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9.3. Study of scattering (change) the kinetic energy of the air flow created by a fan.

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As a source of air flow was used axial fan air with the following parameters:
motor power Ne = 1.5 kW;
number of revolutions n = 1420 rev / min;
the size of the working section of the cochlea at the output - 220 * 220 square mm.

Power of the air flow generated by the fan is determined by the formula (9):
N  flux = , W

where q = 1.2 kg / m - density of air;
S - the area in which the measured flow rate of air created by a fan, sq.m. and defined by the formula (10):

S = a * b, sq.m.

In determining the capacity of the air flow at the outlet of the fan

a = b = 0.22 m - the size of the output section snail fan.

In determining the capacity of the air flow created by a fan at a distance «L» of the fan, the parameter "a" characterizes the amplitude of the reciprocating movement of work items to be determined in accordance with the formula (7);

a = A = 2 * Lcr = 2*185 = 370 mm,

where Lcr = 185 mm. - The length of the crank during the aerodynamic testing
The "a" characterizes the height of the work item
b = h = 710 mm. - Height of the work item

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 work items

Sc = 2 * A * h                                                                                                                      (12)

where A - amplitude of the reciprocating movement of the working element;
h - height of the work item.
Sc = 0.525 sq.m.
V - velocity of air flow, m / sec.

Power flow of air at the outlet of the fan.
Nf = 952 W,
where V = 32 m / s - air flow rate, measured by electron anemometer SMART SENSOR model AR816 (China) directly at the output of the snail fan (V = 31-33 m / s, taken about V = 32 m / s) .

Efficiency pilot plant with WHD-2 was determined in accordance with the formula (11)

Ke =

where Np - power generated by the plant, W;
Nn - power of the air flow, W.

The results of investigations of changes in the kinetic energy of the air flow generated by the fan at different distances from the outlet fan (1.75 m, 5.35 m, 8 m) the free movement of the flow shown in Fig. 18.

Power flow of air, measured at the axis of the fan, and, consequently, the kinetic energy of the air flow generated by the fan, significantly decreases with increasing distance from the discharge pipe fan. Non-uniform air flow. In this case, we can only speak in qualitative tests in order to obtain confirmation of the hypothesis about the possibility of using UAI arising from the interaction of oscillating working elements of any fluid flow.

 

 

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