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.
Measured parameters: normal load pressure at the point of application of force F on the surface of the gear, measured on the scale of the dynamometer, speed gear (crank shaft).
Calculated parameters: power, generated by setting the WHD-2, the efficiency of the installation of WHD-2 interaction with its work items with a stream of air depending on the number of work items.
Tests were performed at three flow rate:
- 13.5 m / s at a distance of 1.75 m from the fan, the power of the wind flow acting on the first working element of the installation of WHD-2, was equal to 248 Tues;
- 5.35 m / s at a distance of 5.5 m from the fan, the power of the wind flow acting on the first working element of the installation of WHD-2, was equal to 29.1 Tues;
- 4.5 m / s at a distance of 8.0 m from the fan, the power of the wind flow acting on the first working elements of the unit WHD-2, was equal to 15.9 Tues;
The number of work items under study: 8, 4, 2, 1.
Plots of the maximum power generated by the installation of WHD-2 in the interaction of oscillating working elements of the air flow generated by the fan, depending on the flow rate and quantity of work items that are shown in Fig. 21.
Phase angle between the axes of cranks in a row on all of the following graphs is:
- Between 1 and 2 work items - 300 degrees;
- Between 2 and 3 work items - 300 degrees;
- Between 3 and 4 work items - 300 degrees;
- Between 4 and 1 work items - 180 degrees.
Phase angle between the axes of cranks in adjacent rows in all of the following charts is 180 degrees.
A feature of these tests is that the air flow rate at which the measurement of power, is conditional, since it characterizes the rate of flow of air exposure on the first working element, while the rate of flow effects on the second and subsequent work items are reduced in accordance with the schedule given in Fig. 18.
Power flow from the fan in these tests at the same order as the total value of mechanical damping, which is composed of friction in gears and gearing friction in the joints of gears. The maximum mechanical damping is setting the WHD-2 with eight work items and eight-toothed gears, and the minimum mechanical damping is setting the WHD-2 with one working member and two toothed gears. The installation of WHD-2 with a working element has a high speed rotation of the gear pinions, while developing an air speed 13.5 m / s capacity greater than the installation of WHD-2 with four or eight work items. However, when air flow rate equal to 5.5 m / s, power setting WHD-2 with eight work items is higher than the capacity of the plant WHD-2 with two and four work items.
Apparently, with the number of work items the most important factor is the choice of phase angle between adjacent elements of the workers, is largely influenced by both the total value of UAI, and the total value of aerodynamic damping.
Due to the large scatter of the kinetic energy of air flow produced by fan with distance from the discharge pipe fan investigate the effect of increasing the power taken from the set with the number of work items, interacting with the air flow was not possible.
Schedule change in the efficiency of the installation of WHD-2 depending on the number of work items at a flow rate of air from the fan, equal to 5.5 m / s, shown in Fig. 22.
Despite the significant irregularity of the air flow affecting the work items under consideration at this chart just seen a significant influence of the mechanical and aerodynamic damping, depending on the number of work items that interact with the air stream.
Schedule of changes in the intensity of rotation of pinion shaft of the generator set WHD-2 with a single work item, depending on power output during the interaction with the air flow produced by a fan at an air speed 5.5 m / s, shown in Fig. 23 ("Flutter" single element oscillating in the air stream).
The number of gears in mesh - 2.
Diameter gear - 300 mm.
The maximum efficiency - 9.35%.
From the graph that the maximum power in the interaction with the flow of air from the fan unit WHD-2 with a working element generates at 60 rev / min rotation of the shaft of the generator.
In addition, this chart is a clear demonstration of the possibility of obtaining the flutter of a single element in the air stream.