Aerodynamic modification

Measurements on aerodynamic sizes of atmospheric aerosols and associated radionuclides were carried out with Anderson 2000, Inc., 1-ACFM Ambient Impactors with or without the Anderson low-pressure modification, as well as with Sierra model 236 (six-stage) high-volume impactors (HVI). The 1-ACFM design operated at 28... 

Further modification of the FAE-II bomb is presented by Miller (Ref 3). This report describes an aerodynamic decelerator as follows Applying a Ram Air Inflatable Decelerator (RAID) as the aerodynamic decelerator system to meet the air-delivery requirements for the 2000-lb fuel air explosive (FAE) bomb. The delivery approach considered is to allow the bomb to free-fall in an unretarded configuration until it reaches the vicinity of the target. At this... 

Once new droplets are created, the product droplet velocity is computed by adding a factor Wbu to the primary drop velocity. This additional velocity is randomly distributed in a plane normal to the relative velocity vector between the gas phase and parent drop, and the magnitude is determined by the radius of the parent drop and the breakup frequency, wbu = ru. This modification of newly formed droplets follows the physical picture of parent droplets being tom apart by aerodynamic forces giving momentum to the newly formed droplets in the direction normal to the relative velocity between the gas phase and parent drops [17]. As new droplets are formed, parent droplets are destroyed and Lagrangian tracking in the physical space is continued till further breakup events. 

When air flows across a shoreline, its boundary layer undergoes significant modification in aerodynamic rough-... 

Synthetic jets have attracted significant interest in recent years due to their potential application in flow control (see Fig. 4), in particular performance control of aerodynamic surfaces through fluidic modification of their apparent aerodynamic shape. Application of synthetic jets can move the local streamlines in the vicinity of a synthetic jet and cause an apparent modification in the shape of the boundary. Such shape modifications are often achieved by operating a synthetic jet at timescales that are below the characteristic time scales of the mean flow. Synthetic jets are also employed for forced cooling of electronic devices, steering mechanism for capsule endoscopy, thrust generation, and jet noise reduction, among others. 

It should be noted that many of the issues can be dealt with an improved design or stmctural modifications. This is the case, for example, for flutter- and vortex-induced vibration suppressions on bridge deck, obtained by means of section modifications or aerodynamic countermeasures (e.g., deflectors, fairings, and flaps). Similarly, an appropriate designed cable cross section and surface can minimize cable vibration. 

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