[AR] Re: H2O2 behavior
- From: David Weinshenker <daze39@xxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 17 Aug 2016 08:02:46 -0700
On 08/17/2016 05:34 AM, John Dom wrote:
As to non-hypergolic fuels with HP, since this dogma goes on, explain
why HTP always meets the fuel spray after its predecomposition in any
rocket motor or paper. That is, as a hot gas stream and never as a
liquid spray.
It's certainly a "path of least resistance" for a couple of reasons.
Only for the benefit of the cat pack’s high temperature decomposed
exhaust gas (water & oxygen), to allow auto-ignition of the fuel spray?
Making a mix igniter in the engine unnecessary.
That's one of the advantages - the other is that it's easy to do a safe
controlled startup, by establishing catalyst action on the peroxide
before admitting fuel. (The British engines used a sense port to feed
cat pack gas pressure to a piston which actuated a fuel valve, providing
a simple mechanical "start sequencing".)
As D. Andrews commented in JBIS, LOX/kerosene would have given a bit
more performance, but engine development would have been more complex.
-dave w
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