{"id":5615,"date":"2020-02-10T01:34:45","date_gmt":"2020-02-10T00:34:45","guid":{"rendered":"https:\/\/www.presticebdt.com\/?p=5615"},"modified":"2023-09-23T13:36:13","modified_gmt":"2023-09-23T11:36:13","slug":"wind-tunnel-types","status":"publish","type":"post","link":"https:\/\/www.presticebdt.com\/fr\/wind-tunnel-types\/","title":{"rendered":"Combien de types de souffleries existe-t-il ?"},"content":{"rendered":"

Combien de types de souffleries existe-t-il ?<\/h1>\n

What is and which is the difference between wind tunnel types<\/h2>\n

What is a wind tunnel?<\/h3>\n

Wind tunnels<\/strong> are large tubes in which the air flows, simulating the actions of an object flying through the air or moving along the ground. We use wind tunnels to test scale models<\/strong> of aircraft, spacecraft, cars and motorbikes. Some wind tunnels are large enough to contain full-size<\/strong> versions of vehicles or just any part of it. In this article, we’ll treat the wind tunnel classification and their principal components.<\/p>\n

\"Aprilia<\/a>

Windtunnel: APRILIA GUZZI<\/p><\/div>\n

Why are wind tunnels so important?<\/h4>\n

The possibility of carrying out tests in the wind tunnel is based on the so-called \u201creciprocity principle<\/strong>\u201d, which states that from the point of view of the value of the physical quantities that are measured and the flow rate on the body<\/strong>, it is indifferent to move a body in a fluid stationary or move the fluid around a stationary body. So, instead of the air standing still and an object moving at speed through it, the same effect would be obtained if the object stood still and the air moved at speed past it. In that way a stationary observer could measure the aerodynamic forces being imposed on it.<\/p>\n

The earliest wind tunnels were invented towards the end of the 19th century, in the early days of aeronautic research, when many attempted to develop successful supersonic aircraft and missiles.<\/p>\n

Later, wind tunnel study came into its own: the effects of wind on man-made structures<\/strong> or objects needed to be studied when buildings became tall enough (like skyscrapers) to present large surfaces to the wind, and the resulting forces had to be resisted by the building’s internal structure. Determining such forces was required before building codes could specify the required strength of such buildings and such tests continue to be used for large or unusual buildings.<\/p>\n

\"wind<\/a><\/p>\n

Which is the relation between wind tunnel tests and CFD (computational fluid dynamics)?<\/h4>\n

Still later, wind tunnel testing was applied to automobiles<\/strong>, not so much to determine aerodynamic forces per se but more to determine ways to reduce the power required to move the vehicle on roadways at a given speed. In these studies, the interaction between the road and the vehicle plays a significant role, and this interaction must be taken into consideration when interpreting the test results. In an actual situation the roadway is moving relative to the vehicle but the air is stationary relative to the roadway, but in the wind tunnel the air is moving relative to the roadway, while the roadway is stationary relative to the test vehicle. Some automotive-test wind tunnels have incorporated moving belts under the test vehicle in an effort to approximate the actual condition, and very similar devices are used in wind tunnel testing of aircraft take-off and landing configurations.<\/p>\n

The advances in computational fluid dynamics (CFD<\/strong>) modelling on high-speed digital computers has reduced the demand for wind tunnel testing. However, CFD results are still not completely reliable and wind tunnels are used to verify CFD predictions<\/strong>.<\/p>\n

\"CFD<\/a>

CFD Correlation and Windtunnel<\/p><\/div>\n

Two main wind tunnel types: open and closed circuit.
\n<\/strong><\/h3>\n

Wind tunnels are divided into two main categories:<\/p>\n