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10. Conversion of kinetic energy of air flow created by a fan into useful work.

Tests of interaction between work items with a pilot plant with a stream of air from the fan took place in August - September 2010.

The purpose of the tests:
1) checking of the installation of WHD-2 interaction with the air flow;
2) confirmation of the phenomena and laws, obtained by testing laboratory unit WHD-1 on the aerodynamic test bench;
3) checking the possibility of converting the kinetic energy of air flow into useful work in the natural air flow rate (5 - 12 m / s);
4) is it possible to obtain the flutter of a single work item, vibrating in the air stream;
5) study the effect of different profiles of oscillating working elements and its interaction with the flow of fluid in the value of UAI;
6) obtaining data for calculation, design and manufacture of generator to convert mechanical energy of rotation of the shaft a pilot plant with WHD-2 into electrical energy.

Working platform installation WHD-2 was set at a distance of 1.75 m, 5.35 m and 8 m from the fan in front of the outlet fan.
Work items undergo vibrational motion. There is a removal of useful work. The tests are performed during the motion of 8, 4, 2, and a working element, located in two rows.
Work items have been collected on the platform in accordance with the scheme shown in Fig. 6.

The length of the crank during the aerodynamic testing Lcr = 185 mm. and the amplitude of the reciprocating movement of the working elements of the "A" in accordance with the formula (7).
A = 2 *Lcr = 370mm.

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

- Width b = 410 mm.
- The height h = 710 mm. - during the aerodynamic testing;
- The thickness t = 2,0 mm.

Area of ​​work items during the aerodynamic testing in accordance with the formula (11)
Swi = 0.29 sq.m.

The area of ​​contact with the air flow (cross-sectional area that interacts with the air flow, defined by (limited) the reciprocating movement of the working elements perpendicular to the flow of Fig. 6) fluctuations in the work items in accordance with formula (12)

Sc = 0.525 sq.m.

Power flow of air created by a fan at a distance «L» the fan defined in paragraph 6.3, meaning that the calculated power is conditional, acting only on the first working element installation. The kinetic energy of the flow of air from the fan, acting on the second and subsequent work items that are reduced in accordance with the schedule shown in Fig. 18.
Work items undergo vibrational motion. There is a removal of useful work. The tests are performed during the motion of 8, 4, 2, and a working element, located in two rows.
The distance between the axes of the shafts of cranks in a row - 456 mm.
The distance between the axes of the shafts of cranks adjacent rows - 190 mm.
Phase angle between the axes of cranks on the same level ranged from 0 to 360 degrees.
Phase angle between the axes of cranks in adjacent rows changed from 0 to 360 degrees.

 

Measuring the power developed by the installation of WHD-2 was carried out on the shaft of a gear with the dynamometer. Dynamometer scheme is shown in Fig. 19.

 
 

Scheme for determining the coefficient of friction is shown in Fig. 20.
On the platform 1 of a pilot plant with WHD-2 shaft 2 is mounted rotatably and base 3 dynamometer. On the shaft 2 is located in gear 4, which rotates with the shaft (the direction of rotation indicated by arrow 5). The base 3 by means of ball bearings 6 are connected with a rack 7.

In the process of conducting experiments on a pilot industrial plant WHD-2 related to the definition of useful work as an effective power generated by the interaction of the studied 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 the working chamber, the number of workers studied elements the phase angle between adjacent working elements and the phase angle between adjacent rows of work items.

In order to increase efficiency WHD-2 installation when converting the kinetic energy of air flow into useful work during the transition of zero angle of attack, it was decided to optimize the profile of the lateral surface of the work item to make it convex.

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