Abstract
The study analyzes main ways of air flow cooling in closed-circuit wind tunnels (subsonic and transonic): subject to air exchange (continuous partial exhaust of warm air and its change for colder outside air) and by means of the use of liquid-coolant stationery heat exchanger. It is shown that additional equipment is not required when applying air exchange to cool the flow and, in general, it can reduce costs of wind tunnel maintenance and, consequently, test prices. Based on an example of subsonic wind tunnel designed in TsAGI the evaluation of gas-dynamic and thermo-dynamic circuit flow properties are evaluated. The study also proposes options of air exchange arrangement for high-power operations at w=160 ms-1 in closed test section provided that the outside air temperature is Tf=20 °C. The paper represents the results of numerical simulation for air flow in the segments of wind tunnel duct in presence of air exchange holes.
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