Quote:
Originally Posted by jeff88
Aerohead (or anybody), can you help me with what the images mean, I have never tried breaking down a cD image before.
I just happened to have bought a CO alarm for my new house (laundry closet is in hallway directly across from my bedroom and there is a gas dryer) and I haven't installed it on the wall yet, so I may put it in the truck while not doing laundry/in the house.
Now I just need to get this rear window fixed, so I can try this mod out!  |
I'm struggling to 'believe' the software's isobaric interpretation.
The image does not appear to do a proper accounting of velocity pressure vs body location.
The thing to bear in mind is that around the side-view mirrors,the air has achieved its maximum velocity and lowest pressure.
With a squareback,these velocities pretty much remain constant until the trailing edges of the body where it breaks away.
*with the window down you destroy the flow support surface and the air must flow into the void.
*This destroys the flow behind the window.
*The lowest pressure is at the side mirrors.
*The pressure behind the vehicle is higher than at the side-
view mirrors.
*If you open the window and backlight,air will flow from back to front.It's got to,based upon the pressure differential.
*This counter-flow triggers shearing forces which generate vortices which rob power.
*Attempting to use the cabin as a duct forces air to flow within an extremely
high-drag inner wall boundary of tremendous surface roughness,not to mention everything within the 'duct.'(seats,headrests,shoulder belts,etc.)
*The interior flow steals kinetic energy from the exterior flow,giving it no chance for any pressure recovery in the wake region.
* In an aircraft,the only reason you'd use a duct,is to channel air to the embedded engine,who's tailpipe and or fans develop a net thrust propulsion.