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INVENTION
Patent of the Russian Federation RU2101557
ROTOR OF SAVONIUS TYPE WITH FULL SPARE PARTS
The name of the inventor: Soloviev A.P.
The name of the patent holder: Naval Academy named after Admiral of the Fleet of the Soviet Union NG Kuznetsov
Address for correspondence:
Date of commencement of the patent: 1994.07.28
Utilization: The invention relates to wind power and concerns rotors of the Savonius rotor type used in wind and hydraulic engines. SUMMARY OF THE INVENTION: The rotor comprises two hollow semi-cylindrical blades with generatrixes parallel to the axis of rotation of the rotor and end disks. Each blade is provided with an input longitudinal slotted confuser on the concave part and slots at the longitudinal ends for air outlet, the plane passing through the axis of rotation of the rotor coinciding with the surface of the blade far from the axis of the end, and for the nearest end the vertical plane perpendicular to the end passes In the middle of the slit of this blade and the slotted confuser of the other blade, the slots being perpendicular to the surface of the ends of the blades.
DESCRIPTION OF THE INVENTION
The invention relates to wind energy and concerns rotors of the Savonius rotor type used in wind and hydraulic motors and allows increasing the coefficient of wind energy use (water flow) and power of the rotor.
The Savonius rotor is known, which contains two hollow semicylindrical blades with generators parallel to the axis of rotation and end disks (author of the USSR 7167, IPK F 03 D 3/00, 1928 prototype). Disadvantages of the prototype: a relatively small coefficient of wind energy use and low power of the rotor of the specified dimensions.
To increase the energy efficiency of the flow and power of the rotor in the existing Savonius rotor containing two hollow semi-cylindrical blades with generatrixes parallel to the axis of rotation of the rotor, the end disks, each blade is provided with a longitudinal slotted confuser on the concave portion and slits at the longitudinal ends for air escape, The plane passing through the axis of rotation coincides with the surface of the blade far from the axis of the end, and for the nearest end the vertical plane drawn perpendicular to the end passes in the middle of the slit of this blade and the slot confuser of the other blade, the slits being perpendicular to the surface of the ends of the blades.
The proposed device differs from the prototype in that each blade has an inlet longitudinal confuser on the concave part of the blade and a slot at the longitudinal ends of the air outlet blade, the plane passing through the axis of rotation of the rotor coincides with the surface of the blade far from the axis of the end; A vertical plane drawn perpendicular to the end of the blade closest to the axis of rotation passes through the middle of the slit of this blade and the slotted confuser of the other blade. Slots at the ends are perpendicular to the surfaces of the ends of the blades.
The proposed device has elements of significant novelty.
From close analogs we consider (aut.sv.SSR 1270407, F 03 D 1/06, 1986).
Its design differences:
The analog for the air outlet is provided with openings at one end of the blade; in the claimed device, slits are made for the same purpose at both longitudinal ends of the blade;
At the analogue the input confuser is made separately from the blades, in the application each blade has its own confuser. The shape of the confusers differs: a round torus-like shape in the analogue and a slit in the application;
At the analogue, the air outlet holes are located to the axis of the confuser at an acute angle, the vertex of which is located on the side opposite to the confuser, in the application the slot is located perpendicular to the end surface and the plane passing through the axis of rotation of the rotor and the end surface for the blade removed from the axis of the end. For the blade end closest to the axis of rotation, the slot is directed to the middle of the confuser of the other blade.
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In Fig. 1 is a cross-sectional view of the proposed rotor. The rotor contains hollow semi-cylindrical blades 1, end disks 2, inlet longitudinal slot confusors 3 and slots 4 at the longitudinal ends of the blade 5. The rotor works as follows. Running on the blade 1 the flow bifurcates, part of it enters the confuser 3, the other acts on the concave lining of the blade, creating a torque. As the air moves through the cavities to the outlet slits 4 at the longitudinal ends 5, the flow rate increases. This is facilitated by the narrowing of the cross section of the blade to the ends and the centrifugal forces during rotation of the rotor. At the output of the slots, reactive forces and moments are created relative to the rotor axis. The flow of air from the slits of the end closest to the axis of rotation is directed into the confuser of the other blade, which increases the torque mainly by increasing the pressure in the rear of the blade coming towards the flow. |
We will evaluate the effectiveness of the claimed rotor. The forces of the action of the flow on the concave and convex sides of the semicylindrical blade in the form of an exact semicylinder are equal 
R and V 0 the density and flow velocity;
S 0 the diameter of the blade.
The torque for the arm l 0.4, where r 0 is the rotor radius, is equal to 
Here M o = r S o v o is the mass of the incident flow per second.
From the equation of angular momentum
M to v to - (M d v d cos <IMG SRC = "http://www.fips.ru/chr/945.gif" ALIGN = ABSMIDDLE> + M b v b cos b ) + P out = 0 ( 2)
We find the force P x, x, which falls on the walls inside the blade.
Here Mk and Vk are the mass of the flow entering the confuser and the flow velocity at the outlet from the confuser;
Md and Vd are the mass of the stream emerging from the far slot, and its speed:
M b and V b are the same for the near slot.
Assume that the actual value of the force P is x, is proportional to the relative width of the outlet part of the confuser. In the region of double skinning, the resultant surface forces will be taken equal to zero.
Then the torque on the rotor blade will be (Fig. 2): 
Let cos a » 1, cos b » 0.7, then we obtain 
We assume that 1/2 part of the flow enters the symmetrical confuser, where it accelerates to a velocity V to 2V 0 , and the exit velocity of the jet from the slot is V d V 4V 0 . The torque (4) will then be 
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Thus. For this particular case, the magnitude of the maximum torque of the rotor is 4.8 times greater than that of the prototype. Here, air supply to the rear part of the blades from the proximal slot to them is not taken into account, which will reduce the pressure difference on the blade from both sides and thereby reduce the blade resistance during rotation and increase the torque. When the blade is rotated from the position shown in FIG. 2, the air flow from the remote slot will serve as the wall of the jet confuser, increasing the volume of air entering the concave side of the blade. The device is easy to manufacture with high efficiency. Industrially applicable. |
CLAIM
A rotor of Savonius type with hollow blades, comprising two hollow semi-cylindrical blades with generatrixes parallel to the axis of rotation of the rotor, and end disks, characterized in that each blade is provided with an inlet longitudinal slotted confuser on the concave portion and slots at the longitudinal ends for air outlet, , Passing through the axis of rotation of the rotor, coincides with the surface of the blade far from the axis of the end, and for the nearest end the vertical plane perpendicular to the end passes in the middle of the slit of this blade and the slot confuser of the other blade, the slits being perpendicular to the surface of the ends of the blades.
print version
Date of publication 02.04.2007gg
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