An experimental investigation was carried out on the performance of an ultrasonic heat meter with interference of non-uniformity from the upstream installation of a ball valve, which it is partly opened. It was found that the existence of the ball valve may under-report the flow, especially when the flow rate is low. From the measured PIV results, it can be found that the velocity distribution is obviously non-uniform inside the meter, and the change is remarkable when the inlet is added with a ball valve. The time resolved PIV results also demonstrate that the flow field becomes unsteady when slow down the flow rate, which might be responsible for the measurement deviation.
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