Analysis of signal characteristics of swirlmeter in oscillatory flow based on Hilbert–Huang Transform (HHT)

In the paper, firstly, on an experimental facility, we investigated the measurement characteristics of a diameter 50 mm swirlmeter in uniform flow and oscillatory flow. At the same time, the interference characteristics of oscillatory flow were studied. Then, the signal characteristics of swirlmeter in oscillatory flow were analyzed by Hilbert–Huang Transform (HHT) method. Results show that the response characteristics of swirlmeter in oscillatory flow are addition of that of swirlmeter in uniform flow and the interference characteristics of oscillatory flow. They further prove the conclusions which suppose that the correlation between the velocity pressures of fluid disturbs wave and that of vortex precession in swirlmeter is linear in the literature, and a new method for the oscillatory flow swirlmeter noise removal on HHT was provided.

► A diameter 50 mm swirlmeter in uniform flow was studied by experiment.
► The swirlmeter in oscillatory flow was studied by experiment.
► The interference characteristic of oscillatory flow was studied by experiment.
► We apply the Hilbert Spectral Analysis method of HHT to analyze those signals.
► The above three relations in Hilbert spectral were been found.