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开展堆腔注水冷却系统的临界热流密度(CHF)实验。采用等宽矩形发热段模拟压力容器下封头,分别在池式沸腾及强迫循环工况条件下,对发热壁面不同角度位置处的CHF限值进行实验研究。实验结果表明:在池式沸腾和强迫循环工况条件下,CHF随角度的变化关系都可以分为3段,在靠近入口的区域,池式沸腾条件下CHF随角度增加而升高,而强迫循环工况条件下CHF随角度增加逐渐降低;在中部区域,CHF随角度增加而升高;在靠近出口的区域,CHF随角度增加而降低。
Carry out a critical heat flux density (CHF) experiment of the reactor cavity water injection cooling system. An equal-width rectangular heating section was used to simulate the pressure vessel bottom seal. Experimental studies were conducted on the CHF limits at different angles of the heating wall under pool boiling and forced circulation conditions respectively. The experimental results show that CHF can be divided into three stages under the condition of pool boiling and forced circulation. In the area close to the entrance, CHF increases with the increase of the angle under the pool boiling condition, and the forced CHF gradually decreased with increasing angle under cyclic conditions; in the central region, CHF increased with increasing angle; CHF decreased with increasing angle in the region near the exit.