在1:1.5相似模拟试验台架上进行了10MW试验高温气冷反应堆堆底结构中的气体流动试验,其目的之一是研究堆底流道及热气导管的冷却剂热混合性能。描述了试验台架和试验情况,并给出了主要试验结果。结果表明,所设计的堆底反射层中的流道结构具有很好的冷却剂热混合性能,在热气导管出口处,温度混合程度达98％以上,而冷却剂的热分布均匀程度超过了99％。 One of the objectives of the 10MW pilot gas flow test in the bottom structure of a 10MW high-temperature gas-cooled reactor on a 1: 1.5 similar simulation test rig was to study the thermal compounding properties of the coolant at the bottom runner and the hot gas duct. Describes the test bench and test conditions, and gives the main test results. The results show that the flow path structure in the designed reactor bottom reflector has very good thermal compounding properties. At the outlet of the hot gas duct, the mixing temperature is over 98%, while the thermal uniformity of the coolant is over 99 %.