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通过实验研究发现,自然循环系统中自然循环流量与加热功率以及自然循环流量和系统总阻力之间分别存在关系:G~Q~m和Δp_t~G~q,分别定义m和q为流量-功率特征数和流动-阻力特征数。考虑自然循环系统局部阻力和沿程阻力的作用,采用拟合逼近的方法求解得到自然循环系统热工参数之间的近似解析关系,与实验结果吻合较好。研究表明,流量-功率特征数m与整个系统流动状态和阻力特性密切相关,是系统雷诺数Re和系统局部阻力系数和沿程阻力系数比值R_n的函数,且m随着R_n的增大逐渐减小。自然循环系统流动-阻力特征数与流量-功率特征数存在关系q=(1-m)/m,并得到实验验证。
Through experimental study, it is found that there is a relationship between natural circulation flow, heating power, natural circulation flow and total system resistance in natural circulation system respectively: G ~ Q ~ m and Δp_t ~ G ~ q, defining m and q as flow- The number of features and the number of flow-resistance features. Considering the local resistance of natural circulation system and the effect of resistance along the path, the approximate analytic relationship between the thermal parameters of natural circulation system is solved by fitting approximation method, which is in good agreement with the experimental results. The results show that the flow-power characteristic number m is closely related to the flow and resistance characteristics of the whole system and is a function of the Reynolds number Re and the ratio of local drag coefficient to the drag coefficient R_n. As the R_n increases, small. Natural circulation system flow - the number of resistance characteristics and flow - power characteristics of a relationship q = (1-m) / m, and experimental verification.