Rocket thrust

If polywell fusion is developed, in what ways will the world change for better or worse? Discuss.

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taniwha
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Postby taniwha » Sun Nov 15, 2009 6:11 am


DeltaV
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Postby DeltaV » Sun Nov 15, 2009 6:20 am

This is depressing. My VTVL Polywell-powered space flitter is starting to look like an ozone/neutron/gamma-ray spewing humanoid annihilator during low altitude (non-QED/ARC) operation, if I can believe what you're telling me.

OK, time to dig deep into the well of engineering creativity, to come up with...
Magnetically diffused REB-heated, hermetically-sealed, rotary Stirling engines directly driving the lift fans and turbines!

[That takes care of the ozone at least. I think the other nasties can be ameliorated somewhat by throttling down the fusion rate.]

93143
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Postby 93143 » Sun Nov 15, 2009 6:52 am


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Postby kunkmiester » Sun Nov 15, 2009 7:10 am

Evil is evil, no matter how small

DeltaV
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Postby DeltaV » Sun Nov 15, 2009 7:12 am


DeltaV
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Postby DeltaV » Sun Nov 15, 2009 7:46 am


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Postby MSimon » Sun Nov 15, 2009 8:03 am


DeltaV
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Postby DeltaV » Sun Nov 15, 2009 8:40 am

Last edited by DeltaV on Sun Nov 15, 2009 8:42 am, edited 1 time in total.

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Postby MSimon » Sun Nov 15, 2009 8:42 am


taniwha
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Postby taniwha » Sun Nov 15, 2009 12:28 pm

According to , the dose limits are:

general public: 0.04Rem, 5Rem (0.5 for minors)
occupational: 0.4Rem, 5Rem, ~200Rem
astronaut: 150Rem, 300Rem, 400Rem

That's 30day limit, Yearly limit, Career Limit.

Also, I did the conversions from Sieverts to Rems in my head, so there may be mistakes.

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Postby MSimon » Sun Nov 15, 2009 12:30 pm


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Postby 93143 » Sun Nov 15, 2009 9:09 pm


kunkmiester
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Postby kunkmiester » Mon Nov 16, 2009 1:28 am

Evil is evil, no matter how small

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Postby 93143 » Mon Nov 16, 2009 5:33 am

I wonder if you could stick a turbine in that loop.

There's an energy supply and a pump. That would make it a power cycle.

But it's a weird power cycle, because it takes on energy at a low temperature and sheds it at a high temperature, like a refrigerator. The difference is the REB heater. You've got a five-part power cycle that...

I need to analyze this. It's too late at night now.


Either way, you need something to drive the compressor and fan, which says either electric motor or turbine. If turbine, you don't need one in the REB/heat exchanger loop, because said loop isn't useful at hypersonic speeds anyway; it tops out at roughly the same speed as the turbine in the engine. If electric motor, how much weight would you have saved by just putting the turbine there instead of in the exchanger loop?

So... never mind?

There's got to be a way to avoid dumping hydrogen at high speeds. But what else can you dump heat to? Use the wings as radiators? I've been down that road before, besides which it's very dangerous to be deliberately heating your structure when flying hypersonic. A design like that could get very heavy and/or brittle very fast...

That reminds me; are huge gigawatt-range turbofans going to have a problem with bird strikes? They happen now and then even with normal-sized engines...

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Postby DeltaV » Mon Nov 16, 2009 6:53 am



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