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Method for measuring influence degree of elbow pipe in different characteristic flow fields

A technology of influence degree and characteristic flow, which is applied in the direction of measuring devices, machine/structural component testing, instruments, etc., can solve the problems of not being able to query the measurement results of the elbow, and it is difficult to measure the flow field space of the elbow parts, so as to achieve the convenience of comparison effect on analysis

Pending Publication Date: 2021-09-24
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the limitation of the flow field space where the elbow parts are located and the particularity of the flow field, it is difficult to measure the flow field space where the elbow parts are located, and the relevant measurement results of the elbow cannot be queried. Therefore, it is necessary to design a method that can solve the above technical problems , the method of measuring the change of the flow field near the elbow

Method used

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  • Method for measuring influence degree of elbow pipe in different characteristic flow fields
  • Method for measuring influence degree of elbow pipe in different characteristic flow fields

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] As shown in the figure, the method for measuring the degree of influence of elbows in different characteristic flow fields of the present invention includes the following steps:

[0043] (1) Install the elbow on the elbow bracket, and the elbow bracket is fixed in the wind tunnel, start the wind tunnel, adjust the wind speed to 200m / s, 500m / s and 860m / s respectively, and take pictures of the head of the elbow Shock wave state diagram, and measure the velocity distribution of the forward tip of the elbow head, and calculate the first vorticity value, which is calculated by the following formula: where ω is the vorticity, is the wind speed;

[0044] (2) Start the rotating disc set under the elbow bracket, adjust the rotation frequency of the rotating disc to 3, 50 and 100Hz, and start the wind tunnel, adjust the wind speed to 200m / s, 500m / s and 860m / s, and shoot The shock wave state diagram of the elbow head, measuring the velocity distribution of the forward tip of t...

Embodiment 2

[0057] As shown in the figure, the simulation test device for measuring the degree of influence of elbows on different characteristic flow fields of the present invention includes elbow brackets, rotating disks, airflow baffles, wind tunnels, tungsten wires, resistors and galvanometers;

[0058] The elbow bracket is provided with three elbow clamping stations, the elbow is mounted on the elbow clamping stations through clamping screws, and the elbow bracket is installed in the wind tunnel;

[0059] The rotating disk is mounted on the lower part of the elbow bracket;

[0060] The airflow baffle is installed in the measured wind tunnel to make the airflow in the required state;

[0061] The tungsten wire is arranged at the head of the elbow, and the tungsten wire is electrically connected with the resistor and the galvanometer.

[0062] Furthermore, the elbow bracket is arc-shaped.

Embodiment 3

[0064] The method for measuring the degree of influence of elbows in different characteristic flow fields of the present invention comprises the following steps:

[0065] (1) Install the elbow on the elbow bracket, and the elbow bracket is fixed in the wind tunnel, start the wind tunnel, adjust the wind speed, take a picture of the shock wave state of the elbow head, and measure the forward direction of the elbow head The velocity distribution at the tip of , and the first vorticity value is calculated, which is calculated by the following formula: where ω is the vorticity, is the wind speed;

[0066] (2) Start the rotating disc set under the elbow bracket, adjust the rotation frequency of the rotating disc and start the wind tunnel, adjust the wind speed, take a picture of the shock wave state of the elbow head, and measure the forward tip of the elbow head The velocity distribution of , calculate the second vorticity value;

[0067] (3) Install the airflow baffle in the...

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Abstract

The invention discloses a method for measuring the influence degree of an elbow pipe in different characteristic flow fields, which comprises the following steps: arranging the elbow pipe in a wind tunnel through an elbow pipe bracket, respectively adjusting a rotating disc and the position of the elbow pipe bracket, adjusting different wind speeds, shooting a shock wave state image set of the head of the elbow pipe and speed distribution of different positions near the head of the elbow pipe, calculating a vorticity value, pasting a tungsten filament to the head of the bent pipe, the tungsten filament being connected with a resistor and a galvanometer, adjusting the custom, the airflow flow and the airflow pressure in the wind tunnel respectively, and performing contrastive analysis with a calibration curve. According to the invention, the change condition of the flow field near the bent pipe is measured, the change condition of the influence of different positions and airflow effects on the airflow when the boundary dimensions of the bent pipe are different is mastered, and a basis is provided for control, optimization and design of the temperature field near the bent pipe.

Description

technical field [0001] The invention belongs to the technical field of flow field control, and in particular relates to a method for measuring the degree of influence of an elbow on different characteristic flow fields. Background technique [0002] In the special equipment for air flow treatment, it is necessary to use the elbow to improve and control the original flow field. Since the air flow near the elbow is in a supersonic flow state, and there are pressure gradients and velocity gradients, shock waves are generated by the action of the elbow, making the surrounding Changes in gas flow affect the power consumption of the elbow, which in turn affects the temperature distribution and physical properties of the elbow. [0003] Therefore, it is one of the important data to be investigated in the process of measuring the air velocity distribution near the elbow, investigating the shock wave shape, the change of turbulence characteristics and its relationship with the power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 赵君王永华刘巍
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND