| 摘要 |
<p>An oscillating jet type of fluidic flowmeter, for use as a domestic water meter, is provided with a conditionning disc (6) at its entry to increase the linearity of the meter. The disc is mounted upstream of an elongate jet-forming orifice, being at the mouth of a convergent entry passage leading into the orifice. The disc can be in the form of a slotted plate, having three slots (12) separated by elongate bluff blocking regions (13), the slots and blocking regions being in parallel with the jet-forming orifice. The conditioning disc has the effect under laminar and transitional inlet flow conditions of flattening the velocity flow profile and introducing turbulence into the flow, whereby fully developed turbulent flow conditions become simulated at the orifice.</p> |
