The advantages of closed circuit wind tunnels are that the fan blades are less vulnerable to damage. The noise is lower and the particle being tested can be easily contained. Outside air movements like air vents don't affect the wind tunnel. The power requirement for a given speed is lower. The air entering the test section is also free of debris.
The disadvantages are that the cost for these types of wind tunnels are significantly higher compared to the open circuit wind tunnels. The recycled air supply can be disastrous when working with combustion engines. It requires more space as these tend to be a bit bigger. The increeasing air pressure can be an issue during prolonged use.
The disadvantages are that the cost for these types of wind tunnels are significantly higher compared to the open circuit wind tunnels. The recycled air supply can be disastrous when working with combustion engines. It requires more space as these tend to be a bit bigger. The increeasing air pressure can be an issue during prolonged use.
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