RV: [Rocketworkbench] Cpropep frozen perfomance calculations.]

[<ghe...@ci...>]

Dear Antoine and rocketworkbench colleagues,

I think the frozen perfomance calculations are now o.k. Most important,
entropy values are now constant at the three sections during expansion. The
subsisting differences in the output results with the example given in NASA
RP-1311, Mc Bride and Gordon, Part II, Users Manual and Program
Description,1996, could well be explained by differences in the heat of
formation of the ingredients and mainly by the fact that composition is
frozen in the  NASA example, not at chamber conditions, but from the throat
section (point 2)downwards, as can be appreciated comparing gas composition
with the corresponding equilibrium perfomance calculations.
For your information, please find attached a file with the relevant pages
(160-164) with the results from the example of the NASA report. I will try
to scan results of an example of  true frozen perfomance calculation fom
chamber downwards, from  the now classical  NASA SP-273, Gordon and Mc
Bride, 1973, and send it to you, so you can check your results more
properly. The NASA reports can be downloaded from
http://techreports.larc.nasa.gov
Antoine, thank you very much for your work and efforts. Cpropep is really a
fine contribution to rocket perfomance calculations and I'm using it already
for my lectures on Propulsion at the Army's Technical High School.
With best regards and wishes for futher success,

Gunterio Heineken