中文摘要：

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℃。

英文摘要：

High Temperature Gas-cooled Reactor（HTGR） demonstration power plant uses a helical tube once through steam generator.Due to the effects caused by helium cross flow over tube bundles and secondary flow in helical tubes,the wall temperature in the circumferential direction is uneven. Investigate the helical tube wall temperature distribution by numerical method has important meanings for the design of the steam generator.The local heat transfer coefficients in the helical tube are numerically simulated with its working conditions.Then the local heat transfer coefficients are set as the convective boundary condition to calculate the wall temperature distribution with helium cross flow over the tube.The results show that the highest temperature of the tube wall is located between the top and the side of the helical axis.The hot spot caused by the heat transfer non-uniformity is about 15°C.