Download PDF by R. Joslin, G. Jones: Applications of Circulation Control Technologies, Volume 214
By R. Joslin, G. Jones
According to papers from the 2004 NASA/ONR movement keep an eye on Workshop, this assortment is a useful, unique source at the state of the art in circulate keep an eye on applied sciences and purposes. Filling the knowledge hole among 1986 -- whilst the final such symposium used to be held -- and this present day, it summarizes the purposes, experiments, computations and theories relating to flow regulate, emphasizing primary physics, structures research and utilized examine. 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.Anyone with pursuits in utilized aerodynamics, fluid mechanics and plane layout will locate this ebook of specific worth, as will these looking a an up to date reference paintings on flow keep an eye on and its many present purposes.
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Additional info for Applications of Circulation Control Technologies, Volume 214 (Progress in Astronautics and Aeronautics)
3 Maximum lift of blown circulation control airfoils. R. J. ENGLAR 28 expansion to the actual static pressure just outside the jet slot would yield higher calculated values of vj and thus C,, but would vary as the external flow conditions or shape changed, so would be hard to duplicate as a universal design parameter. " Before going any further, please note that there is nothing that prohibits the jet velocity from being supersonic unless the geometry is such that a shockdown back to subsonic flow causes the jet to detach from the curved surface.
This paper concentrates primarily on fixed-wing aircraft, but CC is certainly not limited to that application alone. The following examples will confirm the multiple uses of CC devices as the following: 1) aerodynamic force and moment augmentors (Fig. 1 shows ACL/CIL= 80, or 8000% return on the invested momentum); 2) aerodynamic force and moment reduction if/when needed (drag in climb out and cruise); 3) aerodynamic moment control and stability augmentation; and 4) aerodynamic device simplifier (moving parts elimination, complexity and weight reduction).
The X-wing avoids this problem at high speeds by employing CC on each end of the blade (Fig. 12), and a “clever” control system can blow whichever slot is currently on the airfoil’s trailing edge. Thus, the airfoil never experiences flow from the “wrong” direction. The entire system can be simplified even further by use of simultaneous blowing from both leading and trailing edges of the double-ended airfoils24 (Fig. 12, right). Note that even if the flow is coming from the wrong direction (dashed curve), the dual-slotted airfoil still yields 80-90% of the single-slotted airfoil’s lift, even when the leading edge is counter the conventional direction (compared to little, zero, or negative lift from a conventional airfoil).
Applications of Circulation Control Technologies, Volume 214 (Progress in Astronautics and Aeronautics) by R. Joslin, G. Jones