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Post by lockheedfartin on Sept 4, 2024 20:34:10 GMT -5
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Post by racket on Sept 4, 2024 22:38:37 GMT -5
Hi
The turbine scroll A/R at 0.63 is "tight" and will restrict your comps flow rate , possibly back to ~35 lbs/min at 2.5 PR - 22 psi gauge , so a max fuel flow of ~35 lbs/hr - ~5 USG /hr , maybe ~1.5 USG /hr at idle
Cheers
John
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Post by lockheedfartin on Sept 5, 2024 16:34:22 GMT -5
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Post by racket on Sept 5, 2024 16:57:12 GMT -5
It won't produce more than a couple of pounds of thrust , better to use your time and energy making a decent sized engine
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Post by lockheedfartin on Sept 11, 2024 12:24:28 GMT -5
It won't produce more than a couple of pounds of thrust , better to use your time and energy making a decent sized engine do you have any idea on about how much thrust my first turbo i listed would produce, given a jet nozzle would be on there? |
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Post by racket on Sept 11, 2024 16:36:52 GMT -5
Maybe 20-25 lbs of thrust
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Post by lockheedfartin on Sept 12, 2024 11:18:20 GMT -5
Maybe 20-25 lbs of thrust cool thanks. www.mcmaster.com/1079K17/also, i want to put this sight glass on the end cap to my flame tube (where the fuel and sparkplug will be). it is only rated for 500F, do you think that side will get that hot? the actual combustion will be happening about 4 inches away from the end plate. i found one rated for 1500F but the price jumps from like 50$ to 400$. |
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Sept 12, 2024 15:21:02 GMT -5
My guess is that the cap will not get that hot if the flame tube is properly designed But why would you do that You wont see anything or maybe just a faint glow reflection
Consider this: You re planning to put a sight glass on the external shell of the combustion chamber. You will only get a nice view of a dark chamber containing the actual flame tube and maybe some glimpse of a flame trough the flame tube holes.. waste of time and money. If you cant picture what Im saying go you should review of a combustion chamber is constructed.
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Post by lockheedfartin on Sept 12, 2024 21:20:53 GMT -5
My guess is that the cap will not get that hot if the flame tube is properly designed But why would you do that You wont see anything or maybe just a faint glow reflection Consider this: You re planning to put a sight glass on the external shell of the combustion chamber. You will only get a nice view of a dark chamber containing the actual flame tube and maybe some glimpse of a flame trough the flame tube holes.. waste of time and money. If you cant picture what Im saying go you should review of a combustion chamber is constructed. no, it would be right above the kerosene fuel stem, still inside the flame tube. it will not be on the outside of the flame tube, so i should be able to see the whole flame pretty well. for 50$ i thought it would be pretty badass to see it as it’s running (i’m a pyro so something about seeing the flame as it produces the thrust and noise appeals to me for some reason lol). i just wanted any ideas on if it would exceed the rated temp, wasn’t looking for opinions or design suggestions. |
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Sept 13, 2024 5:09:53 GMT -5
Can you post a quick drawing of your flame tube and where you want to install that sighting glass
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Post by lockheedfartin on Sept 13, 2024 7:10:02 GMT -5
Can you post a quick drawing of your flame tube and where you want to install that sighting glass so that’s the flame tube with the welded on end cap that would slide into the combustion chamber holder and bolt in. it is in between both flame tube walls right above the fuel stem. fuel stem is approximately 100mm long |
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Sept 13, 2024 9:16:52 GMT -5
What is that cone at the end of the fuel stem ? Is it the end cap of the flame tube ? Wont it block the view? Or is it just a representation of the spray pattern ? Theses are picture of the "head" half of my combustion and the swirl vanes You might see why from my point of view there's not much to see from an outside port But i understand you have a different design. Temperatur wise.. While the flame shouldn't touch this area I would worry about radiating heat so go with the best grade   |
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Post by lockheedfartin on Sept 13, 2024 9:26:51 GMT -5
What is that cone at the end of the fuel stem ? Is it the end cap of the flame tube ? Wont it block the view? Or is it just a representation of the spray pattern ? Theses are picture of the "head" half of my combustion and the swirl vanes You might see why from my point of view there's not much to see from an outside port But i understand you have a different design. Temperatur wise.. While the flame shouldn't touch this area I would worry about radiating heat so go with the best grade oh wow yeah your design is definitely more complex than mine. and yeah that was just my shitty depiction of a spray pattern lol. youre probably right, ill most likely just end up not going with the sight glass at all. maybe once its up and running ill hit it with an IR thermometer and if that area isnt over 500F maybe ill put it in afterward |
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Post by finiteparts on Sept 13, 2024 10:42:17 GMT -5
It is definitely interesting to be able to "look" into the combustor casing when the engine is running. I did that on one of my engines 10 years ago and posted a video where you can see the flames pulsing in and out of the primary holes when it blows out and then reignites and get the compressor to mildly surge. Here is the link: youtu.be/CjEIpqEvrhc?feature=sharedThe window was just a thick piece of fused quartz that is positioned just like you have drawn yours and is looking into the primary swirler, which is looking a bit rough, just because I only had access to a stick welder back when the engine was first built 20 years ago... youtu.be/Ucfx27ak0FE?feature=shared...still worked like a champ though! Richard, That spark plug immersion seems a bit risky...is that design intent or just a test fitting? Looks like a good source of high iron emissions...ha! - Chris |
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Sept 13, 2024 10:48:00 GMT -5
If you want to see what it might be like inside your combustor you can run it on a bench, without the turbo, feeding fuel from whatever device you going to use and air from a powerful leaf blower having its outlet adapted to your combustor inlet. You ll have a nice view looking at the outlet end of the combustor. This set up might help you in resolving ignition issues ( igniter placement etc) But keep in mind that the leaf blower will deliver little flow and pressure vs the turbo so you wont be able to feed as much fuel as your engine might burn, and the reality will be different from what you see. Still its pretty exciting to do.  Screen shot of a test I did tweaking my ignition system. Outer shell is just stove pipe and tape... |
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