大弯管冲击/发散冷却特性的数值计算与分析

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。 

Numerical computation and analysis of impingement/effusion cooling performance on concave wall

Fluid/solid conjugated heat transfer numerical computation was conducted to study the impingement/effusion cooling performance on concave wall of different schemes by Fluent software, and the trend of wall temperature and the integrative cooling effectiveness were obtained, while the wall temperature test of the concave wall was carried out. The results indicated that: (1) the discharge coefficient and the total pressure loss coefficient were relevant to the equivalent hole area, and the discharge coefficient and the total pressure loss coefficient of different schemes were equivalent when the equivalent hole area was uniform. (2) When the equivalent hole area was uniform, the integrative cooling effectiveness could be improved if the effusion hole area was expanded or the impingement hole area was decreased. (3) The integrative cooling effectiveness was affected by impingement and effusion holes arrangement, and the integrative cooling effectiveness of hexagonal arrangement was better than the integrative cooling effectiveness of rhombus arrangement when the hole number, hole diameter and the hole area were uniform.