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探讨了在核反应堆热工流体力学中具有普遍意义的不同温度流体达到热混合均匀状态的过程和机理。１０ＭＷ高温气冷实验堆（ＨＴＲ－１０）热气导管内的流体热混合主要是径向对流扩散过程。用流体温度空间分布的方差表示混合效果，通过雷诺比拟方法求得在点热源下游流动流体的径向扩散系数解析解，与在模拟热气导管内的点热源下游流动流体的扩散混合实验的结果相符合。在雷诺数Ｒｅ为（１．００～３．５０）×１０５范围内，径向湍动系数εｒ的相应范围是（１．００～４．００）×１０－３ｍ２／ｓ。反映混合效果的湍动系数与流速ｕ之比εｒ／ｕ随雷诺数Ｒｅ变化不大，解释了在高温堆堆芯底部结构中Ｒｅ对流体混合效果影响不大的现象。
In this paper, the process and mechanism of achieving uniform fluid mixing at different temperatures with universal significance in the thermal fluid mechanics of nuclear reactors are discussed. The hydrothermal mixing in the HTR-10 hot gas duct is mainly a radial convection diffusion process. The variance of the spatial distribution of fluid temperature is used to represent the mixing effect. The analytical solution of the radial diffusivity of the flowing fluid downstream of the point heat source is obtained by the Reynolds-ratio method. The results are compared with the results of the diffusion mixing experiment of the flowing fluid downstream of the point heat source in the simulated hot gas duct meets the. The range of radial turbulence coefficient εr is (1.00 ~ 4.00) × 10-3m2 / s when the Reynolds number Re is (1.00-3.00) × 105. The ratio εr / u of the turbulence coefficient and the flow rate u, which reflects the mixing effect, does not change much with the Reynolds number Re, and explains that Re has little effect on the fluid mixing effect in the bottom structure of a high-temperature reactor core.