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快堆顶盖存在一些大小不同的环形空间，这些空间是由穿过顶盖结构的一次泵及热交换器构成的，并使环形空间内的氩气产生自然对流。用有机玻璃建造的实验台，模拟快中子堆主壳顶盖竖直环形空间，进行自然对流实验研究。同时，采用LVEL零方程湍流模型对自然对流进行了数值模拟，所获结果与实验数据基本吻合，表明该模型比常用的kε模型所得出的流型与文献中的和该实验的观测结果更加相符，也能够更加准确地预测环形空间内的温度场与速度场。
There are a number of different sizes of annular space in the top of the fast reactor. These spaces are formed by a primary pump and a heat exchanger passing through the top cover, and natural convection of the argon in the annular space occurs. Using plexiglass test bench to simulate the vertical annular space of the fast shell of the fast neutron reactor, a natural convection experiment was conducted. At the same time, the numerical simulation of natural convection is carried out by using the LVEL zero-equation turbulence model. The obtained results are in good agreement with the experimental data, which shows that this model is more consistent with the experimental results in the flow pattern than the conventional kε model , But also more accurately predict the temperature field and velocity field in the annular space.