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从敏感性的角度分析超临界水在拟临界区特殊的物性变化对于壁温偏差的放大作用。首先以超临界传热公式为例讨论换热系数对热工参数的敏感性,然后以超临界圆管实验为例,讨论对称布置的热电偶测量到的壁温偏差在拟临界区的放大效果。分析表明:拟临界区的物性因素可能使圆管的周向均匀性特征不再满足,这是造成传热公式分散性的可能原因之一。
The sensitivity of the supercritical water in the proposed critical section of the physical properties of the wall temperature deviation amplification. Firstly, taking the supercritical heat transfer formula as an example, the sensitivity of the heat transfer coefficient to the thermal parameters is discussed. Then, taking the supercritical circular tube experiment as an example, the amplification effect of wall temperature deviation measured in the symmetrically arranged thermocouple in the pseudo-critical area . The analysis shows that the physical property of the critical section may make the circumferential uniformity of the pipe no longer be satisfied, which is one of the possible reasons for the dispersion of the heat transfer formula.