[AR] Re: Closing the loop on rocket engines

  • From: David Weinshenker <daze39@xxxxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Wed, 9 Dec 2015 21:21:53 -0800

On 12/09/2015 08:59 PM, Monroe L. King Jr. wrote:

I'm not suggesting using car O2 sensors I know they wont work. I'm
looking for something that will work.

Those optical sensors are not the same as O2 sensors.

Engine management in cars is what I know I am speaking generally in that
direction based on what I know about that.

I see plenty of reasons to want better control over the engine.

Yes, mixture control is a good reason.

A valve can be controlled, pressure/rpm of the power turbine and many
other factors.

If you want to do closed-loop control of rocket O/F ratio, there may be
usable methods other than direct flame-chemistry sensing - e.g., using
the pressure drops across the injectors as a proxy for flow measurement,
and then "closing the loop" to maintain a desired relationship between
those signals.

-dave w


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