Pickup Tail Gate Up or Down... A Scientific Explanation
More info with a scientific basis... is it the last word?
Journal of Wind Engineering and Industrial Aerodynamics Volume 98, Issue 2, February 2010, Pages 100-112 Experimental study of a pickup truck near wake Abstract The present study focuses on the aerodynamics of pickup trucks. The flow about a generic pickup truck has been documented experimentally. The main objective is to gain a better understanding of the pickup truck aerodynamics through mean and unsteady pressure measurements as well as detailed flow field measurements using particle image velocimetry (PIV). Of particular interest and complexity are the symmetric and asymmetric separated vortex flows which develop behind the cab and the tailgate. A secondary objective is to obtain a comprehensive experimental data set for validation of computational fluid dynamics (CFD) models. The experiments were conducted at Reynolds numbers in the range of 5– 8.5×105 in an open return wind tunnel equipped with two-frame digital PIV system. The mean pressure results of the pickup truck show that the pressure outside the tailgate is higher than inside the tailgate suggesting that the tailgate reduces aerodynamic drag. The root-mean-square (rms) values of pressure fluctuations at the cab back is very low and increases significantly towards the back of the bed and the tailgate top edge. Pressure fluctuation spectra indicate a spectral peak at a Strouhal number of 0.07. Velocity field measurements of the near wake flow show a relatively quiet region behind the cab and no recirculating flow region in the symmetry plane behind the tailgate. Instead there is a strong downwash at the symmetry plane behind the tailgate. This downwash is due to the existence of a pair of counter-rotating vortices downstream of the tailgate. The downwash promotes attached flow behind the tailgate, thus resulting in a pressure recovery that reduces drag. From: ScienceDirect - Journal of Wind Engineering and Industrial Aerodynamics : Experimental study of a pickup truck near wake |
Well then, there you go. That explains a lot.:rolleyes:
|
Another damn paywalled article!
|
Quote:
Maybe this will help... http://ecomodder.com/forum/showthrea...er-up-543.html Jim. |
Quote:
the entire study. I was unsuccessful. However, I did find that a one year, 12 issue subscription to The Journal Of Wind Engineering & Industrial Aerodynamics costs a mere ... $3628.37. :eek: I am at a loss to understand the business plan on this. :confused: OK, LOTF is an appropriate response: :p Quote:
Thank you. I searched EM before starting this thread and found that one. Because this study has a different point of origin and a different methodology, I feel it deserves to be considered on it's own. |
If it costs that much, it must be valid...:rolleyes:
|
more
Quote:
Please someone,buy them a window and show them how to use a search engine on the internet. |
All times are GMT -4. The time now is 07:09 AM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com