S-type pitot tube coefficient calibration method based on CFD numerical calculation

Abstract

The invention discloses an S-type pitot tube coefficient calibration method based on CFD numerical calculation. The S-type pitot tube coefficient calibration method comprises the steps of constructionof a calibrated S-type pitot tube and a three-dimensional geometric model of a calibration wind tunnel, generation of a calculation grid, solving of a Fluent solver, result post-processing and S-typepitot tube coefficient calculation. According to the invention, a CFD numerical simulation method is adopted to fully consider the influence of the addition of the S-type pitot tube on the flow fieldin the wind tunnel; the complexity of a flow field around the S-shaped pitot tube is considered; the problem of high investment in the original S-shaped pitot tube real-flow test is solved; and the efficiency is low, the real flow mark timing is accurately reproduced; the flow field in the whole wind tunnel and the surrounding flow field form of the S-shaped pitot tube are formed; Therefore, theaccurate calculation of the S-type pitot tube coefficient is realized, a simple, efficient and low-price method is provided for the calibration of the S-type pitot tube in the future, the design costof the new S-type pitot tube and the calibration cost of the S-type pitot tube coefficient in use are greatly reduced, and the application prospect and the economic value are wide.

Description

technical field [0001] The invention relates to the field of pipeline measurement, in particular to an S-type Pitot tube coefficient calibration method based on CFD numerical calculation. Background technique [0002] S-type pitot tube is a typical type of measuring instrument used to measure the flow rate of flue gas. It is widely used in the field of environmental monitoring and verification of fixed emission sources. The S-shaped Pitot tube is welded back to back by two hollow metal tubes with the same shape and bending form. The probe ends are respectively opened in two directions. , the opening facing away from the gas flow direction is called the static pressure hole, and the end of the metal tube is connected to the micromanometer, which can measure the differential pressure between the total pressure hole and the static pressure hole. Then, the flow velocity at the S-type Pitot tube can be obtained by combining the Bernoulli equation and the Pitot tube coefficient. ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the coefficient calibration of the existing S-type pitot tube is mainly completed by the actual flow test of the calibration wind tunnel. The method has complicated steps and low efficiency. Low, lack of simple and efficient method to obtain the coefficient of S-type pitot tube through numerical calculation, now provides a calibration method of S-type pitot tube coefficient based on CFD numerical calculation, so as to solve the above problems

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