Abstract
The effects of upstream velocity profile on the performance of orifice flowmeters were studied. Non-swirling maldistributed axial velocity profiles were obtained using a concentric pipe flow conditioner. Orifice flowmeters with β ratios of 0.43, 0.50, 0.60, 0.70 and 0.75 were installed downstream of the flow conditioner and operated at a Reynolds number of 54700 in a 50.4 cm pipe. Increasing the flow along the centreline of the pipe decreased the pressure drop across the orifice plate, resulting in increased discharge coefficients. The opposite was observed as the flow along the pipe centreline was decreased. The errors increased with increasing β ratio. A swirl generator was installed upstream of the β = 0.43 and 0.50 orifice plates. The swirl produced effecs opposite to the axial velocity. The change in discharge coefficient increased with decreasing β ratio.
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