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The wind tunnel is used to study the flow of air through solid objects. The air is blown Or pumped through pipes to the wind with the object under test. And means for observing or measuring equipment is installed. Most popular measure vibration of the building. The test object is equipped with a sensitive balance to measure the force generated by the air stream; Or air currents may smoke or other substances that are injected to the flow can be seen around the aircraft or vehicle as large as the real test, as some of the large wind tunnel. However, these facilities are expensive to operate, and some of these functions can be used, rather than by computer modeling.
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