Richard, Kind of off the wall thought here. I wonder if an infrared
thermometer could be used? It would be a good project for someone if it's
worth the effort or for someone that does it just for the sake of can it be
done. lol
Michael
From: Richard Nakka <richard.rocketry@xxxxxxxxx>
To: sugpro@xxxxxxxxxxxxx
Sent: Thursday, March 8, 2018 10:08 AM
Subject: [sugpro] Re: Questions going through Nakka KNSU Technical Notepad
<<How do you know that all the products in the chamber are gaseous unless you
know for sure what the temperature is in the chamber? Have you measured the
temperature in the chamber during the burn?>>
That is a good question. When designing a motor, you don't have the option of
measuring the actual combustion temperature since the motor has not yet been
built. As such, you simply make the assumption that GUIPEP prediction of
combustion products and temperature are right. Typically throw in a knock-down
factor for temperature of a few percent, as we don't expect to get perfect
combustion efficiency. We design and build the motor on this basis, do a static
firing taking thrust and perhaps pressure measurements. If the results are in
reasonable agreement, we're happy. If not, and you suspect combustion may be a
factor, we can then endeavour to measure combustion temperature. Which,
unfortunately, is not so straightforward to do with great accuracy. And may
simply lead you astray :-\
Richard
