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22.10.2012 20:43:55
23.08.2011
03.11.2009
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7.5. Investigation of the interaction of work items of the laboratory setup with a stream of air, obtained by aerodynamic stand.

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The methodology of the tests was developed based on the material presented in [19, 22-25].

Measurements of dynamic pressure sensors were five static pressure, with one sensor placed at a distance of 23 mm. from the entrance into the working chamber, three - length of the working chamber at a distance from the start of the working chamber of 50 mm. 200 mm. and 315 mm., and one - at a distance of 26 mm. from the end of the working chamber during the flow. Work items are arranged along the length of the working chamber at a distance of 57.5 mm., 127.5 mm., 197.5 mm. and 267.5 mm. from the entrance of air into the working chamber of the wind tunnel.

In Fig. 10 shows the graphical dependence of the velocity distribution of air flow in the test section wind tunnel on the number of employees working elements along the length of the installation (without removing the useful work).
The rate of free flow of air entering the working chamber is constant and equal to 62 m / sec.
The studies were conducted with two, four, six and eight working elements.
The same rate of air flow persisted in filling the working chamber researched work items.
Work items are driven by air flow without removing the good work.

Designations:
L0 - the length of the working chamber aerodynamic stand;
L1 - the location of work items on the length of the working chamber;
57.5, 127.5, 197.5, 267.5 - the distance from the working chamber planes reciprocating movements of the axes of rotation of the second series of work items that are located on the platform installation WHD-1;
№ 1 - № 5 - the location of static pressure sensors along the length of the working chamber;
n - number of work items;
V, m / c - velocity of air flow;
L, m - the distance from the working chamber.
The arrow shows the direction of airflow W.

 The graph shows almost the same flow rate at the inlet into the working chamber, the equality of the flow velocity at the free (unperturbed) flow from the first work item and a further increase in air flow rate along the test section depending on the number of work items.

In Fig. 11 shows graphs of the air flow rate along the length of the working chamber, depending on the initial velocity of the free flow of partial renting of facilities.
The device operates in generator mode, output power in all the experiments the same and equal to 12 watts.
The number of work items is constant and equals 8.

The studies were conducted at four speeds of the free (unperturbed) flow of air (working chamber is filled researched work items): 17.8 m / sec., 38.1 m / sec., 48,7 m / s and 58.7 m / with . The same rate of air flow persisted in filling the working chamber of the studied elements working at partial capacity renting.
Work items are driven by air flow.

In all graphs is clearly seen initial decline rate of air flow on the (17 - 25)%, the alignment of the air flow rate after the first work item at a speed of air flow and a subsequent increase in air velocity at the (27 - 40)% compared with that of the free air flow in the working chamber is not filled with work items under investigation.

Plots of output power and effective efficiency of the flow velocity of air «V» and the number of work items under study «n» is shown in Fig. 12 and 13, respectively.

With increasing speed, air flow and quantity of work items under study observed a proportional increase in output power and efficiency of the installation.

Graphs of pressure and velocity of air flow in cases where the worker is subject to the usual screw under investigation unit, shown in Fig. 14 and 15, respectively.

In the graphs clearly visible differences in the pressure and air flow velocity head in conjunction with conventional screw and the investigational device, placed in the same working chamber of the wind tunnel. In the test device is practically no pressure peaks and velocity at the inlet of the device and the output of the proposed device recorded some increase in air flow rate. Furthermore, the absence of a pressure jump at the inlet air flow in the intended device and indicates the absence of overturning moment on the device itself. For the propeller wind turbine (Fig. 14) is the so-called "dead zone" at a distance (9-15) D (where D - diameter of the screw), which is the distance required to restore the power of the air flow, while in the test device (Fig. 15) the "dead" zones are absent.

Behavior in the slipstream of silk, placed in a working chamber filled with work items WHD-1, indicating a laminar flow of air flow over the entire length of the working chamber.  In the case of turbulence in front of the working chamber WHD-1 laminirization flow occurs immediately after the first work item. In addition, the silk thread attached to the probe, is used as a needle, which was introduced into the process chamber along the entire length of the working chamber in the different sections.

 

 

 

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