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为解决常规风洞雷诺数模拟不足的问题，采用低温风洞已被证明是一条可行的途径。目前世界上几乎所有运转的低温风洞都是采用液氮气化吸热方法来降低和保持试验气体的温度。对于大型低温风洞，这种制冷方案存在着运转费用高昂和环境污染的缺点。为克服上述缺点，俞鸿儒院士提出了一种用空气作试验气体，藉热分离器制冷并回收排气冷量的新型低温风洞的概念。此原理性风洞的研制就是要从其基本原理、设计特点及实验结果等方面来验证和探讨这种新概念的可行性和应用前景。
In order to solve the problem of the conventional wind tunnel Reynolds number simulation, the adoption of low temperature wind tunnel has proved to be a feasible way. Nearly all low-temperature wind tunnels in operation in the world use liquid nitrogen gasification to reduce and maintain the temperature of the test gas. For large low-temperature wind tunnel, this refrigeration program has the disadvantage of high operating costs and environmental pollution. In order to overcome these shortcomings, Yu Hongru academician proposed a new type of low-temperature wind tunnel that uses air as the test gas, and uses a hot separator to cool and recover the exhaust cooling capacity. The development of this principle wind tunnel is to verify and explore the feasibility and application prospect of this new concept from its basic principles, design features and experimental results.