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采用双网格双二次样条插值模型,建立了p-h热力学面上水和水蒸气温度和熵的样条函数T~(SPL)(p,h)和s~(SPL)(p,h)。T~(SPL)(p,h)的计算,将P-h热力学面划分为五个子区,每个子区采用均匀网格,其中两相区简化为饱和线T~(sat)(p)的计算,并采用曲面延拓的方法对饱和线附近区域进行处理,s~(SPL)(p,h)的计算无需分区,为保证全区域计算精度,采用等差和等比两种非均匀网格划分方法。计算表明,T~(SPL)(p,h)的计算速度是T~(IF97)(p.h)的18.4～23.5倍,计算精度比T~(IF97)(p,h)高3到4个数量级。
The spline functions T ~ (SPL) (p, h) and s ~ (SPL) (p, h) of temperature and entropy of water and water vapor on the thermodynamics surface were established by using the double grid spline interpolation model. . T ~ (SPL) (p, h), the thermodynamic plane of Ph is divided into five sub-regions, and each sub-region is uniformly meshed. The two-phase region is simplified as the calculation of the saturation line T ~ The method of surface extension is used to deal with the area near the saturation line. There is no need to partition s ~ (SPL) (p, h). To ensure the accuracy of the whole area, two kinds of nonuniform mesh method. The calculation shows that the calculation speed of T ~ (SPL) (p, h) is 18.4 ~ 23.5 times of T ~ (IF97) (ph) and the calculation accuracy is 3 to 4 orders of magnitude higher than T ~ (IF97) .