miuge
Veteran Member
Joined: March 2014
Posts: 199
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Post by miuge on Mar 14, 2014 13:54:09 GMT -5
Hi, Few tests done again, with and without jet nozzle and pressure regulator. Notes; jet nozzle didn't show any change to operation. Same temperatures, same problems. Removing the regulator helped starting the turbine (operated from the cylinder valve), nothing more. We still couldn't rise rpm so it would idle at positive pressure. No matter how slowly we try to open the valve, at some point rpm start to rise and it flames out... Too much air flow which extinguish the flame? It goes too lean? We have used warm water trick for the bottle otherwise it freezes very fast Last time we had time for only few runs opening the valve fast to get it run with boost. Today we continued the same way with different propane pressures. We got it run 2,5bar of boost which reduced TOT for over 100°C! Gauge was showing 670°C, which is good I think. Later we disassembled the turbo to see how's the heat pattern in flametube and check turbine blades. Heat pattern has come further to turbine inlet (previous picture was taken when idling without boost). Coolest spot nearest to charge pipe: Surprise surprise! Now I know why divided housing isn't the best, luckily turbine wheel has no damage at all I think we will make the housing single entry to avoid this kind of consequence:
As this project is only experimental with no time limit etc.. How about converting it to run Diesel?? Could it be the answer to running problems? -Miuge
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miuge
Veteran Member
Joined: March 2014
Posts: 199
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Post by miuge on Mar 13, 2014 5:16:29 GMT -5
Hi John! Injector has only radial holes in it. I don't remember exact specs of the turbo, but compressor is about 55/80mm and turbine 58/70mm, turbine A/R .82. 2,8bar/40psi is a gauge pressure, that turbo came from a serial production diesel which is run by 2,0bar/30psi boost. Compressor map: i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/kompurakartta_zps12cb64b6.jpgNow we have a jet nozzle in it, it's only a few millimeters coned (52mm out, turbine outlet 58mm), earlier we ran with a straight pipe with the same problems. Idle pressure might be the problem, we haven't run it to the pressure zone when starting..? It always flames out even if we slowly try to rise the rpm to the positive pressure and the same thing when lowering the gas pressure in full rpm.. But we'll try those tips, it would be nice to get it run properly! I've seen someone using propane tank upside down, is it safe? Would it change anything if we try it too? -Miuge
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miuge
Veteran Member
Joined: March 2014
Posts: 199
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Post by miuge on Mar 12, 2014 3:37:20 GMT -5
Hi guys! My first post in this forum, but I've been hanging around a while and that's pretty much where the idea came for our project Me and two friends of mine, also known as MagnusRacingTeam, started this turbojet project in January 2014. It's our first and none of our friends have done it neither.. In theory I (or we) was ready to build one, so we did. We had a pair of turbos at the shelf, smaller was 55/58mm T3 divided and the bigger 62/72mm T4 divided. We definitely wanted to mount the turbine in the bike frame (or something to drive with) so we bought one: An hour or two later we modified the frame a little: As you can see, we'd like to use a freepower turbine also. Combustor was designed with JetSpecs, known to be a decent program. Here's a few pics of the manufacturing: i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002126_zps5c8a9f3d.jpgi187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002132_zpsaf1a1ff7.jpgi187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002151_zps11a62af0.jpg2liter oil tank: i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002215_zpsf8c4759d.jpgFew type of LPG/Propane injectors, first we used was on the right and now we are running the one in the middle (6x 1.5mm holes): i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002239_zps8d90877f.jpgFirst time running: www.youtube.com/watch?v=IalA3214p8AInside the combustor: i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002246_zps0c38b1b4.jpgAfter first tests we were tired of the push-button-piezo ignition, so I ordered a battery piezo which works well indeed: i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002366_zps3cbf1855.jpgFor further testing we also needed a EGT gauge to keep an eye on TOT, here's our great sub 20€ gauge: i187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002363_zps09ce88f4.jpgi187.photobucket.com/albums/x281/mice325/Project%20Jatkettu/WP_002372_zpsc098e879.jpgThen, latest video from yesterday: Max. propane pressure was 4bar / 58psi Max. boost / P2 was 2,8bar / 40psi Max. TOT was 780°C / 1430°F And the problems... Turbine works well with no boost, we can throttle it to very minimal revs and rise it near the zone where it starts to create pressure. But then, if it peaks even a little boost it will shut down. Doesn't matter if we use the pressure regulator or the valve to adjust the revs it will shut down with boost. Only thing how we managed to keep it running with boost was open the valve fast, seen on the video above. Then, how could we possibly make it lower the revs... When closing the valve (when running on boost) it will shut down also.. Any tips? Thanks, Miuge
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