| 摘要 |
A turbine flowmeter having a passageway extending completely through its rotor or shaft. The rotor has an upstream diffuser on one side and a downstream diffuser on its other side. Accuracy and range are increased without an increased pressure drop. When the passageway is located through the rotor, accuracy over a linear range is increased further because fluid in the hole is angularly accelerated. This acceleration places a drag on the rotor which increases the meter linearity at low flow rates. Drag is decreased at high flow rates because the rotor moves close to the upstream diffuser and acts as a restriction on passageway flow. High flow rate accuracy is thus maintained.
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