Orbitec's VCCW thrust chamber and Polywell

Discuss the technical details of an "open source" community-driven design of a polywell reactor.

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DeltaV
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Orbitec's VCCW thrust chamber and Polywell

Postby DeltaV » Fri Jun 04, 2010 10:23 pm


DeltaV
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Postby DeltaV » Sun Jun 06, 2010 6:40 am


zapkitty
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Postby zapkitty » Sun Jun 06, 2010 10:27 am

If you're using air augmentation then, while you may use the vortex to keep the plasma from eating your nozzles, you are still going to be moving a lot of air that while hotter than jet exhaust won't be heated to anywhere near plasma temperatures... so could that cooler air be used to cool the nozzle walls instead while the plasma is heating the air?

And outside of the nozzles is the ducting. The primary drawback to air augmentation is the weight of the ducting but designers were willing to work with that even for the chemically-powered Nova rockets...

Now, this design is oversized for the task, 500 tons to LEO, but it's a VTVL design that I think, in a smaller version with 2 polywells stacked where the LH2 tank is, might be closer to the results you want:

Image

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... okay, I admit it...I've just always liked this design... :)

Stoney3K
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Re: Orbitec's VCCW thrust chamber and Polywell

Postby Stoney3K » Sun Jun 06, 2010 11:10 am

Because we can.

DeltaV
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Postby DeltaV » Sun Jun 06, 2010 8:54 pm


DeltaV
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Re: Orbitec's VCCW thrust chamber and Polywell

Postby DeltaV » Sun Jun 06, 2010 9:06 pm


DeltaV
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Postby DeltaV » Mon Jun 07, 2010 7:26 am

Grrrr... further research shows that arcjets used for satellite thrusters have dismal peak thrust (Newtons), and efficiencies only around 30-40% (though above we're talking about 3-5 orders of magnitude more electrical power). I got overly excited when I saw test facility arc heaters with chamber pressures about 1/2 of the SSME's chamber pressure. It'd be interesting to know what effect "fractalizing" the arc discharges would have on energy transfer, electrical to airflow. In any event, the reverse-flow vortex design might still be useful for thermally managing other heating methods, like REB. Maybe a REB self-fractalizes as it interacts with air.

Image


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