base drag

base drag

[′bās ‚drag]
(fluid mechanics)
Drag owing to a base pressure lower than the ambient pressure; it is a part of the pressure drag.
References in periodicals archive ?
13], have suggested that the drag rise with yaw is entirely due to the increase in base drag.
135 m, however, drastically changes the magnitude and the relative contributions of the drag coefficient as can be seen in Figure 9: the frontal drag increased due to flow separation and loss in suction at the edges and a slightly lower base drag contribution resulting in a drag coefficient of 0.
At this point you still have two to four pounds of base drag, allowing the permit to escape from predators when you release your two fingers from touching the spool.
The main cause for drag increase is the base drag caused by the pressure distribution in the trailing edge (wake pressure recovery), but the discrepancy in the drag increase between the methods is caused by the smaller surface drag produced by the lower mean camber of the cutting off method.
Tanner [22] studied methods for reducing base drag in flatback airfoils using different trailing edge forms including 2D and 3D devices.
It was denoted that at the tail of the model, the faintish separate had already appeared, so the base drag became increased.
So the base drag of smooth surface model was larger than that about non-smooth surface model.
Base drag at the tail results from the bullet's wake; a tapered heel or boattail bullet minimizes base drag but is of little practical advantage for hunting inside 300 yards.
Typical passive methods such as side tapering [4,5], roof tapering [4,6, 7, 8, 9], roughness strips [10] and underbody tapering [11,12] have all been shown to result in base drag reductions.
The Effect of Backlight Aspect Ratio on Vortex and Base Drag for a Simple Car-Like Shape," SAE Technical Paper 2008-01-0737, 2008, doi:10.
Summary: TEHRAN (FNA)- US government officials began contacting attorneys of Guantanamo Bay inmates who are being force-fed as the hunger strike on the prison base drags past the two-month mark.