Abstract
Traditional acoustic flowmeters are difficult to use in small-caliber, low-velocity piping systems. In this study, a novel method for fluid velocity measurement in small-diameter pipelines is developed based on the characteristic of acoustic resonance and standing wave tube. This method solves the problem of mutual interference between bidirectional acoustic loops, and realizes the simultaneous measurement of bidirectional resonant frequency. The tiny variation of flow velocity in a small-diameter pipeline can be sensitive by measuring the difference in bidirectional high-order resonance frequency. Experimental results show that the measurement system with a 15 mm diameter pipe has good linearity and high sensitivity to low velocity. Hence, this new method widens the application scope of acoustic flowmeters, especially in small-diameter, low-velocity piping systems.
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