التفاصيل البيبلوغرافية
| العنوان: |
超临界二氧化碳物性表格多方法计算特征研究. (Chinese) |
| Alternate Title: |
Study on Calculation Characteristics of Multi-method in Property Table of Supercritical Carbon Dioxide. (English) |
| المؤلفون: |
梁成彬, 郑 群, 刘 彪, 姜玉廷 |
| المصدر: |
Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng; 2024, Vol. 39 Issue 8, p76-85, 10p |
| Abstract (English): |
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 related to the thermal design of systems and components and the accurate prediction of aerodynamic performance 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 interpolation is the smallest in the whole region, with the order of magnitude between 10 - 4 and 10 - 3 . In contrast, the average error of B-spline interpolation along the saturation line is the lowest with the largest error of only 10 - 2 . The resolution of the table is 401 × 401, which can give consideration to both calculation cost and solution accuracy. Moreover, the calculation time based on property table scheme is much less than that using REFPROP database. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
超临界二氧化碳 (sCO2) 闭式布雷顿循环发电在能源领域展现出一定优势, 而 sCO2 物性的准确快速计算直 接关系到系统和部件的热力设计及压缩机和透平气动性能的准确预测。 本文建立了包括表格自生成、索引查找及 不同插值算法的高效模拟 sCO2 物性的表格计算体系, 提出了有效表格的通用制作方法, 结合 sCO2 定压比热和密度 变化规律, 研究了双线性、双立方和 B 样条插值方法计算特征, 并对比了不同表格分辨率的影响程度及各方案计算 耗时。 结果表明:物性表格计算的高误差主要分布在饱和线附近; 双立方插值在全域平均误差最小, 数量级在 10 -4 ~ 10 - 3 之间, B 样条插值沿饱和线平均误差最低, 最大误差数量级仅为 10 - 2 ; 表格分辨率取 401 × 401, 可兼顾计算成 本和求解精度; 基于物性表格方案计算耗时远低于 REFPROP 数据库。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |