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Resonant characteristics of ﬂow pulsation in pipes due to swept sine constraint

Pałczyński T.

Transactions of the Institute of Fluid-Flow Machinery

2016

nr 133

131--144

A fast and easy to use method for analysing the amplitude frequency characteristics of pulsating ﬂow in pipes with a sine sweep input function is presented. The key element is the sweeping excitation of the pulse generator frequency which generates fast whole-spectrum resonance (from 20 Hz to 160 Hz). A case study describes tests conducted into the applicability of the method for research into pulsating ﬂows. First, the test rig is brieﬂy described, along with the main assumptions of the research. Next, theamplitude frequency resonance dueto swept oscillations is estimated for increasing, decreasing and changeable input mass ﬂow rates. These characteristics are approximated based on a second-order transfer function. Following such assumptions, the damping coeﬃcients and resonance frequencies are estimated. The inﬂuence of the direction of the frequency sweep method (increasing or decreasing) on the resultant resonance frequency is also investigated.