Method of fluid medium power take-off

FIELD: engines and pumps.

SUBSTANCE: invention relates to water- and wind-power engineering, particularly to the devices converting fluid flow energy, for example that of rivers, ebb-tide and other streams, as well as wind power into electrical or mechanical power to drive various machinery. The proposed method consists in that a funnel is submerged into fluid medium to take it off and to direct to, for example a turbine. The aforesaid funnel features a bulbous shape on the side of in coming fluid flow. The funnel inlet area-to-outlet area ratio exceeds the ratio between the inlet fluid flow speed and flow boundary speed. Note that with the flow boundary speed further increase dynamic head decreases. Passing out from the funnel, the fluid flow is distributed among several turbines allowing for its power.

EFFECT: increased efficiency of fluid flow power take-off.

1 dwg

 

The invention relates to hydro - and wind energy, in particular to a device for converting energy of the current environment, such as rivers, tidal and other currents, as well as the energy of moving air masses in electrical or mechanical to ensure that drive consumers.

The closest to the technical nature of the claimed invention is a method of energy extraction in the current environment, which consists in the fact that in the current environment, immerse the funnel, and to divert the current environment, passing through the funnel, to a tool, such as turbine (SU 1810599 A1, 23.04.1993, F03B 13/42). The cowl is attached a conical shape.

The disadvantage of this method is the low utilization rate of energy flow of the current environment due to unsustainable hydrodynamic parameters of the socket.

The present invention is to increase the efficiency of energy extraction in the current environment.

The problem is solved in that in the known method of energy extraction in the current environment, which consists in the fact that in the current environment, immerse the funnel, and to divert the current environment, passing through the funnel, to the working body, such as the turbine, the cowl give a convex shape in the direction of the pass-through flow of the current environment, the ratio of the areas of the output and input openings of the bell perform a large ratio near the amount of flow at the inlet and boundary flow with further increase of which the dynamic pressure decreases, and after passing the socket depending on the energy of the current thread it is distributed between several working bodies.

Since the cowl attach convex in the direction of the pass-through flow form, then this reduces the resistance of the walls of the socket to the current flow, which reduces the loss of energy flow when it passes through the mouth and increases the utilization of its energy. Because of the square cross sections of the output and input openings of the socket charge, depending on the speed of flow and the critical fluid velocity, using a socket, you can effectively take away the energy of the current environment in a large range of fluctuations of flow rates. It also helps to increase the utilization of energy flow. The division of flow of flowing medium at the outlet of the funnel into multiple streams can reduce the sensitivity of the flow rate supplied into the working mechanisms of the speed of the input stream, which increases the utilization rate of flow of the current environment in the working bodies.

The invention is illustrated in the drawing, which shows a diagram of the proposed method.

In a moving environment on the ground 1 set the base 2 on which is fixed to the frame 3 with the capability, the capacity of the free rotation around the vertical axis. On the frame 3 is rigidly fixed socket 4, which gives a convex shape in the direction of the pass-through flow of the current environment. The plane of the inlet socket is located at a distance from the axis of rotation of the frame 3. Outlet socket 4 through the clutch 5 is connected with the pipe 6, which carries the moving environment to the operating body 7.

Under the action of flow (in the drawing shown by the arrow) socket 4 together with the frame 3, to freely rotate around its axis, is always set towards the stream environment. As the flow inside the socket 4 from the inlet to the outlet by reducing the cross-sectional area of the funnel the flow velocity increases and the output from the cowl gets the greatest value. After exiting socket stream enters the coupling 5 and later in the pipeline 6. On the pipe 6-speed stream is routed to a destination, for example, in the working bodies of water turbine 7. Depending on the energy of the current thread he may be directed to a single turbine or be distributed between two, three or more actuators. This increases the utilization rate of energy flow.

It is known that in accordance with the law of continuity of flow, the flow velocity V (m/s) in an arbitrary cross section of the socket will be equal to:

where VOthe flow velocity at the entrance to the bell (m/s);

FO- the cross-sectional area of the inlet bell (m2);

F - area of the current cross-section of the bell (m2).

The relation (1) is true only up to a critical velocity of flow. When exceeding the critical speed with the reduction of the area of the outlet socket of the relation (1) will not be maintained, the energy utilization factor of the current environment will be reduced, the system may experience cavitation. Therefore, the ratio of the areas of the input FOand the output Fνthe holes of the socket taken from the relation:

where Vgcritical flow rate, with further increase of which sharply increased loss of energy flow (for each type of environment is determined experimentally).

Typically, the flow velocity of the current environment at the entrance Vo into the socket varies within very wide limits. For example, the famous sharp fluctuations in wind speed, abruptly changing the speed of the rivers in the summer, spring, drought, rain, different speed marine and ocean waves, etc. If not to take into account the relation (2), up to a certain value of the velocity VOenergy losses in the cowl will be insignificant. But as soon as the value of VOwill be so, in which speed is of Otok output from the cowl V νapproaches the value of VOthe resistance of the funnel the flow of the current environment will increase dramatically, and the utilization of the energy of this flow will be reduced. To avoid this, it is necessary to exit from the cowl to use square holes, in which even when a sudden increase in the speed of flow VOthe flow velocity at the outlet would always be less than the critical velocity Vg. In this case, the energy loss of the flow will be minimal.

But this raises the threat of losing energy selected by bell, in the working bodies. For each pneumatic or hydraulic machines has its own optimum flow rate of the driving environment. As well as the flow velocity at the entrance to the funnel varies widely, widely, will fluctuate and the flow velocity at the exit of the funnel. Therefore, it will not coincide with the optimum for the given working body of the flow rate and the utilization rate of energy flow will be low. To prevent this current environment at the outlet of the funnel is divided into multiple threads. If the flow rate of the current environment at the entrance to the bell VOsmall, bell-assign one or two of flow, but with a speed close to the optimum for the work of the authority. If the velocity VOdramatically, the current environment n is the exit of the funnel is divided into a larger number of threads so that in order to apply to a greater number of working bodies with velocities close to the optimum. In that case, the energy utilization factor of the current environment will be the maximum.

Finally, it is known that the resistance of the walls of the funnel the flow of the current environment depends on the flow velocity and angle of attack. As with increasing flow rate and with increasing angle of attack resistance to movement of the flow increases. If the socket has a conical shape, the angle of attack over the whole cross section of the socket remains unchanged, and the flow velocity increases proportionally to the square of the diameter of the bell. Hence, closer to the exit of the conical socket of the flow resistance increases dramatically, resulting in energy utilization factor of the current environment is reduced.

If decreasing the diameter of the socket to reduce the angle of attack of the current environment, the resistance of the walls of the funnel flow will decrease, and consequently, improve the energy utilization factor of the current environment. To achieve this, the socket give a convex shape in the direction of the pass-through flow of the current environment. In this form of socket with increasing flow rate as it is moved along the socket at the same time decreases the angle of attack of the flow, which reduces the flow resistance and to increase the coefficient of COI is whether his energy.

Thus, the proposed method provides a solution to the problem of improving the efficiency of energy extraction current environment by giving the cowl of rational forms and sizes, and due to the rational use of selected energy.

The present invention is industrially applicable, because its implementation does not require the use of special technologies, in addition to those used in mechanical engineering in the manufacture of such products.

Technical Ekonomicheskaya the effectiveness of the proposed method is as follows.

1. Increasing the energy efficiency of the current environment.

2. Is the possibility of using low-speed streams environment.

3. Allows a relatively simple control parameters of the flow at the exit of the funnel.

The method of energy extraction in the current environment, which consists in the fact that in the current environment, immerse the funnel, and to divert the current environment, passing through the funnel, to the working body, such as the turbine, characterized in that the socket give a convex shape in the direction of the pass-through flow of the current environment, the ratio of the areas of the inlet and outlet holes of the socket perform a large ratio of the velocity of flow at the inlet and boundary flow velocity, when the future is the increase which the dynamic pressure is reduced, and after passing the socket depending on the energy of the current thread it is distributed between several working bodies.



 

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