Are there any documents or research papers available that estimate the
combustion efficiency as it relates to L*, stay time, chamber volume or any
other relevant parameter. I am trying to optimize mainly between L* and
heat losses but also partially weight for a smaller engine and don't really
have a good place to start.
Thank you,
Zachary Martinez
Aerospace Engineering | Missouri S&T
On Sat, Aug 6, 2016 at 10:52 PM, David Gregory <david.c.gregory@xxxxxxxxx>
wrote:
Combustion efficiency is really just a measure of how well mixed the
propellants are when they get to the throat. It is usually estimated based
on similarity to empirical data. I.e guessed based on experience. Wall
losses are accounted separately from combustion losses.
For a first of its kind design I would probably use 90% as an upper
bound. You're unlikely to be disappointed if it comes in high.
On Aug 6, 2016, at 4:44 PM, Lars Osborne <lars.osborne@xxxxxxxxx> wrote:get. It helpfully reports the theoretical isp as well as what performance
Hi All,
When designing a new engine I start by running RPA and seeing what I
you could expect with estimated losses.
how does one estimate the reaction/combustion efficiency? I know that with
Nozzle efficiency makes sense to me, and Sutton explains it well, but
tiny motors, as many of us are making, wall-losses can become a major
performance detriment. Are there scaling factors I could apply based on
chamber size?
Thanks,
Lars Osborne
