[AR] Re: LOX/kero layout (was Re: Above 65000 ft for free)
- From: Ed LeBouthillier <codemonky@xxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 6 Sep 2018 13:35:41 -0700 (GMT-07:00)
Also at 400N I'm not sure a turbopump would be the most efficient
choice. Far as I knew they don't scale down to sizes that small that
well.
They do not, which is why I have been working on exotic materials for
blisks.
You can increase the overall specific speed of centrifugal pumps by staging one
into the other and reducing the head required of each pump.
So, by having two stages, you double the overall specific speed. If you have
three stages, then you triple the overall specific speed. Successive staging
could put the overall specific speed into a usable range.
There will still be Reynolds number type losses at the lower scale, but you
should get better efficiency.
For a reference, check out:
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20060000023.pdf
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