Nu till mitt lilla problem,han tog även fram blad/fjäderstålet till ventilerna och nu är det så att han dog förra året och jag kan inte får tag på materialet längre.
Så jag tänkte att du kanske i utbyte mot pengar kunde skicka ner lite till mig. Om du nu har några bitar över då.
Jag skulle behöva minst 4st bitar på 100x200mm. Jag är inte riktigt säker på tjockleken men jag skulle gissa på ca 0,3mm eller är jag ute och cyklar nu?
använder ni någon special ligerataluminium till era ventilsäten?
Jag heter Daniel Lövgren. Jo, det är så att jag håller på att bygga min tredje pulsjet motor som kommer bli en större sak( ca 100kg i tryck). Min första motor var en ventillös liten sak som jag och min far byggde för ca 5 år sedan. Nummer två var däremot en ventilerad på ca 5kg i tryck. Jag fick hjälp av en lokal pulsjet gubbe med ritningen och ventilerna.
@Anders811017 Because your turbine is a radial inflow type, you will always have higher EGT than an axial flow turbine engine with the same fuel flow and power output. This is caused in part by the fact that the combustion gases impinge on the turbine at a much sharper angle and thus produce more friction. A jetpipe just makes it worse. A good side effect though is higher turbine torque. This kind of engine would be ideal for a turboprop or turboshaft, not a thrust producer.
@Anders811017 To elaborate on the heat issue. The fact that the air has to redirect so much is what i mean by friction. Its changing 90 degrees abruptly. Now in a axial type there is the nozzle guide vanes that also make an extreme change in exhaust flow but not a sudden 90 degree one. I know that sounds dumb considering the nozzle guide vanes are 45 degree's offset from the turbines which could be up to 45 degree's opposite but I don't make the laws of physics.
@Anders811017 This type of turbine engine(radial inflow) also has the highest spool speed of all types. This is another reason they are used in turboprops and turboshafts. These tiny high spooling engines create huge torque when geared down. A Chinook engine is not very big at all but it has very high spool speeds. And so it can make over 4500hp despite how small it is. Your engine could most likely in a turboshaft/prop role make easily 70hp.
@superskullmaster This engine will actually be the core of a turboshaft engine, I will use a 4th stage axial turbine wheel from a Allison 250C20 gas turbine as the power turbine and make a 6:1 gearbox to get the revs down from 30.000 to 5.000rpm.
The engine will be put in a tubilar chrome moly bike frame I am building at the moment and should put out close to 150hp if everything is done correctly, will have to run a TOT of 750°C to reach that sort of performance.
@superskullmaster The reason I wait for the fuel before I spool the engine up is that the fuel line was completely empty after overhaul so I had to fill it up for a couple of seconds.
I use propane for preheating/ignition of the diesel vapour and if I spool her up too early the propane flame is put out. Some more practice and flame-less starts should be possible.
Nu till mitt lilla problem,han tog även fram blad/fjäderstålet till ventilerna och nu är det så att han dog förra året och jag kan inte får tag på materialet längre.
Så jag tänkte att du kanske i utbyte mot pengar kunde skicka ner lite till mig. Om du nu har några bitar över då.
Jag skulle behöva minst 4st bitar på 100x200mm. Jag är inte riktigt säker på tjockleken men jag skulle gissa på ca 0,3mm eller är jag ute och cyklar nu?
använder ni någon special ligerataluminium till era ventilsäten?
rcflygare 2 months ago
Äh, jag testar här med.
Hej
Jag heter Daniel Lövgren. Jo, det är så att jag håller på att bygga min tredje pulsjet motor som kommer bli en större sak( ca 100kg i tryck). Min första motor var en ventillös liten sak som jag och min far byggde för ca 5 år sedan. Nummer två var däremot en ventilerad på ca 5kg i tryck. Jag fick hjälp av en lokal pulsjet gubbe med ritningen och ventilerna.
rcflygare 2 months ago
Holy shit you built that? Awesomee :D
sladeoss 3 months ago
Fan va fint den starta o gick den här gången =)
ulflj 3 months ago in playlist More videos from Anders811017
@ulflj Jo, nu börjar jag få lite snits på startandet. En större lufttub gjorde sitt till också.
Anders811017 3 months ago
Ha sweet run! The engine's running a bit hot at 720 C you said, are you going to open up the exhaust before your next run?
1metiz 3 months ago
@1metiz I might even remove the jet pipe completely to see how hot it runs without any restrictions.
Anders811017 3 months ago
@Anders811017 Because your turbine is a radial inflow type, you will always have higher EGT than an axial flow turbine engine with the same fuel flow and power output. This is caused in part by the fact that the combustion gases impinge on the turbine at a much sharper angle and thus produce more friction. A jetpipe just makes it worse. A good side effect though is higher turbine torque. This kind of engine would be ideal for a turboprop or turboshaft, not a thrust producer.
superskullmaster 2 weeks ago
@Anders811017 To elaborate on the heat issue. The fact that the air has to redirect so much is what i mean by friction. Its changing 90 degrees abruptly. Now in a axial type there is the nozzle guide vanes that also make an extreme change in exhaust flow but not a sudden 90 degree one. I know that sounds dumb considering the nozzle guide vanes are 45 degree's offset from the turbines which could be up to 45 degree's opposite but I don't make the laws of physics.
superskullmaster 2 weeks ago
Comment removed
superskullmaster 2 weeks ago
@Anders811017 This type of turbine engine(radial inflow) also has the highest spool speed of all types. This is another reason they are used in turboprops and turboshafts. These tiny high spooling engines create huge torque when geared down. A Chinook engine is not very big at all but it has very high spool speeds. And so it can make over 4500hp despite how small it is. Your engine could most likely in a turboshaft/prop role make easily 70hp.
superskullmaster 2 weeks ago
@superskullmaster This engine will actually be the core of a turboshaft engine, I will use a 4th stage axial turbine wheel from a Allison 250C20 gas turbine as the power turbine and make a 6:1 gearbox to get the revs down from 30.000 to 5.000rpm.
The engine will be put in a tubilar chrome moly bike frame I am building at the moment and should put out close to 150hp if everything is done correctly, will have to run a TOT of 750°C to reach that sort of performance.
Anders811017 1 week ago
@Anders811017 Question. Have you tried starting the ignitionand fuel after 2 or so seconds of spooling?
superskullmaster 2 weeks ago
@superskullmaster The reason I wait for the fuel before I spool the engine up is that the fuel line was completely empty after overhaul so I had to fill it up for a couple of seconds.
I use propane for preheating/ignition of the diesel vapour and if I spool her up too early the propane flame is put out. Some more practice and flame-less starts should be possible.
Anders811017 1 week ago