Simulation Analysis of Ultrasonic Guided Waves on Gas Flow Measurement

Clamp-on gas flowmeters based on ultrasonic guided waves are easy to installed, with a wide range of application, without affecting the pipe structure. In this paper, the gas flow measurement based on ultrasonic guided waves is studied. And the finite element simulation method is used to conduct guided wave excitation and gas flow measurement experiments on gas-containing pipelines. The excitation simulation of guided wave modes is performed at different frequencies on different material pipelines. The results show that the selection of the excitation signal frequency and guided wave modes needs to consider with the dispersion curve and the vibration displacement distribution of the guided waves on the pipe wall together. Finally, the flow simulation experiment of the gas-containing pipeline is performed. The ratio of the time difference between the simulation result and the theoretical value is constant, which further explains the necessity of the compensation coefficient in the flow measurement formula.