Overview
ViGYAN's Low Speed Wind Tunnel
Ambient air is drawn through an inlet cage lined with densely woven filter material, which also serves to suppress external wind disturbances. The flow passes through a screened honeycomb, a long settling chamber, three woven, seamless, anti-turbulence screens and, finally, a nine-to-one contraction, before being discharged into the test chamber as a highly uniform, rectangular, cross-section jet four feet in width and three feet in height.
After traversing a five-foot length, the jet is collected by a bell-mouthed diffuser, conveyed through the fan and exhausted to atmosphere. These flow-conditioning measures reduce the turbulence level at the model position to less than 0.1 percent. Sphere tests have established the turbulence factor to be under 1.05.
The walk-in test chamber surrounding the test jet is large enough to accommodate two or three observers, with ear protection the only requirement. The free-jet configuration allows instant access to the model and facilitates flow visualization and photography from a variety of viewpoints. Alternate wall configurations (e.g., solid, semi-open, ground board, etc.) can be readily installed for special test requirements.