Computational fluid dynamics (CFD) technology-based method for optimizing acoustic path of multi-path ultrasonic flowmeter assembled in elbow pipe

Abstract

The invention provides a computational fluid dynamics (CFD) technology-based method for optimizing an acoustic path of a multi-path ultrasonic flowmeter assembled in an elbow pipe. The method mainly comprises the following steps: calculating a Reynolds number, a Dean number and a boundary layer thickness according to pipeline conditions; modeling a pipeline and the flowmeter by utilizing three-dimensional modeling software, and assembling a pipeline model and a flowmeter model according to different assembly angles; selecting CFD software, and introducing the assembled models and setting parameters; simulating the flow field distribution of different flow speeds, recording the average flow rate at an inlet, and calculating the flow rate of the section of the acoustic path; linearly fitting the calculated flow rate errors of each group, and correcting the errors of each group according to the fit slope; screening the group with the minimum error fluctuation range in the flow speed range, and taking the acoustic path section, acoustic path number and assembly angles of the group as an optimal acoustic distribution scheme under the pipeline characteristic condition. The CFD technology-based method for optimizing the acoustic path of the multi-path ultrasonic flowmeter assembled in the elbow pipe can be used for guiding to reasonably select the acoustic path number measurement section and assembly angles of the multi-path ultrasonic flowmeter under an assembly condition without a straight pipe section.

Description

technical field [0001] The invention relates to an acoustic path optimization method for installing a multi-acoustic ultrasonic flowmeter in an elbow section based on CFD technology, especially referring to the use of CFD software to simulate the flow field distribution in an elbow and adjust various parameters of the multi-acoustic ultrasonic flowmeter. The test accuracy of the multi-sound path ultrasonic flowmeter can adapt to the distribution of the flow field. Background technique [0002] With the global shortage of energy and water resources, a number of large-scale water conservancy projects and water diversion projects related to the national economy and people's livelihood have developed rapidly in my country, such as the Three Gorges Water Conservancy Project and the South-to-North Water Diversion Project. These engineering projects often include pipelines with huge caliber and flow rate, such as water inlet pipelines of hydropower units, which cannot be adapted b...

AI Technical Summary

Problems solved by technology

For the multi-channel ultrasonic flowmeter to measure the flow rate of the standard straight pipe section, there is a relatively well-formed model, but for the straight pipe section that does not have the installation requirements and needs to be installed at the bend, the research on how to ensure the measurement accuracy is almost blank

Images