Large-aperture gas flow calibration device capable of providing two flow fields

Abstract

The invention discloses a large-aperture gas flow calibration device capable of providing two flow fields. An outlet end of air source equipment is provided with a measuring pipe, a straight pipe and a calibrated meter mounting pipe, of which the central lines are in a straight line; an air outlet of the measuring pipe is connected with an air inlet of the calibrated meter mounting pipe through the straight pipe; an air inlet pipe, an intermediate pipe and an air outlet pipe, of which the central lines are in a straight line, are arranged between the air source equipment and an air inlet of the measuring pipe; the air inlet pipe is a conical pipe; a small-aperture end of the air inlet pipe is connected with the outlet end of the air source equipment, and a large-aperture end of the air inlet pipe is connected with an air inlet of the air outlet pipe through the intermediate pipe; an air outlet of the air outlet pipe is connected with the air inlet of the measuring pipe; the aperture of the air outlet pipe gradually reduces from the air inlet to the air outlet, so that a contour line of the pipe wall of the air outlet pipe forms a witozinsky curve; and a flow straightener is arranged in the intermediate pipe. Through the device, a uniform flow field can also be provided on the premise of providing a fully developed flow velocity distribution flow field.

Description

technical field [0001] The invention relates to a large-diameter gas flow standard device capable of providing two kinds of flow fields, which is used for calibrating the flowmeter. Background technique [0002] The traditional large-diameter gas flow standard device includes air source equipment, which is generally a fan or a compressor. A measuring tube, a straight tube, and a meter installation tube are arranged at the outlet of the air source equipment. The measuring tube, straight tube and The center line of the installation pipe to be calibrated is on a straight line, and the air inlet of the measuring pipe is connected to the air outlet of the air source through a flow straightener, and the air outlet of the measuring pipe is fed into the installation pipe to be calibrated through a straight pipe The flow meter to be calibrated can be installed on the meter installation pipe to be calibrated. At the same time, a standard velocimeter is installed on the measuring tube...

AI Technical Summary

Problems solved by technology

If the airflow is not a uniform flow field when passing through the standard velocimeter, it takes a very complicated method to obtain a relatively accurate standard flow rate of the airflow

At present, there are generally two technical solutions: one is to connect multiple standard flowmeters in parallel on the measuring tube, but it will lead to a more complicated structure of the whole device, and greatly increase the construction and production costs; the other is to measure the cross-section of the measuring tube Multiple standard velocimeters are installed at different positions inside, and these standard velocimeters measure the flow velocity at different points of the measuring tube at the same time, and then we comprehensively calculate the measured values ​​to obtain the standard flow rate. The measurement and calculation are cumbersome and complicated, and The accuracy is not high, for this reason, it is urgent to solve the above technical problems

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