Distribution chamber

FIELD: machine building.

SUBSTANCE: distribution chamber is confined from outside by housing and bottom (3) to connected two lateral feed channels (1) and central discharge channel (7) via clearances between bottom (3) and end parts of end parts of inner walls (2). Housing is composed of two outer walls (5) and bottom (3). Set of plates (6) making working fluid channels (4) is arranged in cross-section of central discharge channel (7), parallel with inner walls (2) with clearance there between. Lateral discharge channels (1) are separated from central discharge channel (7) by inner walls (2) directed along outer walls (5). Outer and inner walls (5, 2), bottom (3) and set of plates (6) are composed by vertical flat plates. Porosity factor of said set 6 corresponds to 0.3-0.8. Cited are relationships for distribution chamber allowing for chamber height, chamber inlet and outlet heights, half width of housing and that of central part of central discharge channel (7), half width of outer and inner parts of central discharge channel (7).

EFFECT: enhanced performances.

1 dwg

 

The invention relates to fluid mechanics and can be used in distributing manifold systems devices.

Known distribution chamber, comprising a housing, inside which a gap is established shell, a cylindrical annular insert, the upper end of which is adjacent to the bottom end of the shell, and the bottom end is installed with a clearance relative to the plate, coaxial side standpipe and the Central discharge channel provided between a pressure chamber, the displacer, is made in the form of a cylinder with cover, upper part of which is displayed in the annular cavity insert, installed with a clearance with respect thereto and located below the upper part of the annular insert [RF Patent for the invention №2025799 "Nuclear reactor"; priority from 02.10.1990; registered 30.12.1994].

A disadvantage of the known device is that it does not provides the possibility for a given profile of the flow velocity at the exit from the distribution chamber through the proper ratio of its size.

The closest to the technical nature of the claimed device is distributing chamber, bounded on the outside by the housing and bottom and connecting the two side of the inlet channel and the Central discharge channel through the gaps between the bottom and end parts inside nih walls. The casing is formed by two outer walls and bottom. In the cross section of the Central discharge channel parallel to the inner walls with a gap relative to each other is installed plates with channels for the passage of the working environment. Side of the inlet channels is separated from the Central outlet channel inner walls oriented along the exterior walls, and exterior and interior walls, the bottom and plates made in the form of upright flat plates [Fomichev MS Experimental hydrodynamics of NPU. M.: Energoatomizdat, 1989. Str-141].

A disadvantage of the known device is that the design flow part allows you to change in a relatively narrow range of velocity profile (flow rate) of the working medium at the outlet of the system of plates due to the fact that the flow of working medium in the gap between the plate and the plate in the direction from the peripheral parts to the center with the distribution of fluid flow through the channels of the system of plates.

The objective of the invention is to avoid this drawback, namely the extension of the range of variation of the velocity profile (flow rate) of the working medium at the outlet from the distribution chamber by means of the ratio of its size.

To eliminate this drawback in the distribution chamber bounded on the outside by the housing and the bottom and connecting the two side of the inlet channel and the Central discharge channel through the gaps between the bottom and end parts of the inner walls, in which case formed by two outer walls and a bottom in the cross section of the Central discharge channel parallel to the inner walls with a gap in relation to each other with the plates forming channels for the passage of the working environment, the side of the inlet channels is separated from the Central outlet channel inner walls oriented along the exterior walls, and exterior and interior walls, the bottom and plates made in the form of upright flat plates features:

is the coefficient of porosity system plates to provide in the range from 0.3 to 0.8;

- ratio distribution chambers to perform in accordance with the terms and conditions, taking into account the relationship, first, the height of the distribution chamber and the height of the entrance; secondly, the height of the entrance of the distribution chamber, the half-width of the hull and the half width of the outer part of the Central outlet channel; third, the height of the entrance of the distribution chamber and the half width of the inner part of the Central outlet channel; fourth, the height of the distribution chamber, the height of the entrance, the half width of the outer and inner parts of the Central outlet channel; fifthly, the height of the distribution chamber, the height of the entrance and the half width of the outer part of the Central outlet channel;

- dimensions ol the exact part of the distribution chambers to associate with its hydrodynamic characteristics ratio, taking into account the average speed of the working environment in the channel system of the plates and in the system of plates in General, the height of the distribution chamber, the height of the entrance, the width of the outer part of the Central outlet channel, the number of channels in the system of plates, the width of the channel plates, the current width of the system wafer and the width of the perforated part of the system of plates.

A top view of one of the variants of the distribution chamber is represented on the figure, where the following notation: 1 - side inlet channel; 2 - inner wall; 3 - bottom; 4 - channel system plates; 5 - the outer wall; 6 - system of plates; 7 - Central discharge channel.

Distribution Luggage is limited to the outside of the casing and the bottom 3 and connects the two side of the inlet channel 1 and the Central discharge channel 7 through the gaps between the bottom 3 and the end parts of the inner walls 2.

The casing is formed by two outer walls 5 and bottom 3.

In the cross section of the Central discharge channel 7 in parallel to the inner wall 2 with a gap relative to each other is installed plates 6 forming channels 4 for the passage of the working environment.

Side inlet channels 1 are separated from the Central outlet channel 7 of the inner walls 2, which are oriented along the outer walls 5.

Exterior 5 and the interior is s 2 wall, plate 3 and plate 6 made in the form of upright flat plates.

The coefficient of porosity system plate 6 is in a range from 0.3 to 0.8.

The ratio of the size distribution chambers correspond to the conditions:

H-h0,(1)

0h4(l4-l3),(2)

0,6h-l20,(3)

l2-0,21H-0,22h-0,14l30,(4)

H-0,29 h-0,18l30,(5)

where H is the height of the distribution chamber, m; h - the height of the entrance of the distribution chamber, m; l4- half-shell, m; l3the width of the outer part of the Central outlet channel 7, m; l2the width of the inner part of the Central outlet channel 7, m

The dimensions of the flow part of the distribution chamber is chosen taking into account the hydrodynamic characteristics of its flow part using the following relationship:

u-u(2,1-0,63L)[(4,8-2,8L)(ll1-1)3]-1=0,(6)

where u is the average velocity of the working medium in the channel system of the plates 6, m/is; u- the average speed of the working environment in the system of the plates 6 in General,L=(0,21H+0,22h+0,14l3)(2n0l0)-1- the relative width of the jet of fluid into the meeting place with a system of plates 6; H - the height of the distribution chamber, m; h - the height of the entrance of the distribution chamber, m; l3the width of the outer part of the Central outlet channel 7, m; n0- the number of channels in the system plates 6, m; l0- the width of the channel system of the plates 6, m; l - the current width of the system of plates 6, m; l1the width of the perforated part of the system of plates 6, m

Used in expressions (1÷6) denote structural elements of the distribution chamber is represented on the figure.

Ratios for the determination of hydrodynamic non-uniformity at the output of the axisymmetric distribution chambers are designed with consideration of the law of conservation of mass in the assumption of constant thermophysical properties of the working cf the water and the jet nature of its course.

At the conclusion of the calculated ratios adopted the following assumptions.

Moving along the bottom 3 flat stranded jet after turning in the center of the distribution chamber is converted to round the flooded stream.

When moving flat half-jets along the bottom 3 after site stabilization, flat half of the jet along the body and a flat submerged jet in the main volume of the distribution chamber is to increase the area of their cross section, accompanied by a decrease in the speed of the working environment in it.

Angle unilateral extension flooded and flooded streams is 12°.

When injected jet system plates 6 one part of the flow enters the channel 4 system plates 6 located at the meeting point of the jet, the other spreads along the system of plates 6 with the change in the flow rate along the path.

Equation (2) corresponds to the relationship of the width of the side of the inlet channel 1 and the height of the entrance of the distribution chamber, the relation (3) is the condition for the reverse rotation of the jet of fluid into the distribution chamber, the relation (4) is the condition of contact of the inner side surface of the flat submerged jet system plates 6, and the relation (5) is the condition for transforming the flat half of the jets in the flat flooded stream in the bulk of raspredelitelnoi camera as a result of rotation of the stream.

During the working environment in the flowing part of the distribution chamber is as follows.

The work environment through two side of the inlet channel 1 grosseserrata in the gaps between the bottom and end parts of the inner walls 2, go into the distribution chamber, the change in her direction, moving toward each other along the bottom 3 in the form of a flat half-jets that are the result of a merger with each other and rotation in the Central part of the bottom 3 is converted into a flat flooded stream. The specified stream enters the system plates 6. One part is included in the channel 4 system plates 6 in it and the other two parts move along a system of plates 6 with the distribution of flow along its peripheral channels 4. Channel 4 system plates 6 working environment comes in the Central discharge channel 7.

A specific example of the distribution chamber

Distributing chamber has the following ratio: (H-h)/l2=0,28; H/(l4-l3)=1; H/(l4-l3)=0,5; (l3-l2)/l2=0,44. The coefficient of porosity system plates (6) (ε) is equal to the value of 0.52. The Reynolds number Re in the side of the inlet channel 1 is 0,83·104. In the system of plates 6 is equipped with 14 plates and 15 channels 4. The working medium is water.

The result of the comparison of the results of calculation according to equation(6) with the experimental data, received for distribution chambers that meet the conditions (1)÷(5), it was found that the difference in relative velocitiesu/unot exceed ±15%.

The technical result consists in expanding the functionality of the device during the formation of hydrodynamic non-uniformity at the exit from the distribution chamber.

Distributing chamber, bounded on the outside by the housing and bottom and connecting the two side of the inlet channel and the Central discharge channel through the gaps between the bottom and end parts of the inner walls, and a housing formed by two outer walls, in the cross section of the Central discharge channel parallel to the inner walls with a gap in relation to each other with the plates forming channels for the passage of the working environment, the side of the inlet channels is separated from the Central outlet channel inner walls oriented along the exterior walls, and exterior and interior walls, the bottom and plates made in the form of upright flat plates, characterized in that when the porosity coefficient system of plates corresponding to the range from 0.3 to 0.8, and the ratio of the size distribution of the camera thus ejstvujuschij conditions:
H-h0,(1)
0h4(l4-l3),(2)
0,6h-l20,(3)
l2-0,21H-0,22h-0,14l30,(4)
H-0,29h-0,18l30,(5)
where
H - the height of the distribution chamber, m,
h - the height of the entrance of the distribution chamber, m;
l4- half-shell, m;
l3the width of the outer part of the Central outlet channel, m;
l2the width of the inner part of the Central outlet channel, m,
the dimensions of the flow part of the distribution chamber associated with its hydrodynamic characteristics in the following ratio:
u-u(2,1-0,63L)[(4,8-2,8L)(ll1-1)3]-1=0,(6)
where
u is the average velocity of the working medium in the channel system of the plate, m/s;
u- the average speed of the working environment in the system of plates in General, m/s;
L=(0,21H+0,22h+0,14 l3)(2n0l0)-1- the relative width of the jet of fluid into the meeting place with a system of plates;
H - the height of the distribution chamber, m,
h - the height of the entrance of the distribution chamber, m;
l3the width of the outer part of the Central outlet channel, m;
n0- the number of channels in the system plates, m;
l0- the width of the channel plates, m;
l - the current width of the system of plates, m;
l1the width of the perforated part of the system of plates, m



 

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