[AR] Re: Arocket Pump Progress
- From: Peter Fairbrother <zenadsl6186@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 14 Jul 2015 16:10:25 +0100
On 14/07/15 14:36, Monroe L. King Jr. wrote:
That does help some! Thank you. I do believe working from this design is
better than trying to go with a V-2 design :)
It's not bad, but if I was designing a turbopump I'd use the Merlin
engine turbopump as an example. It's a pretty good one.
http://www.barber-nichols.com/sites/default/files/wysiwyg/images/merlin_turbopump.jpg
The picture is pretty small, but it shows most things: at the bottom,
from left to right, there is the LOX pump with integral inducer, the
shaft with fuel pump and inducer, the turbine wheel.
It is a reaction turbine, and I think a partial admission one - a
reaction turbine has less end thrust than an impulse turbine, and in
theory only a very low pressure differential across the disk - with a
single shaft with two pumps, both with screw inducers, pumping in
opposite directions to balance end thrust.
Note that the turbine gas flows to the left, creating a leftward end
thrust on the shaft, and the LOX flows to the left, creating a rightward
end thrust to balance both the turbine end thrust and the lesser
leftwards thrust of the fuel pump (fuel flows to the right).
For a smaller engine I would consider Barske style partial emission
pumps, or closed impellers; if nothing else, in order to make
construction easier. Perhaps tesla inducers too.
-- Peter Fairbrother
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