This study experimentally investigates the axial heat transfer of the secondary flow in the cylindrical annular gap around a flywheel within a canned reactor coolant pump, belonging to the Taylor-Couette (TC) flow. A dynamic method based on the transient temperature responses of the TC flow to the input thermal waves, where the axial heat transfer coefficient is determined by the amplitude decay and phase lag of axially propagating temperature waves, is proposed. The influences of viscous heating are distinguished using the mean temperature distribution, allowing for the performance of decoupling tests of axial heat transfer and viscous heating in TC flow. The modification of the boundary heat loss on the axial propagation of temperature waves in a rotor-fluid-stator TC system was modeled. The measured axial heat-transfer coefficient was insensitive to the oscillating periods of the input thermal waves within the maximum permitted period. The axial heat transfer coefficients with different Taylor numbers and radius ratios were measured based on the proposed method. The correlations between the axial heat-transfer coefficient and Taylor number satisfied the scaling law with an effective exponent of 0.5, but they change non-monotonically with respect to the radius ratio in highly turbulent TC flow. This study provides insight into the axial heat transfer characteristics of TC flow.

这项研究通过实验研究了密封反应堆冷却剂泵内飞轮周围圆柱形环形间隙中二次流的轴向传热，属于 Taylor-Couette (TC) 流。提出了一种基于TC 流对输入热波的瞬态温度响应的动态方法，其中轴向传热系数由轴向传播的温度波的幅度衰减和相位滞后确定。使用平均温度分布区分粘性加热的影响，从而可以进行轴向传热和 TC 流中粘性加热的解耦测试。模拟了转子-流体-定子 TC 系统中温度波轴向传播边界热损失的修正。测得的轴向传热系数对最大允许周期内输入热波的振荡周期不敏感。基于所提出的方法测量了具有不同泰勒数和半径比的轴向传热系数。轴向传热系数与泰勒数之间的相关性满足标度律，有效指数为0.5，但它们在高湍流TC流动中相对于半径比非单调变化。这项研究提供了对 TC 流轴向传热特性的深入了解。轴向传热系数与泰勒数之间的相关性满足标度律，有效指数为0.5，但它们在高湍流TC流动中相对于半径比非单调变化。这项研究提供了对 TC 流轴向传热特性的深入了解。轴向传热系数与泰勒数之间的相关性满足标度律，有效指数为0.5，但它们在高湍流TC流动中相对于半径比非单调变化。这项研究提供了对 TC 流轴向传热特性的深入了解。