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本文阐述在标准内径38.1毫米光管和内螺纹管中所进行的临界热负荷试验结果,以确定沿管周受热不均匀对临界热负荷的影响。电加热试验段采用汽水流上升流动,压力18.6兆帕(2700磅/英寸~2)管子与水平线的倾角为15、30和90度。试验数据是在名义峰值热负荷与平均热负荷之比为2时得出,并与以前所得的均匀受热试验数据进行比较。用峰值热负荷作为相关参数,发现受热不均匀的影响与管子几何形状(内螺纹或光管)、管子方位、峰值热负荷在管周上的位置以及相对蒸汽干度等因素有关。
This article describes the results of a critical heat load test conducted on a standard internal diameter 38.1 mm tube and internally threaded tube to determine the effect of uneven heating along the tube circumference on the critical thermal load. The electrical heating test section used a flow of soda flow up and the 18.6 MPa (2700 psi) pipe was inclined at 15, 30 and 90 degrees to the horizontal. The test data are obtained when the ratio of the nominal peak heat load to the average heat load is 2 and compared with the previously obtained uniform heat test data. Using the peak heat load as a relevant parameter, we found that the influence of uneven heating is related to the geometry of the pipe (female or light pipe), the orientation of the pipe, the location of the peak heat load on the pipe circumference, and the relative dryness of the steam.