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高温气冷堆采用螺旋管式直流蒸汽发生器。在氦气横掠管束及螺旋管内二次流的双重作用下,传热管壁面温度沿周向分布很不均匀。采用数值模拟方法研究螺旋管壁面温度分布,对蒸汽发生器的设计具有重要意义。根据实际工况计算得到螺旋管内局部对流换热系数,并将其作为边界条件,计算得到氦气横掠过热段螺旋管的管壁温度分布。结果表明,过热段传热管壁面最高温度位于顶部及螺旋内侧之间。由于氦气横掠管束及螺旋管内蒸汽对流换热不均匀引起的壁面热点偏差约为15℃。
High-temperature gas-cooled reactor with a spiral tube steam generator. Under the double action of the helium cross-flow tube bundle and the secondary flow in the spiral tube, the wall temperature of the heat transfer tube is unevenly distributed in the circumferential direction. The numerical simulation of spiral pipe wall temperature distribution is of great significance to the design of steam generator. According to the actual working conditions, the local convective heat transfer coefficient in the spiral pipe was calculated and used as the boundary condition to calculate the wall temperature distribution of the helical cross-helical section of helium. The results show that the maximum temperature of the wall surface of the superheating section of the heat transfer tube is located between the top and the inside of the spiral. The hot spot deviation of the wall due to the non-uniform heat transfer in the helium cross-over tube bundle and the helical tube is about 15 ° C.