多环套装重金属结构设计是一种有效提高核主泵飞轮转动惯量的结构设计方法之一，为保证其在严苛工作条件下的结构强度安全，采用有限元法，在考虑过盈配合预应力以及离心力的基础上，首次对高温工作环境下的核主泵多环套装重金属钨合金飞轮进行稳态热应力分析，探讨工作环境温度因素对核主泵飞轮结构设计的影响。通过建立由内轮毂、中间层重金属钨合金以及外保持环三层结构组成的核主泵飞轮结构有限元模型，研究其在高温工作环境下的结构热应力；此外将整体式与分块式钨合金层结构飞轮进行比较，研究两种结构形式下的热应力特性；为寻求钨合金层分块设计的最佳分块数，研究了不同分块数下的核主泵飞轮结构热应力。研究表明，在高温工作条件下，核主泵飞轮中间钨合金层会产生很大的热应力，通过钨合金层的分块设计以及采用合适的钨合金分块数可以有效降低这种热应力。
The design of multi-ring flywheel packing heavy alloy is one of effective methods to improve the rotation inertia for a reactor coolant pump flywheel. To ensure the flywheel structural safety at critical working condition, finite element analysis method is adopted to carry out the steady thermal stress analysis process considering the interference-fit and rotating force simultaneously, moreover, to study the effect of high temperature on the structural design of reactor pump flywheel. Firstly, finite element analysis model consisting of inner hub, tungsten alloy layer and outer retainer is established to evaluate the thermal stress of flywheel under high temperature. Then, the thermal stress characteristics of two kinds of flywheel structures respectively comprised of integrity tungsten alloy layer and tungsten alloy segments are further studied. In addition, the effect of the number of tungsten alloy segments on the structural design is further studied to seek the optimal number. Finally, the results indicate that the high temperature will give rise to high thermal stress in the tungsten alloy layer. However, the flywheel design comprised of tungsten alloy segments with optimal number can significantly release the high thermal stress.
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