[AR] Fw: Igniter questions
- From: Graham Sortino <gnsortino@xxxxxxxxx>
- To: arocket freelists <arocket@xxxxxxxxxxxxx>
- Date: Sat, 26 Oct 2013 16:57:50 -0700 (PDT)
Apologies, in advance as I'm almost positive this question was already answered
but I can't seem to find the responses.
Re-phrased:
1. When designing a (GOX/Ethanol) igniter should the chamber pressure be higher
or lower then the main engine pressure? Also, are there any rules for choosing
an injector pressure relative to the main engine pressure?
2. If the igniter pressure should be lower than the chamber pressure then how
does one prevent propellants flowing back through the injector orifices?
Thank you very much.
Graham
On Thursday, May 19, 2011 10:16 AM, Joel Scotkin <arocket@xxxxxxxxxxxxxxxxxxxx>
wrote:
On 05/18/2011 10:45 PM, Robert Watzlavick wrote:
> I'm going to be
working on an augmented spark igniter (ASI) to try and
> improve the starting of my 250 lb LOX/kerosene motor. I was wondering
> about the chamber pressure for the igniter - I would think it needs to
> be >= than the main chamber pressure to keep it from flowing back into
> the igniter. Am I missing something? I've noticed that some designs
> shut the igniter off after a few seconds and in that case, how do you
> keep from the gases from the main chamber from backing up through the
> igniter orifices and into the feed lines? The few igniter pictures
> I've seen show small solenoid valves that typically aren't rated for
> enough pressure to handle the main propellant tank pressures. My
> kerosene tank pressure is ~490 psi (large drop through cooling jacket)
> and the LOX tank pressure is ~340 psi.
>
> Thanks in advance,
>
-Bob
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