RU2321779C1 - Swirler - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: swirler comprises housing whose inner side is provided with guiding grooves from the side of entrance of fluid. The flanges mounted at the ends of the swirler have guiding grooves made of tabs that embrace the periphery of the inner side of the housing. The number of grooves is determined from the equation proposed.

EFFECT: enhanced efficiency.

1 dwg

Description

The invention relates to energy, in particular to the field of production of thermal and electric energy in thermal and nuclear power plants, and can be used in pipelines with two-phase flows.

The prior art is known analogue - a device for influencing the fluid flow (patent application No. 1785115, published 05/10/96, IPC F15D 1/02), containing an axisymmetric channel for pumping the main fluid and a device for controlled hydrodynamic excitation of the fluid flow . The disadvantages of the analogue are: high hydraulic resistance of the device, contributing to the emergence and maintenance of vibrations in the pipeline, and the need for energy consumption for the supply of a disturbing jet.

The closest set of essential features is a swirler containing a cylindrical body, inside which involute grooves are made (utility model patent No. 41499, publ. 10/27/2004, IPC 7 F15D 1/04).

The disadvantages of the prototype are: vibration of the pipeline with a two-phase flow, the capture of a small amount of wall fluid for swirling, the relatively low effect of reducing the pressure gradient between the inner and outer radii of the fluid flow before entering the rotary section.

The problem solved by the invention is to reduce the vibration of the pipeline by increasing the efficiency of alignment of flow rates along the internal section by increasing the area of interaction with the moving two-phase flow and the volume of the swirling medium in the inner perimeter of the swirl.

This task is achieved due to the fact that, in contrast to the well-known swirler containing involute rectangular grooves, guide grooves in the form of petals are made on the inner wall of the proposed swirl from the inlet side of the fluid flow around the entire inner perimeter, and the number of grooves around the circumference of the cylindrical part of the swirl determined by the ratio D / 2, where D is the inner diameter of the main pipeline; the height of the guide groove of the petal h is 0.3 d, where d is the wall thickness of the main pipeline; the wall thickness of the swirl is d + 0.3d, and the length of the guide grooves in the swirl section is 10-15D, depending on the speed and mode of flow in the pipeline.

The length of the rectilinear zone of the swirl section with guide grooves is 10-15D, which is caused by the length of the stabilization section of the fluid flow at various flow conditions in the pipeline, characterized by flow characteristics (values of the Reynolds criterion).

The swirler performs the function of swirling the moving flow in order to maintain uniform pressure on the pipe walls in the turning section by equalizing the flow rates of the medium along the pipe cross section, as a result of which the pressure gradient decreases along the inner and outer radius of the wall inside the pipe in rotation and, as a result, the level decreases vibrations.

The invention is illustrated in the drawing, which shows a section of a swirler.

The swirler comprises a housing 1, at the ends of which flanges 2 are installed. On the inner wall of the housing 1 there are guide grooves 3. The swirler is attached with its flanges 2 to the pipeline. Guide grooves 3 are made in the wall of the straight section to the rotation of the pipe.

The swirler works as follows. When the fluid flow enters the swirl, the grooves 3, made in the form of petals along the inner surface of the housing 1, twist the fluid flow and evenly distribute it along the inner perimeter of the rotary section. The flow velocities of the medium along the pipe cross section when the flow enters the bend are constantly equalized and the pressure difference on the walls of the large and small internal turning radii tends to zero. Thus, the pressure on the outer wall of the rotary section decreases, the pressures on the outer and outer radii of the rotary section of the pipe are equalized, which eliminates the pressure gradient on the walls and reduces the vibration of the pipeline.

When implementing the invention, the following technical results were obtained: an increase in the area of interaction and the captured volume of the medium along the entire inner perimeter in front of the turning section, an increase in the effect of swirling the flow, and a decrease in vibration of the pipeline due to the absence of a pressure gradient on the walls of the pipeline; elimination of contamination of the guide grooves with deposits from rust due to a change in the rectangular profile of the groove to the blade profile.

Claims (1)

A swirler containing a housing, on the inner wall of which, from the inlet side of the fluid stream, guide grooves are made, and flanges are installed at the ends, characterized in that the guide grooves are made in the form of petals covering the entire perimeter of the inner surface of the housing, and the number of grooves is determined by the ratio D / 2, where D is the inner diameter of the main pipeline; the height of the groove h is 0.3d, where d is the wall thickness of the main pipeline, while the wall thickness of the body is d + 0.3d, and the length of the grooves in the swirl section is 10-15D, depending on the speed and mode of flow in the pipeline.