Post by pulsedpropulsion on Sept 25, 2014 20:32:00 GMT -5
I am rather new to this forum, as you can tell, so I guess this is my introduction! My name is Thomas Row and I'm studying Aerospace engineering at the University of Kansas. I've been doing rockets for a long time, but for years I've wanted to do jet engines. I have recently built a very large pulsejet named Mater with Mr. Feathers! As he has already said, our club PESO is building a Turboshaft Kart. We will probably need all the help we can get from you gents, so any and all help is welcomed!
You can grind a tool to the correct profile, or just start cutting and keep fitting up the turb wheel to the piece in the chuck and check where bits need removing , it can be a time consuming process getting the profile correct with the desired clearances.
The first step is to bore the piece to the exducer diameter plus clearance , then go from there.
Can I ask why you're concerned about the freepower at this early stage of development , its advisable to get the gas producer working and sorted first , then measure the energy (temperature and total pressure) in the exhaust from the gas producer when fitted with a suitably sized jet nozzle to optimise that jet pipe energy.
Once you know the mass flow , temperature and pressure thats available , the power turbine stage can be designed, taking into account the type of transmission ( gears or chain) to be used along with the projected/desired maximum rpm of the freepower turbine.
If you are going to use a ST50 for the gas producer you'll be needing quite a large freepower wheel , generally around twice the flow space as the gas producer turbine wheel .
Get the gas producer going and then we'll complicate things by talking about power turbines , far too early to be worrying about it :-)