One advantage of low density propellants is that a slight excess of the lighter
one and burning the heavier one to depletion is a good strategy when you have a
bit of uncertainty.
George William Herbert
Sent from my iPhone
On Dec 10, 2015, at 6:57 AM, Paul Breed <paul@xxxxxxxxxx> wrote:
Getting simultaneous propellant depletion at clost to optimum ISP is what
matters.... it does not matter if the earlier part of the burn might be
slightly off on O:F the steep part of the curve is at the end.
On Wed, Dec 9, 2015 at 9:21 PM, David Weinshenker <daze39@xxxxxxxxxxxxx>
wrote:
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