SU1018692A2 - Air cleaning apparatus - Google Patents

Abstract

AIR CLEANING DEVICE, according to author. St., l 2535, about t.-g li c a k) n it with the fact that, with the purpose of turning | | degree of air purification without increasing hydraulic losses f, oio C1 +: abzheno flat partitions made with tsaicin

Description

The invention relates to air cleaning devices designed to take air from the atmosphere while at the same time cleaning it from sand, dust, other foreign matter and containing clean air to a helicopter’s gas turbine engine, whose input devices are located below the plane of rotation screw .. On the main bus. St. N is known for an air-cleaning device containing the first cleaning stage, made in the form of a curved channel formed by the outer and inner curved walls of the kaya, the subsequent stage is cleaned. ki made in the form of inertial separators, a channel for the removal of clean air and a channel for removing the dust concentrate. In this device, the inertial separators are made as elements with curved walls with bypass 4 channels between them, placed at the exit of the curvilinear channel step and form with the outer curved stitch of the first step of the channel for removal of dust concentrate, and with the inside - channel for clean air, the area of the inlet section of the channel of dust concentrate is not less than 0.15 t the area of the curved first section channel in the exit zone, and the minimum total area of the passageways (the bypass channels is not less than 0.75 from the area of the entrance section of the discharge diversion channel) Inertial separators form a narrowing channel of the concentrate: Thus, - that the minimum area of each subsequent channel is not more than the minimum. In order to prevent icing and the possibility of heating by the coolant, the inertial separators are made hollow til. The known device has permissible pressure losses due to hydraulic resistances, but an insufficient degree of air purification .... The purpose of the invention is to increase the degree of air purification without increasing hydraulic losses. The goal is achieved by the fact that the air cleaning device is equipped with flat partitions made with a thickness ( 0,0060, 009) R and with rounded output and input edges and installed in the horizontal, diametral plane of the curvilinear channel, the first stage, and the output edge n The partition is perpendicular to the central axis of the air-cleaning device at a distance (C, “9–0.1) 1) R from the exit of the curvilinear channel of the first stage to the entrance side, and the input edge is made in the form of an arc of a circle with a radius equal to (0, 35-0.37) R, directed by the convex part towards the entrance to the curvilinear channel of the first stage, with the center at the point located at a distance (1.08-1.1) R from the exit of the curvilinear channel of the first stage and from the central axis of the air cleaning unit devices at a distance of (1.48-1.50) R, where R is the internal The radius of the outlet channel for discharging air chistoJ-O. FIG. 1 shows the device, a top view of the section; in fig. 2 - one of the following cleaning steps; FIG. 3 is a graph showing the degree of cleaning () depending on the distance of the output edge from the exit of the curved channel of the first stage (2); in fig. 4 — graphs of the change in the degree of cleaning as a function of the radius of the entrance edge of the partition (g); Fig. 5 shows a graph of the degree of cleaning, depending on the distance from the center of the input circle, the edge from the exit of the curved channel of the first stage (z); in fig. 6 is a graph showing the degree of cleaning depending on the distance from the center of the input edge to the central axis of the air-cleaning device (}; figure 7 is the chart of change in hydraulic losses of the partition (Lr), depending on its thickness (C); FIG. partition (d), depending on its thickness s. The device contains the first cleaning stage 1, formed by the outer 2 and inner 3 curved walls, which form between them a curved channel with input 4 (section A-A and vyr (ode 5 (section B- B) angle of Gateway channel 8 is a value. In the horizontal diametral plane of the curved channel of the first stage, there are flat partitions 6 with a thickness of {0.006-9.009) R, where R is the inner radius of the outlet otrersti to drain clean to the spirit, with rounded output 7 and entrance edges 8. can be made hollow with the purpose of heating with a coolant at low temperatures: the output 7 of the partition 6 is perpendicular to the central axis of the device and removed from the output of the 5. curvilinear, first stage channel at (0.490, 51) R in st to the entrance crown. Entrance edge 8 is an arc ok (euzhnosty radius (0.35-0.37 directed by the convex side in st; the entrance to the curvilinear channel of the first stage, with the center a point remote from the output 5 of the curvilinear channel of the first stage on (1, 08-t, 1) R and from the central axis of the air-cleaning device by (1.8-1.5) and. These parameters were obtained in the simulation as an optimum), 1) So, according to FIG. 3, a decrease in the removal of the exit edge from the first curved first-stage channel less than 0.49 R does not increase the degree of cleaning, since all particles that were previously in the engine already collide with the partition, but lead to an increase in the weight of the structure and an increase in hydraulic losses from -aia friction. I 2) According to FIG. 4.size ra: dus input edges in & branu from the same considerations as in figure 3. 3) According to FIG. 5, the removal of the center of the circle of the input edge FROM the exit of the cryo-linear channel of the first stage is caused by obtaining the maximum possible cleaning distance. 4) According to FIG. 6, the removal of the center of the circle of the input edge from the center axis of the air-cleaning device is selected from the same considerations as in FIG. 3. 5). According to FIG. 7 and 8, the thickness of the partitions was chosen as the smallest condition for obtaining minimum hydraulic losses with allowance for 24 meters (with a margin of safety) in the design of the structure, in series with the first stage, i.e. after exit 6., four subsequent separation steps are installed. Stage g with bypass channels 9 - between them. Separating steps are formed by the elements of the dust collector 14 and the continuation of the outer curved wall 2. The elements are formed together with the continuation of the outer curved wall 2 of the narrower. Dust concentrate channel 15, and together with the continuation of the inner curvilinear wall 3 - expanding outlet channel 16 for oTf clean air water. Separation of outlet 5 rta channels 15 and 16 is carried out by the first element 10 in such a way that the entrance area to the dust concentrate channel is The value is not 0.15 of the total area of output 5. Elements 10-13 and dust collector 14 are installed at some distance from each other and form by-pass channels 9 between them which channel of dust concentrate 15 with output channel 1b. The shape of the elements U) -13 is such that the direction of the entrance to the bypass channels is with the direction riotOKa 15 in the dust concentrate channel angle / J "45 -90 ° and the direction of travel from the bypass channel coincides with the direction of flow in the output channel 16 channels on which occurs. rotation flow, have radii of curvature. Each bypass channel is approximately constant in its length of flow areas. Minimum (the slit of the bore section of each subsequent bypass channel is no more than the corresponding area of the previous bypass channel, and the minimum total area that is through the channel is approximately the area of the entrance to the channel of the concentrate. Each of the subsequent cleaning steps is an inertial separator ( Fig. 2) and includes the a-fi dust concentrate entry section (located in the dust concentrate channel 15). The separation portion is the angle of rotation of the flow in the selective section 45 - 90, area of purified air outlet В-с. (bypass channel al 9) and area of drainage of dust concentrate 2-7- (ajb is located in channel of dust concentrate 15), with 1 section of removal of dust concentrate from the previous stage simultaneously is a section of entry into the next | 1st stage. The area of removal of the dust concentrate from the last separator is adjacent to the dust-receiving slot 17 formed by the space between the dust collector k and the extension of the outer curvilinear wall 2. The device contains atm in the form of channel 18 and ezhektdra 19. The apparatus operates as follows. When the gas turbine engine of a helicopter is operating in conditions of high air dustiness, solid particles of dust and sand under the influence of the air flow and inertial forces enter the inlet C of the first cleaning stage 1. Part of the particles after collisions with partitions 6 and under the action of the air flow curvilinear wall 2. Then, together with a part of air (), the particles enter the channel 15 of the concentrate concentrate, and the main part of the air is 85%), being cleaned up from the discharge (dich particles, enters the output channel 9.2 channel 1b. Separation This is carried out at the leading edge of the glove element 10. Moving through the dust concentrate channel 15, the contaminated air enters the first separator from the number of subsequent purification steps, here the air flow is divided into two parts, one of which is in front of the bypass channel 9 turning the separation section through an angle of -90 °, whereby the contaminating particles are removed from the flow and the air enters the bypass 9 cleaned. The other part of the polluted air enters the next stage and so on. Finally, the dust concentrate enters the dust receptacle 17, from where it is diverted through channel 1B and ejected, overboard by ejector 19. Thus, the proposed air cleaning device due to the use of partitions 6 when ingested particles 1ZD180 microns has a degree with source 98.899, 3%, While, in known b, 5-69, the installed partitions 6 reflect these particles, directed them to the outer curvilinear wall 2, with subsequent ingress into the second cleaning stage.

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Claims (1)

AIR-CLEANING DEVICE by ed. St., No. 542535, on 4 and further, in order to increase the degree of air purification without increasing hydraulic losses, it is equipped with flat partitions made with a thickness of (0.006-0.009) R rounded output and input edges and installed in the horizontal, diametrical plane of the curved channel of the first stage, the output edge of the partition being perpendicular to the central axis of the air-cleaning device at distances (0.49-0.51) R from the output of the curved channel of the first stage in side of the entrance, and in one edge is made in the form of an arc of a circle with a radius equal to (0.35-0.37) R, directed by the convex part towards the entrance to the curved channel of the first stage, centered at a point located at a distance of (1.08-1.1) R from the output of the curvilinear channel of the first stage and from the central axis of the air-purifying device at a distance of (1.48-1.5) R, where R is the inside radius of the outlet. . A channel for clean air. 00 se <0