Getting NASA9 polymonials thermo database for Cantera

[Kamil Niklasinski]

Hello,

 

firstly thanks for contributors to this project! It is a very good piece of work!

 

I'm working on a conference paper to present differences in combustion/rocket engine combustion calculations between Cantera and NASA CEA. 

In fact I wrote library that re-use Cantera combustion methods to obtain rocket engine performance parameters for frozen and shifting equilibrium.

 

I would like to verify how close can be Cantera calculated results to CEA results. To do this ideally I would like to convert NASA9 polymonials thermo database to Cantera CTI thermodynamic files.

 

I have been looking on the internet for some time on hints or tools that could be used and I found following (please correct me if I'm wrong):

1. Chemkin file format (that is used by Cantera's ck2cti converter) does not support NASA9 polynomials (see: Chemkin file specification, table 3 where a1 to a7 polynomials are specified). Therefore I cannot used ck2cti converter as there are no NASA9 polynomials in chemkin file format.

2. There is updated NASA thermodynamic file, using NASA9 polynomials, maintained by A. Burcat. However there is no tool to convert this file to .Cantera file format, nor it is possible to convert this to Chemkin file format due to reason outlined in point 1. This file uses NASA thermodynamic file format.

 

It would be great if there is a tool that enables conversion from NASA thermodynamic file format to Cantera .CTI format. Any suggestions, hits are welcomed!

 

Thank you advance!

 

Best regards,

Kamil

 

PS. Within a month I'm happy to post results of differences between Cantera and CEA. Preliminary calculations (excluding molar/mass fractions) show that combustion and rocket performance results are within 0,05% to 0,5% error.

 

[Carol Regalbuto]

Hi Kamil,

Did you ever get resolution on this? I'm having a similar problem. There is no phase information specified in the nasa.cti or nasa.xml files that come with Cantera, so I'm not finding a way to use importPhase to work with the files.

Carol

[Kamil Niklasinski]

I have not resolved it yet - actually I don't need it now. I may get back to this in 6-12 months.
Good luck!