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为了验证抑制自然对流的努谢尔数保持技术的正确性，发展了一种大空间气流流场的可视化技术。采用蚊香燃烟示踪气流，激光片光源照亮烟气固体微粒，以显示在不同尺寸模型中不同Ｒｅ数和Ｇｒ数下的流场特征。较好地解决了大面积的恒热流加热的实验技术问题，同时在实现均匀来流、减小烟气扩散等方面也作出了探索；实验获得了十分清晰的模型中的流场可视化照片。两种热缩比模型中的流场的观察结果表明，合理地采用适当尺寸的缩小模型，确实可以在地面消除重力对流动与换热的影响。
In order to verify that the Nusselt number that suppresses natural convection maintains the correctness of the technique, a visualization technique has been developed for the flow field of large space airflow. The mosquito cigarette smoke tracer airflow was used, and the laser light source illuminates the flue gas solid particles to show the flow field characteristics under different Re numbers and Gr numbers in different size models. It solves the experimental technique of large-area constant-temperature heat heating well, and also explores the realization of uniform flow and the reduction of flue gas diffusion. The experiment also obtains a very clear visualized photograph of the flow field in the model. Observations of the flow field in the two heat shrinkage ratio models show that the reasonable use of a downsized model of appropriate size can indeed eliminate the effect of gravity on flow and heat transfer on the ground.