Study on Calculation Characteristics of Multi-method in Property Table of Supercritical Carbon Dioxide
Supercritical carbon dioxide(sCO2)closed Brayton cycle power generation shows a certain advantages in the energy field.Accurate and rapid calculation of sCO2 physical properties is directly re-lated to the thermal design of systems and components and the accurate prediction of aerodynamic per-formance of compressors and turbines.In this paper,the table calculation system for efficiently modeling the physical properties of sCO2 is established,including table self-generation,index search and different interpolation algorithms.A general method of making effective tables is put forward.Combined with the rules of variation of sCO2 isobaric specific heat and density,the calculation characteristics of bilinear,bicubic and B-spline interpolation methods are studied.The influence degree of different table resolutions and the calculation time of each scheme are compared as well.The results show that the high error of property table calculation is mainly distributed near the saturation line.The average error of bicubic inter-polation is the smallest in the whole region,with the order of magnitude between 10-4 and 10-3.In con-trast,the average error of B-spline interpolation along the saturation line is the lowest with the largest er-ror of only 10-2.The resolution of the table is 401×401,which can give consideration to both calcula-tion cost and solution accuracy.Moreover,the calculation time based on property table scheme is much less than that using REFPROP database.
carbon dioxideproperty tableinterpolation methodcalculation accuracy and costREF-PROP
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