Coolant is filled in gap between upper flywheel and components around . When the upper flywheel rotates at rated speed , turbulent Taylor vortices can be observed in the gap fluid .In order to predict and estimate the influence of turbulent Taylor vortices on heat transfer effect of the coolant ,different turbulent models were chosen to simulate this phenomenon .The result of Reynolds stress model is proved to be the best one after comparing with an existing experiment .It is shown that several pairs of Taylor vortice distribute periodically along the side of flywheel and only one vortex is found near the top and bottom of flywheel .Heat flux and Nusselt number on the side of flyw heel show a periodical variation characteristic w hich is determined by the distribution of turbulent Taylor vortices near the wall .Therefore heat transfer effect is greatly enhanced by turbulent Taylor vortices ,which will exert great effect on the temperature distribution of flyw heel and components around .%反应堆冷却剂主泵飞轮周围的间隙空间充满流体。飞轮按额定工况速度旋转时，间隙内流体作周向剪切流动的同时产生强烈的湍流泰勒涡二次流动，改变了飞轮间隙流的传热特性。本文采用不同的湍流模型对湍流泰勒涡进行了模拟，雷诺应力模型的模拟结果与现存实验结果最为接近。数值模拟显示，主泵飞轮圆柱面间隙中充满排列规则的周期泰勒涡对，飞轮端面间隙中出现覆盖全端面的扁环形涡胞。飞轮圆柱表面的当地热流密度和努塞尔数与泰勒涡一样呈明显的周期性变化规律。圆柱面泰勒涡对和端面涡胞增强了飞轮区域的传热能力，对飞轮和周围承力部件的温度分布产生重要影响。
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