Quote:
Originally Posted by kach22i
Nov. 30, 2012
Common Research Wind Tunnel Model with a Particle Image Velocimetry Plane
https://www.nasa.gov/centers/ames/or...1600-1200.html
I'm just not seeing it.
Perhaps the visualization is too rapid and meant for photo sensors and not the human eye, or at least the eye of a traditional digital camera ( or what ever they used here)? |
All the streamline filaments passing the model are isoenergetic.They contain the same amount of energy,whether in pressure or velocity,or any combination of the two.
With smoke,any particular filament could be analyzed by measuring the velocity of entrained air molecules as they pass by the model.From Daniel Bernoulli's theorem,they could know the air pressure at any point around the model,based upon the local air velocity vector.
Turbulence,if present,would have it's own velocity/pressure anomaly.
Any three lasers chosen,would act as theodolites,capturing the dynamic vector history of a particle,fixing,through trigonometry,range and location at any given point,much as global positioning satellites can fix the position of your cell phone.