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在临界点附近时,超临界水的热膨胀系数很大,随着压力的升高,拟临界点的热膨胀系数迅速下降,拟临界点的热膨胀系数是计算临界相变转换数的基础,对于分析超临界压力下的流动不稳定性非常重要。因此,计算超临界水在拟临界点的热膨胀系数,对于了解和掌握超临界水堆中能量的转换或热量传递非常重要。运用MATLAB曲线拟合工具箱,对超临界水的拟临界点的膨胀系数进行了拟合回归分析。拟合得出了超临界水的拟临界点的热膨胀系数的计算公式。该公式具有结构简单易于计算的特点,最大绝对误差为0.20 K-1,最大的相对误差为0.19%,计算精度满足工业研究与分析的要求。
In the vicinity of the critical point, the coefficient of thermal expansion of supercritical water is very large. With the increase of pressure, the coefficient of thermal expansion of the quasi-critical point decreases rapidly. The coefficient of thermal expansion of the quasi-critical point is the basis for calculating the critical phase transition number. Flow instability under critical pressure is very important. Therefore, calculating the coefficient of thermal expansion of the supercritical water at the pseudo-critical point is very important for understanding and grasping the energy transfer or heat transfer in the supercritical water reactor. Using MATLAB curve fitting toolbox, the coefficient of expansion of the critical point of supercritical water was fitted and analyzed. The formula of thermal expansion coefficient of pseudo-critical point of supercritical water is obtained by fitting. The formula has the characteristics of simple structure and easy calculation. The maximum absolute error is 0.20 K-1 and the maximum relative error is 0.19%. The calculation accuracy meets the requirements of industrial research and analysis.