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What are the effects on the air flowing over aerodynamic surfaces when travelling at subsonic and supersonic speeds?
Wiki User
∙ 15y ago
At subsonic speeds air acts like a fluid and Bernoulli's principals apply,
at supersonic speeds, air acts like a gas (it's compressed). At subsonic speed, air speed increases with a decrease in area and vice versa. Above the sound barrier, air speed decreases with a decrease in area. This does not seem logical or intuitive. As the subsonice air flow through test chamber at near speed of sound and the area decreases at the nozzle, the airflow increases and a shock wave developes. Aft of the shock wave, the air is now supersonic. Then as the nozzle opens wider, the flow continues to increase in speed until a time when the pressure is insufficient to support the flow---then another shock waves developes as the flow drops back to sub-sonic.
Wiki User
∙ 15y ago
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