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采用Fluent软件对大弯管多方案冲击/发散冷却特性进行了流固耦合传热计算,得到了不同方案的壁温和综合冷却效率的分布规律,并开展了大弯管壁温试验。结果表明:(1)流量系数和总压损失系数与当量流动面积有关,当量流动面积相同时,各方案的流量系数及总压损失系数相差不大;(2)在当量流动面积相同的条件下,增加发散孔开孔面积、减小冲击孔开孔面积对提高综合冷却效率有利;(3)发散孔及冲击孔的排布形式会影响综合冷却效率,在孔数、孔径、开孔面积均相同的条件下,六边形排布优于菱形排布。
Fluent software was used to calculate the heat transfer of the multi-project pipelines with large impact and divergence. The distribution of wall temperature and total cooling efficiency of different schemes were obtained and the wall temperature test of large pipe bend was carried out. The results show that: (1) The coefficient of flow and the total pressure loss are related to the equivalent flow area. When the equivalent flow area is the same, the flow coefficient and the total pressure loss coefficient of each scheme have little difference; (2) Under the same equivalent flow area , Increasing the opening area of the divergent holes and reducing the hole opening area of the impact holes are favorable for improving the overall cooling efficiency; (3) The arrangement of the divergent holes and the impact holes can affect the overall cooling efficiency. The number of holes, the pore diameter, Under the same conditions, hexagonal arrangement is better than diamond arrangement.