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2. High-volume low-speed fan - Wikipedia

   en.wikipedia.org/wiki/High-volume_low-speed_fan

   A High-volume low-speed fan. A high-volume low-speed (HVLS) fan is a type of mechanical fan greater than 7 feet (2.1 m) in diameter. [1] HVLS fans are generally ceiling fans although some are pole mounted. HVLS fans move slowly and distribute large amounts of air at low rotational speed– hence the name "high volume, low speed."

3. Centrifugal fan - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_fan

   A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel).

4. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

5. Prandtl–Meyer expansion fan - Wikipedia

   en.wikipedia.org/wiki/Prandtl–Meyer_expansion_fan

   The figure shows one such ideal expansion fan. A supersonic expansion fan, technically known as Prandtl–Meyer expansion fan, a two-dimensional simple wave, is a centered expansion process that occurs when a supersonic flow turns around a convex corner. The fan consists of an infinite number of Mach waves, diverging from a sharp corner. When a ...

6. Hypersonic speed - Wikipedia

   en.wikipedia.org/wiki/Hypersonic_speed

   Chemically reacting flow can also cause corrosion of the vehicle's skin, with free-atomic oxygen featuring in very high-speed flows. Hypersonic designs are often forced into blunt configurations because of the aerodynamic heating rising with a reduced radius of curvature. — 53T6 (Mach 17) HTV 2 (Mach 20) Agni-V (Mach 24) DF-41 (Mach 25 ...

7. Shenyang WS-20 - Wikipedia

   en.wikipedia.org/wiki/Shenyang_WS-20

   The Shenyang WS-20 (Chinese: 涡扇-20; pinyin: Wōshàn-20; lit. 'turbofan-20') is a high-bypass turbofan aircraft engine designed by the Shenyang Aeroengine Research Institute for the PLAAF's Y-20 family of strategic airlifters, it is currently installed in limited numbers.