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-   -   Thermodynamic data using the CEA (9-coefficients) polynomial format (https://www.cfd-online.com/Forums/openfoam-programming-development/225973-thermodynamic-data-using-cea-9-coefficients-polynomial-format.html)

charryzzz April 13, 2020 19:16

Thermodynamic data using the CEA (9-coefficients) polynomial format
 
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Hi Foamers!


Recently, I found that the enthalpy value of aluminum (in gas phase) calculated by the 7-coefficients polynomial in chemkin format has a large error compared with JANAF database (see https://janaf.nist.gov/tables/Al-005.html).


On the contrary, the 9-coefficients CEA polynomial function works (see, https://www.grc.nasa.gov/WWW/CEAWeb/TP-2002-211556.pdf) much better.



Please see the attached fig, circles indicate experimental data and CEA 9-co indicates the result calculated by CEA polynomial function and Chemkin 7-co indicates the result calculated by 7-coefficients polynomial in CHEMKINThermoFile, x axis represents the temperature and y axis represent the enthalpy of aluminum with reference temperature of 298.15K




So: did anyone implement this 9-coefficients CEA function in OF? or is there any way to implement this function in OF?



Jiarui

charryzzz May 6, 2020 04:19

Sorry, I found I made a mistake in calculating the enthalpy, the 7-coefficent chemkin polynomial works as good as CEA polynomial in the temperature range of 300- 5000K


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