Search results
Results from the WOW.Com Content Network
A sample wind tunnel layout showing some typical features including a test section and control room, a machine for pumping air continuously through ducting, and a nozzle for setting the test airspeed. A wind tunnel is "an apparatus for producing a controlled stream of air for conducting aerodynamic experiments". [1]
A fog machine, fog generator, or smoke machine is a device that emits a dense vapor that appears similar to fog or smoke. This artificial fog is most commonly used in professional entertainment applications, but smaller, more affordable fog machines are becoming common for personal use. Fog machines can also be found in use in a variety of ...
Colored oil applied to the surface of a wind tunnel model provides one example (the oil responds to the surface shear stress and forms a pattern). Particle tracer methods: Particles, such as smoke or microspheres, can be added to a flow to trace the fluid motion.
Flow around a sphere being visualized by seeding the flow with smoke. Visualization of hairpin vortex structure, made visible by seeding the flow with colored dye. Seeding is a fundamental technique in fluid dynamics. It is used to visualize and measure fluid flow. Researchers introduce small particles, called seed particles, into a fluid.
The first human to fly in a vertical wind tunnel was Jack Tiffany in 1964 at Wright-Patterson Air Force Base located in Greene and Montgomery County, Ohio.. In 1982 Jean St-Germain, an inventor from Drummondville, Quebec, [2] sold a vertical wind tunnel concept to both Les Thompson and Marvin Kratter, both of whom went on to build their own wind tunnels.
The smoke kills by a combination of thermal damage, poisoning and pulmonary irritation caused by carbon monoxide, hydrogen cyanide and other combustion products. Smoke is an aerosol (or mist) of solid particles and liquid droplets that are close to the ideal range of sizes for Mie scattering of visible light. [5]
The fluid flow in the driven gas can be used much as a wind tunnel, allowing higher temperatures and pressures therein [18] replicating conditions in the turbine sections of jet engines. However, test times are limited to a few milliseconds, either by the arrival of the contact surface or the reflected shock wave.
The cross section of the tunnel is 8.2 feet (2.5 m) high and 8.2 feet (2.5 m) wide. Unlike full-scale wind tunnels, the NTF can adjust airflow to match any model size down to 1/50 scale. The facility can operate at temperatures ranging from -250 ° F to + 150 ° F. [ 1 ] To achieve lower than ambient temperature, liquid nitrogen is sprayed into ...