Abstract
A model for the prediction of turbine flowmeter performance is developed here. In this model, the driving torque on the flowmeter rotor is obtained from the calculated aerodynamic characteristics of the blades by using the numerical model developed previously for the flows around turbine flowmeter blades. The boundary layer friction on the flowmeter blade surfaces depends on the state of the predicted boundary layer at the reattachment point of the separated leading edge flow and the Reynolds number. The friction inside the bearing is calculated according to the bearing lubrication state. An experimental study is conducted to investigate flowmeter performance with different inlet swirls and to validate the performance model. The predicted results show good agreement in the case without inlet swirl and reasonable agreement in the cases with inlet swirl.
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