Abstract
A numerical model is built up to predict the flow around turbine flowmeter blades. In this model, the separated leading edge flow and the trailing edge wake are simulated by shed vortices. To simplify the application of the model for turbine flowmeter performance prediction, a relation between the reattachment lengths of the separated leading edge flow with the blade geometry and incidence angle is obtained from a number of simulated representative cases. A simple method is developed to modify the leading edge contour to simulate the displacement effect of the separated leading edge flow at different incidence angles and Reynolds numbers. The leading edge modifications to any other flow cases of the flowmeter are directly obtained by using the modification method with the reattachment length from the derived relationship. The predicted leading edge reattachment lengths of flat plates are compared with some experimental data and the modified flowmeter blades show accurate simulation of the displacement effect of the separated leading edge flow. Thus the aerodynamic characteristics of the flowmeter blades are obtained for flowmeter performance prediction.
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