40-T混合磁体外超导线圈迫流氦流动摩擦系数分析

Friction factor analysis of forced flow supercritical helium in 40-T hybrid superconducting outsert

40-T混合磁体外超导磁体使用4.5 K超临界氦进行迫流冷却。迫流氦在管内电缆导体(CICC)内的流动过程受到摩擦阻力的影响会造成一定的压降和热量产生,同时由外界带来的热量也会由迫流氦带走来让磁体保持在超导温区。使用了超导磁体实际运行过程中的实验数据计算不同导体结构下雷诺数与摩擦系数的变化关系,利用Katheder经验公式对实验的摩擦系数进行了重新拟合,给出了适用于该导体摩擦系数的经验公式。

40-T hybrid magnet superconducting magnets are cooled using 4. 5 K supercritical helium.The flow of helium in the Cable-in-conduit conductors（ CICC） is affected by the frictional resistance and can cause pressure drop and heat generation. While,the heat from outside will be carried by the helium to keep the magnet in the superconducting temperature zone. Using experimental data of 40-T superconducting magnet to calculate the relationship between Reynolds number and friction coefficient of different conductor structures. The friction coefficient of the experiment was re-fitted based on Katheder＇s empirical formula.