A method of multi-channel ultrasonic flow rate measurement based on piecewise curve fitting

摘要

For the case of complicated turbulent velocity distribution caused by the pipeline structure of hydraulic unit, a method of multi-channel ultrasonic flow rate measurement based on piecewise curve fitting is proposed. In this method, the line mean velocities are obtained by the multi-channel parallel layers measurement. According to the features of the fluid in the pipeline, a piecewise curve is fitted to the velocity of every measurement level, which is used to calculate the flow rate. With plenty of advantages, such as high precision, strong adaptability, wide range of applications and simple calculation, the method is worth to be extended in the flow rate measurement. In addition, combined with practical applications, a model of velocity distribution is created, and the simulation experiments are made to show the correctness and validity of the method.