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22.10.2012 20:43:55
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7.4. Experimental laboratory wind-hydro-device WHD-1.

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Experimental laboratory wind-hydro-device WHD-1 was constructed on the basis of materials submitted to the papers [19-21] and was a platform made in the form of rectangular plates, which may be set from 1 to 8 modules with the test work items.

Platform size: 180 mm x 320 mm

Modules of 8 units were placed along the length of the platform by a scheme analogous to the scheme shown in Fig. 4. The length of the crank Lcr = 22 mm. and the amplitude of the reciprocating movement of the working elements of the "A".

A = 2 * Lcr = 44 mm.                                                                                                            (7)

Work items are in the form of plates of rectangular shape with the following parameters:

- Width                  b = 64 mm.

- The height         h = 172 mm.

- The plate thickness    t = 1,0 mm.

The material elements of work - duralumin D16T marks.

The area of the working element                  Swe = b * h = 0,29 sq.m.                           (8)

Work items are arranged in two rows, four working elements in each row.

Phase angle between adjacent working elements in each row is 90 degrees.

Phase angle between adjacent rows was equal to 180 degrees.

The location of the modules according to the schemes shown in Figures 4 and 5, the scheme of interaction with the air flow is shown in Fig. 6. On the lateral surface of the work items for the entire length of front and rear edges of the silk threads glued red visualization of air flow behavior when interacting with work items. In the working chamber aerodynamic stand ADS-2 was removed from one side wall, and in its place established the platform laboratory wind-hydro-device WHD-1 together with the modules work items inside the working chamber. The transmission gear 6 and crank shaft ends were outside.

Arrangement of working elements of laboratory study of wind-hydro-device WHD-1 in the chamber aerodynamic stand ADS-2 is shown in Fig. 9.

When interacting with a stream of air 1 in the chamber 2 working three elements begin to move, transferring the energy of motion through the connecting rods and cranks (in Fig. 9 not shown) on the shaft 4 mounted on the platform 5. On the outer side of the platform 5 at the four shafts mounted pinion gearing 6.

With this arrangement, the work items were inside the working chamber and the transmission gear - from outside the working chamber, which made it possible to easily change the phase angle between adjacent elements of the workers or to establish a DC generator for removing electrical power from the shaft of the crank of any module (Fig. 1 and 2.) The plane of the cantilever set the work item was located perpendicular to the axis of the rod with the ability to change the angle of the axis of the rod. In all experiments, the angle between the axis of the rod and the plane of the work item was 90 degrees (Fig. 2).

At the initial interaction of the working element having the opportunity to make reciprocating and rotational movement of the air flow unsteady aerodynamic forces and moments (UAI) is zero. Due to the interaction of a work item with the flow of air it begins to move along the path laid down in the construction of the device, breaking the force of the mechanical damping (friction at the nodes of the connection gears and pinion gearing) and the aerodynamic damping, and making thus reciprocating and rotational movement as a condition of UAI. Unsteady aerodynamic forces and moments (UAI) occur, and increases from zero to its maximum value due to the kinetic energy of the flow and intensity of the interaction of a work item with the flow. The mechanical energy of rotational and reciprocating movements of a work item in the experimental laboratory setup WHD-1 through support mechanisms is converted into mechanical energy of the crank shaft. Further transformation of the energy of the crank shaft into electrical energy by a generator mounted on the shaft crank is not difficult. The only condition for obtaining useful work in the proposed scheme is that the initial rotation of the crank shaft (or shaft of the generator) must be unloaded. Once the UAI reached its maximum value, and the crank shaft - maximum speed, or you can load on the generator and get useful work by converting kinetic energy into electrical energy flow. Power of the air flow in the working part of the aerodynamic stand was determined by the formula:

Nn =, W                                                                                                                    (9)

where q = 1.2 kg / m - density of air;

           S - cross-sectional area of the working chamber aerodynamic stand ADS-2, where the measured flow rate of air, sq.;

          S = a * b, meters sq,                                                                                                 (10)

where a = 0.18 m - the length of the cross section of the working chamber;

           b = 0.15 m - width section of the working chamber;

           V - velocity of air flow, m / sec.

Efficiency laboratory setup WHD-1

                    Kp =                                                                                              (11)

where Np - power generated by the plant, W;

           Nn - power of the air flow, W.

In the process of conducting experiments on the aerodynamic stand ADS-2, related to the definition of interaction study of work items, performing as part of an array of reciprocating and rotational oscillations, with the air flow, air flow rate is varied at the inlet into the working chamber and the amount of study work items.

Measured parameters: the static pressure drop across the height of the working chamber, the current and voltage taken from the generator shaft.

Calculated parameters: air speed, the power of the wind flow, the electric energy generated by a DC generator, the efficiency laboratory unit WHD-1 interaction with its work items with the air flow.

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