Subsonic Wind Tunnel

Visão geral

A subsonic wind tunnel refers to a wind tunnel with an airflow Mach number ranging from about 0.4 to 0.8 in the test section, and the lower limit of the Mach number can also be as low as 0. The structure of the subsonic wind tunnel is similar to that of the recirculation low-speed wind tunnel, and the power of the driving fan is larger than that of the low-speed wind tunnel of the same size. High cooler or ventilator. There are not many such wind tunnels in the world, and most of them were built before the birth of transonic wind tunnels and trisonic wind tunnels (wind tunnels operating in sub-, trans- and supersonic speeds). Cooling Issues in Subsonic Wind Tunnels The freezing problem of subsonic wind tunnel is a very important problem in wind tunnel design. When the wind tunnel is working normally, all the energy supplied to the wind tunnel by the power unit is converted into heat energy through friction, separation, etc. In addition to a part of this heat energy being transferred to the surrounding environment, the temperature of the wind tunnel airflow and the tunnel equipment will be increased until an equilibrium temperature is reached. If you do not manage to dissipate this heat, the temperature will increase over time and reach a very high equilibrium temperature. This has a very adverse effect on both the wind tunnel and the test. These impacts mainly include the following aspects: (1) If other test conditions remain unchanged, the increase in temperature will increase the viscosity coefficient of the air, thereby reducing the Reynolds number of the test, and even causing the flow state near the model to change. (2) Excessive test temperature will soften the material used to temporarily fill the shape on the surface of the model, such as wax, thus changing the shape of the model.

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