Under the influence of the water flow, each blade 150 oscillates within its channel 124 a, 124 b between extreme positions wherein its flap 184 is adjacent to the bed sections B2-B4 at opposite sides of its channel. Since the Magnus rollers start out at zero angular velocity at their TDC and BDC positions during each half cycle, there is always a portion of the cycle where this force is zero or slightly negative, but fortunately this can be arranged, by careful attention to gear ratio and roller diameter design details, to be during that part of the cycle when the blade output torque is getting its maximum boost from the powerful Wind/Water Hammer effect, which is also the portion of the cycle when the drag force itself is making its maximum positive output torque contribution.
Dolor Muscular Sin Fiebre
The chamber 74 b volumes on opposite sides of piston 74 a are connected by pipes 76 a and 76 b, respectively, to the two fluid channels of a spring biased, two position solenoid, fluid or mechanically-operated valve 78 which may be part of a module 80 preferably contained within main body 66. Those two channels of valve 78 are also connected to a pair of pipes 80 a and 80 b.
The crank case assembly 230 design may also be used in the other described embodiments of my apparatus. FIG. 20C is a graph illustrating the relationship between wind speed and blade Coefficient of Lift that can be produced by apparatus using Magnus rollers, such as the FIG. Since that speed is, of course, the same for all sizes of wind or water machines, the above ratio dictates that larger machines have an easier time of meeting the required ratio, or conversely that smaller machines have to cycle faster in order to achieve the required ratio in order for the machine to generate the forces enabling it to work. One unique feature of machines equipped with Magnus rollers is that, unlike the situation with conventional windmills, wind gusts are generally nonevents as the CL decreases with increasing wind speed. The presence and actions of the flap are the main initiators of these important Venturi forces; machines without them are not as efficient, nor are their usual controls as flexible to changing loads.
For operation in tidal flow applications, it may be desirable to lower dam 12 to let the tide reverse flow into a holding bay behind the machine and be released later in the normal direction in a controllable way to generate the electricity in the amount and at the time desired. 20C. Actually, I have found that SR/SW must be greater than about one half in order for it to generate a positive “Magnus Effect lift” force, and that the coefficient of lift, CL, due to this force is proportional to 2π (SR/SW−0.5), whereas the “CL for a conventional aerofoil is 2π times the sine of the angle that the apparent wind or water makes with the blade’s chord which is usually not more than about 12°, i.e. When the signal to valve 78 ceases, the valve returns to its home position so that high pressure air is applied to cylinder 74 b so as to extend the piston 74 a.
Similarly, when the blade 20 with its now downwardly angled flap approaches its TDC position in that figure, cam 88 will again close switch 82 or is equivalent causing valve 78 to momentarily retract piston 74 a. 74 b on one side of piston 74 a or the other side thereof resulting in the actuator 74 switching between an extended position and a neutral position. Of course, similar results could be achieved with a “wing warping” design such as the Wright Brothers used on their FLYER airplane, mimicking the natural motion of the body and tail of a fish; we chose to describe our invention using the word “flap” for clarity, but a one piece “warped wing” design could accomplish the same objectives perhaps more efficiently. 6-13, but it is redundant. 1 and 2, apparatus 10 comprises an articulated blade or vane 20 which may have the general shape of a symmetrical aircraft wing.
As shown in these figures, the leading edge bracket 226 a of the vertical vane 226 is connected between the upper and lower tubes 240 b at the rear of the housing at a location therealong that centers the vane between the two blades 224. Preferably, bracket 226 a of the vane is pointed or streamlined as shown so that the trailing edges of the oscillating blades 224 can use it as their TDC boundaries, i.e. Corresponding first ends of the ribs in the two arrays are connected to bracket 226 a while corresponding second ends of the ribs in both arrays are connected to a single vertical rib 226 c spaced an appreciable distance from housing 220. The ribs 226 b and 226 c are covered by a taut skin 226 d of a strong, flexible, weather resistant material such as Dacron polyester or other similar sheet material. Dolor en la parte posterior de la espalda . A mirror image of that structure is connected to the lower set of straps 240 c of the housing skeleton.
- Experimentar la realidad de la pérdida
- Ejercicios para aumentar la movilidad, fortalecer y mejorar la función del hombro
- Frutos secos y semillas
- Daño cardíaco y pulmonar
14B. Housing 220 supports a pair of similar, spaced-apart, vertically oriented blades 224. The blades are pivotally mounted with their leading edges 224 a facing the housing entrance 220 a so that the blades can oscillate side to side. Blade 20 has a leading edge 20 a along which extends a shaft 24 whose opposite ends are journalled in bearing blocks 26 a and 26 b supported on the land L on opposite sides of the river such that blade 20 spans the river with its leading edge 20 a facing upstream. At the same time that this low pressure condition is occurring on these bottom surfaces, the top surfaces of the blade are experiencing progressively higher pressures for the opposite reason because the gap between the top of the blade 20 including flap 68 and the water’s surface or opposite boundary is progressively increasing at this time and in this region causing the flow over the top surface as it passes the leading edge to slow down, resulting in higher surface pressures.
3. The constant rotational velocity crank mechanism, causes the blade to rotate fastest at mid-cycle and to slow down for the turns at TDC & BDC. Consequently, the normally applied Bernoulli and Euler equations do not predict the work energies that can be extracted from these flows by this machine, as these equations predict that these energies should be zero. The gear box 42 drives a conventional electrical generator 44 so that the generator generates useful electrical power. None of these large conventional hydro-electric power generators are suitable for operating in the shallow waters found in most rivers and tidal flows. The upswitching flap 68, combined with the upriver fluid momentum, causes a linear fountain to momentarily appear from river bank to river bank, which is good for aeration of the water and for stunning visual effects. The interior of dam 12 is connected by a pipe 13 to a compressed air source 14, the flow of air through pipe 13 being controlled by a remote controlled valve 16. In order to increase the level of the water W over the bed B2, the valve 16 is operated to connect source 14 to dam 12 so that the dam inflates and swings up to its solid line position shown in FIG.
Also, the crank centerline C/L, parallel to the base of this triangle, should pass through the link/blade connections 163 as shown in FIG. 5. Accordingly, the blade 150 shown in FIGS. Apparatus such this is shown generally at 120 in FIGS. Correr dolor de rodilla . Although a closed system with only one large channel through housing 122 is possible, dual channels are generally preferred to mechanically balance the oscillating blades 150 as well as to maximize the energy recovery through the draft pipes 134, if they are used, and to minimize reduction of the power recoverable from the apparatus due to turbulence. In other words, flap 68 is a bistable member which is toggled from one position to the other only when blade 20 is either near its TDC or its BDC position.
Yet another object is to provide a method for generation power having one more of the above advantages. 20 functions in the same way, out of phase with the first-mentioned blade; two out of phase blades are desired for mechanical balance just as nature does with its designs that fly through the atmosphere.