测定了半圆形通道内六根均匀加热元件的临界热流密度。采用“硅光电池”法进行临界监测。给出了加热段出口附近装有定位栅和整个加热段都不装定位栅(“光棒”)两种情况的实验结果,并将结果分别整理成两个经验公式。实验结果表明:此种结构定位栅使临界热流密度严重降低。 The critical heat flux of six uniform heating elements in semicircular channels was measured. The “silicon photovoltaic cell” method for critical monitoring. The experimental results of two cases where the positioning grid is installed near the exit of the heating section and the entire heating section is not installed are given, and the results are respectively sorted into two empirical formulas. Experimental results show that: the structure of the grid so that the critical heat flux density seriously reduced.