核聚变第一壁射流冷却通道换热特性数值模拟

A new type of internal cooling channel for the first wall of nuclear fusion based on jet flow was designed. The effects of operating and structural parameters on the flow and heat transfer characteristics of the jet cooling channel were preliminarily explored. The heat transfer characteristics of the jet cooling channel were compared with the prototype straight channel under the same operating parameters. The cooling performance of the jet cooling channel was measured by analyzing the Nusselt number Nu, flow resistance coefficient f and comprehensive performance evaluation index ηPEC. Results show that compared to the prototype straight channel, the average temperature of the first wall heating surface is reduced by 182 K, and Nu is improved by 132% using a jet cooling channel under the same operating parameters. As the mass flow rate of the coolant increases, Nu and f of the jet cooling channel both increase, enhancing the cooling performance. Changing the heat flux density of the heating surface will not affect its heat transfer characteristics and f. Within the considered structural parameter range, increasing the diameter and lateral spacing of the jet channel, reducing the taper ratio and longitudinal spacing of the jet channel, and using parallel arrangement of the jet channel can make the jet cooling channel have the best cooling performance.