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Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter

A technology of uniform velocity tube flowmeter and large flow of gas, which is applied in the field of flowmeter calibration to achieve the effect of good equipment versatility and high accuracy

Inactive Publication Date: 2009-09-09
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the calibration problem of the uniform velocity tube flowmeter of the large-diameter and large-flow gas pipeline

Method used

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  • Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter
  • Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter

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Embodiment Construction

[0017] The invention proposes a wind tunnel calibration method for a gas pipeline flowmeter with a large diameter and a large flow rate. The specific implementation process is as follows:

[0018] According to the calibration size of the flowmeter, a wind tunnel needs to be established. This wind tunnel has the same requirements as the general straight-through low-speed hydrodynamic wind tunnel. The working section of the wind tunnel is used as the test section for flowmeter calibration. Such as figure 1 As shown, under the action of the axial flow fan 11, the air enters the wind tunnel after being rectified by the honeycomb 1, the damping net 2, the stabilizing section 3 and the contracting section 4 of the wind tunnel, and then enters the wind tunnel test section 5. The cross-sectional velocity distribution of the wind tunnel test section 5 is very uniform. Therefore, a pitot tube 6 and the flowmeter 8 to be calibrated are inserted into the wind tunnel test section at the s...

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Abstract

The invention discloses a wind tunnel calibration method for a large-flow gas pipeline uniform velocity tube flowmeter. The flowmeter to be calibrated is tested in the wind tunnel test section to obtain the flow velocity coefficient of the flowmeter, and then combine the velocity distribution correction coefficient to obtain the flow coefficient of the flowmeter. In this calibration method, regardless of the length of the flowmeter, as long as it is smaller than the section size of the wind tunnel, it can be inserted into the calibration section for calibration, and the equipment has good versatility. The velocity distribution correction coefficient needs to be measured and accumulated in the database through experiments on a special experimental system. The velocity distribution correction coefficient experimental system is equipped with two calibration sections, the wind tunnel test section and the fully developed pipe flow test section. Under the same flow rate, the flowmeter to be calibrated is located in the wind tunnel test section and the fully developed pipe flow test section respectively. Measurements are made to obtain velocity profile correction factors. The speed distribution correction coefficient obtained by the invention has high accuracy and high data reliability.

Description

technical field [0001] The invention relates to a flowmeter calibration technology, in particular to a wind tunnel calibration method suitable for large-flow gas pipeline uniform velocity tube flowmeters. Background technique [0002] There are two types of calibration methods for plug-in averaging tube flowmeters: flowmeter method and velocity meter method. The flowmeter method is to test the entire sensor, including the measuring head, insertion rod, insertion mechanism, converter and measurement pipe (instrument housing). The general gas flow standard device is designed according to the flowmeter method, and its experimental methods can be divided into volumetric method, mass method, standard flowmeter method and velocity area method. Among them, for the case of large flow rate, the more typical devices include bell jar type gas flow device, PVTt method gas flow standard device, Mt method gas flow standard device and sonic nozzle. [0003] The bell type gas flow device ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/02
Inventor 张洪军苏中地田亚农谢文
Owner CHINA JILIANG UNIV
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