CN113882954A

CN113882954A - Low flow resistance diverging device

Info

Publication number: CN113882954A
Application number: CN202111093013.4A
Authority: CN
Inventors: 何学刚; 张志刚; 杜鹏程; 马同玲
Original assignee: Beijing Power Machinery Institute
Current assignee: Beijing Power Machinery Institute
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2022-01-04

Abstract

The invention discloses a low flow resistance flow dividing device, and belongs to the technical field of engines. The device comprises a flow divider main body, a flow dividing pipe, a flow rectifying pore plate and an air inlet pipeline; the shunt main body is of a circular ring-shaped closed shell structure, the rectifying pore plate is positioned in the shunt main body, the plane of the rectifying pore plate is parallel to the end face of the shunt main body, and the rectifying pore plate divides a cavity in the shunt main body into two independent circular ring-shaped cavities; the air inlet pipeline is connected with the diverter main body in a tangential direction and is communicated with one circular cavity, and the diverter is connected with the end face of the diverter main body and is communicated with the other circular cavity; and the rectifying hole plates are uniformly provided with rectifying holes. The invention can evenly divide one path of fluid into a plurality of paths of fluid, and reduces the flow resistance loss so as to meet the working requirement of the engine.

Description

Low flow resistance diverging device

Technical Field

The invention belongs to the technical field of engines, and particularly relates to a low flow resistance flow dividing device.

Background

The engine is constrained by working conditions, schemes or component characteristics in the working process, and a large amount of fluid diversion measures are required to meet the designed parameter index requirements. A flow divider is a device having a plurality of branch outlets, which can divide the fluid (liquid or gas) in the main pipeline into a plurality of branch outlet pipelines.

The structure of a conventional fluid diversion device is shown in fig. 1, and the diversion device is composed of a main pipeline and a branch pipeline. But the flow resistance loss of the scheme is large; and as the on-way pressure of the main pipeline is reduced, the inlet pressure of the tail end branch is obviously lower than that of the main stream, so that the branch is unevenly distributed.

In a precooling combined engine adopting a light spiral heat exchanger, a light high-efficiency precooler is a core component. In order to reduce the flow resistance loss, the precooler generally adopts a multi-module design (generally more than 10-30), that is, the number of inlet interfaces of the precooler is as high as 10-30. The compressor is generally an outlet, so that the outlet of the compressor is not matched with the inlet interface of the precooler, and the problems of uneven flow distribution, uneven inlet pressure, overlarge flow resistance loss and the like exist.

Disclosure of Invention

In view of this, the invention provides a low flow resistance flow dividing device, which can divide one path of fluid into multiple paths of fluid uniformly, and has small flow resistance loss, so as to meet the working requirements of an engine.

A low flow resistance flow divider comprises a flow divider main body, a flow dividing pipe, a flow rectifying pore plate and an air inlet pipeline; the shunt main body is of a circular ring-shaped closed shell structure, the rectifying pore plate is positioned in the shunt main body, the plane of the rectifying pore plate is parallel to the end face of the shunt main body, and the rectifying pore plate divides a cavity in the shunt main body into two independent circular ring-shaped cavities; the air inlet pipeline is connected with the diverter main body in a tangential mode and communicated with one circular ring-shaped cavity, and the diverter is connected with the end face of the diverter main body and communicated with the other circular ring-shaped cavity.

Furthermore, the shunt main body consists of a front shell and a rear shell, the front shell and the rear shell are completely identical in structure, and a closed circular cavity with a rectangular longitudinal section is formed after the front shell and the rear shell are buckled with each other.

Further, the shunt tubes are uniformly distributed on the end face of the shunt body along the circumferential direction of the shunt body.

Furthermore, the profile of the rectifying hole on the rectifying hole plate is a straight-through hole profile or a pneumatic hole profile.

Further, the hole flow area of the rectifying holes on the rectifying hole plate accounts for 50% of the annular area; the rectifying holes are arranged on the surface of the rectifying hole plate in a staggered manner in a concentric circle mode.

Has the advantages that:

1. the main body of the flow divider is of a circular structure, and the air inlet pipeline injects airflow along the tangential direction of the circular structure, so that rotational flow air inlet is formed in the main body of the flow divider, the flow resistance of the flow divider is reduced, and the loss coefficient of the flow resistance is less than 0.5%.

2. The invention adopts the rectifying pore plate to separate the interior of the main body of the flow divider, and the rectifying pores on the rectifying pore plate rectify the incoming flow, thereby improving the flow rate of the branch and the uniformity of the flow field, and the flow unevenness is less than 0.1%.

3. The rectifying pore plate is simultaneously connected with the front shell and the rear shell of the shunt main body, so that the structural strength and the bearing capacity of the shunt main body are enhanced, and the shunt main body can work under a high-pressure environment.

Drawings

FIG. 1 is a schematic diagram of a shunt device in the prior art;

FIG. 2 is a schematic view of the overall structure of the low flow resistance flow divider of the present invention;

FIG. 3 is a half-sectional view of the low flow resistance flow splitting device of the present invention;

FIG. 4 is a plan view of a rectification orifice plate;

FIG. 5 is a schematic view of a profile of a flow orifice;

fig. 6 is a graph of the current sharing result of the current sharing device of the present invention.

Wherein, 1-shunt tube, 2-back shell, 3-front shell, 4-air inlet pipeline, 5-rectification pore plate, 6-straight through pore profile, 7-pneumatic pore profile.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

As shown in fig. 2 and 3, the invention provides a low flow resistance flow divider device, which comprises a flow divider body, a flow dividing pipe 1, a flow rectifying orifice plate 5 and an air inlet pipeline 4.

Wherein, the shunt main part comprises back casing 2 and procapsid 3, forms ring shape closed housing structure after back casing 2 and procapsid 3 dock, and the casing is inside to be the annular cavity of rectangle for the cross-section.

The rectifying pore plate 5 is welded in the shunt main body, the plane of the rectifying pore plate 5 is parallel to the end face of the shunt main body, and the rectifying pore plate 5 divides the cavity in the shunt main body into two independent circular cavities; the air inlet pipeline 4 is communicated with one circular ring-shaped cavity after being connected with the front shell 3 of the splitter main body in a tangential direction, the plurality of splitting pipes 1 are connected to the end face of the rear shell 2 of the splitter main body and communicated with the other circular ring-shaped cavity, and the splitting pipes are uniformly distributed on the end face of the splitter main body along the circumferential direction.

As shown in fig. 4, the rectifying holes are arranged in a staggered manner on the surface of the rectifying orifice plate in a concentric circle manner, and the hole flow area of the rectifying holes on the rectifying orifice plate accounts for 50% of the annular area; the above characteristics enable incoming flow to obtain a more uniform rectification effect.

As shown in fig. 5, the profile of the rectifying hole on the rectifying orifice plate 5 is a straight-through hole profile or an aerodynamic hole profile. When a straight-through hole type surface is adopted, the inner diameter d is 8 mm; when the pneumatic hole type surface is adopted, the aperture D of the inlet and the outlet is 12mm, and the inner diameter D of the throat is 8 mm.

The working principle is as follows: the inlet airflow firstly enters the annular cavity corresponding to the front shell 3 through the inlet pipeline 4 in the tangential direction, the fluid enters the annular cavity corresponding to the rear shell 2 after being equalized by the rectifying pore plate 5 and finally flows out of the shunt pipe 1, so that the pressure of each branch pipeline is uniform, the equalized effect is shown in figure 6, and the flow rate fluctuates up and down in 0.125 horizontal line from the flow rate statistics of each flow channel, the amplitude value does not exceed 0.05, which indicates that the device has good equalized flow effect.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low flow resistance flow dividing device is characterized by comprising a flow divider main body, flow dividing pipes, a flow rectifying pore plate and an air inlet pipeline; the shunt main body is of a circular ring-shaped closed shell structure, the rectifying pore plate is positioned in the shunt main body, the plane of the rectifying pore plate is parallel to the end face of the shunt main body, and the rectifying pore plate divides a cavity in the shunt main body into two independent circular ring-shaped cavities; the air inlet pipeline is connected with the diverter main body in a tangential mode and communicated with one circular ring-shaped cavity, and the diverter is connected with the end face of the diverter main body and communicated with the other circular ring-shaped cavity.

2. The low flow resistance flow diverter device of claim 1 wherein the diverter body is comprised of a front housing and a rear housing, the front and rear housings being identical in construction and being snapped together to form a closed circular cavity having a rectangular longitudinal cross-section.

3. The low flow resistance flow diverter device of claim 2 wherein said diverter tubes are evenly distributed on said end surface of said diverter body in the circumferential direction thereof.

4. The low flow resistance flow diverter device according to claim 3 wherein the profile of the flow straightening holes in the flow straightening hole plate is a straight hole profile or an aerodynamic hole profile.

5. The low flow resistance flow divider device of claim 4 wherein the orifice flow area of the flow straightening orifices in the flow straightening orifice plate comprises 50% of the annular area; the rectifying holes are arranged on the surface of the rectifying hole plate in a staggered manner in a concentric circle mode.