Applications of Circulation Control Technologies by Joslin, Ronald D.; Jones, Gregory S.(eds.)

By Joslin, Ronald D.; Jones, Gregory S.(eds.)

According to papers from the 2004 NASA/ONR stream keep watch over Workshop, this assortment is a useful, specific source at the cutting-edge in move keep watch over applied sciences and purposes. Filling the data hole among 1986, while the final such symposium was once held, and this present day, it summarizes the functions, experiments, computations and theories relating to circulate regulate, emphasizing primary physics, structures research and utilized study. The papers provided conceal a large choice of aerodynamic and hydrodynamic purposes together with; naval autos, fixed-wing aviation, V/STOL systems, propulsion platforms, and flooring vehicles.
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Figure 21 shows a drawing of the 86 R. IMBER, E. ROGERS, AND J. ABRAMSON Fig. 20 Circular wing model with full perimeter circulation control. centerline cross-section with surface pressure tap locations. 032 in. The major configurations investigated are shown in Fig. 22. The circular icons represent a planform view of the Disc with the shaded sections representing the perimeter sections where fluid ejection occurred. In Fig. 22, the free-stream flow would be directed from the top to the bottom of the page.

That is why Fig. 22 shows negative drag recorded with blowing. This is accounted for in the equivalent drag term, LID,,, where C, is included (see Ref. 10 for a more detailed explanation). Additional benefits of blown CC airfoils at speeds up to transonic were shown in the compressible flow tests of Ref. 40, where blowing was seen to produce a very favorable boundary layer/shock interaction, drag reduction, and increased Cl (Fig. 23). The second approach to the drag problem was a simple CCW flap with a curved upper surface and a sharp trailing edge (Fig.

29. The typical 15 moving elements per wing were replaced with the CCW single element flaps and LE blowing, yielding perhaps a maximum of three components per wing (the outboard CCW flap became the aileron, and blowing differentially on the CCW flap replaced the spoilers for roll). Using only fan bleed air (and the associated lower thrust lost), replacing the conventional flaps with CCW was able to triple the usable lift at takeoff and produce the ground roll reductions shown in Fig. 30. For lighter aircraft weights, blown takeoff rolls of 400-500 ft are possible with 0 kn headwind, about a third that of the conventional aircraft; with a 20 kn headwind (wind over deck), 200-300 ft Chapter 3 Exploratory Investigations of Circulation Control Technology: Overview for Period 1987-2003 at NSWCCD Robin Imber* Naval Air Systems Command, Patuxent River, Maryland and Ernest Rogerst and Jane Abramsont Naval Sur$ace War$are Center-Carderock Division, West Bethesda, Maryland Nomenclature A = area of CC slot, or area of foil planform AR = aspect ratio C, = momentum coefficient of slot flow (rizvj/qS) CL = lift coefficient ( L / q S ) C, = drag coefficient ( D / q S ) C, = power coefficient CT = thrust coefficient c = chord length D = drag force d = diameter, or camber line offset h = CC slot exit height (gap) L = lift force rit = mass flow (pAV) PR = pressure ratio q = dynamic pressure (&pV2) S = planform area of lifting surface t = thickness of airfoil *Aerospace Engineer.

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