jet burner red hot wont really affect the temperature of the fuel coming into it, sure, it will heat up the delivery pipe somewhat and thus reduce fuel visc, but i would try coiling the fuel pipe in a linear S configuration, bending it into a slight radius and affixing it with inox standoff clamps to the jet body... There the latent heat of the jet would radiate into the pipe, heating up a large section of it, increasing the fuel pressure, reducing its visc, and thus allowing the nozzle to blast the finest high pressure hot mist of fuel almost at its autoignition point(which doesnt matter in the pipe, as there is naught but the fuel in it, like with acetylene, thus no issue of actual self immolation or preemptive ignition as can happen in a car engine comb. chamber where there is air along with the fuel)...
Haggis is even more volatile than acetylene.
Please explain what you mean.
You had to make a diagram and measurements to be able to cut and assemble it. There are also mathematical models and computer algorithms to model and design engines like yours. It means knowing the pressures, densities, flow rates, temperatures, energies, reactions, ignition. Even if you are not doing that now, you might want to look at what you have now. Shapes and dimensions, materials, colors and temperatures from videos. Grams per second of fuel burned can convert to Joules/second of heat of combustion. Grams of fuel and grams of oxygen. You are using several ways of igniting. You might want to formalize that and test just ignition for various mixtures and flow rates. If you find others doing the same things and want to combine efforts, that can perhaps be speeded by shared modeling tools, common methods of measurements. Please start from SI units (metric) from the beginning. Sounds like work doesn't it. If you want to survive without too many explosions, perhaps effort and measurement and record keeping is worth it.
You might start with a simple rocket nozzle. But you might also check plasma jets where electric and magnetic fields will control timing and flow.
What you are doing is difficult. I have worked on problems for decades, which are slow mostly because the thing you want to control or understand is literally invisible, like air or gas, magnetic or gravitational fields. No one measures and you get "big" "small" "tiny" "faster" "red" and words that do not tell you precisely what to do next. Edison had his lab people try thousands of variations, now that can be done in the computer somewhat. Recommend you pay $20 a month and talk to OpenAI ChatGPT 4.0 about what you are trying to do. Be precise and ask about heats of combustion for various fuels. Diesel or gasoline or "cheap" fuel is better, if somewhat dangerous. Use safety measures. You might want to make smaller test rigs. But taking days or weeks to build things and test them and still not know what is happening, sucks. You might want to simply invest in learning how to calculate. At least try to talk to GPT Plus about it. Use your best language and expect it to make mistakes. One day those tools will know how to speak English (and some other languages) and know how to use computer software themselves. Engineering is 98% writing things down, measuring and calculating. Not just "try something and look at it". "Engineering design" begins when you share data with others.
I am not at all sure what you want to do. A pulsed oxygen fuel combustor makes noise, generates heat and SOUND and VIBRATION and some MOTION. You can record the sound and study it A tiny jet that is too small to see, and the fuel is invisible, you can RECORD with sensitive microphone(s) and view with Audacity software. A three axis gyro/accelerometer/magnetic sensor is cheaper now. But the cheapest sensors are cameras (remove IR filter) and microphones. I am trying to push you a bit. Acetylene from rocks is nice to know, you did that. But what are you wanting to do? Make noise? Then record it and look at the waveforms, do some calculations. Get others to try to replicate. Study second order differential equations, "resonant circuits", "computational fluid dynamics" (ask GPT to explain that to you). Ten hours of study is worth 100 hours of "just making things" and sometimes "just making things" is worth millions of hours of looking to see if anyone else has already done something. If they did not measure and share their data, you might never be able to know if you are working on the same thing.
On Bing there are 10.4 Million entry points for "pulse jet". You might want to try fuel injection, and explosions, in a simple tube, or air, rather than using more or less uncontrollable flows inside rigid bodies. Get the timing and concentrations from controlled fuel amounts and oxygen, rather than try to fiddle with a big flow and make something happen. The sound, if you use a USB 96000 samples per second microphone record has fairly precise timing and results. Accelerometers are actually less sensitive than gyros, you just have to learn to think in tiny rotations, rather than tiny displacements. The first derivative of grams/second is grams/second^2. That is an "accelerating variable" and will have a force. Grams/centimeter^2 is the second spatial derivative and it will have an acoustic force and resonant frequency and velocity and shock fronts connected. GPT can answer hard questions better then simple ones. Because when you are certain, it speeds the process. So work from things you are certain of. Find those from tiny things you notice. Share your measurement. Record and compare your recordings. Sound is closer to force and power. Laser intensity is Watts/Meter^2.
Please be careful. Try to decide what it is you want to do. Is it noise, or heat, light or quiet acceleration?
Richard Collins, The Internet Foundation
Is this my first AI generated comment?
Thanks "Richard". 🙂