渦輪式流量計為目前市面上常見之流量計，其特點為可計量流量範圍大、壓力損失小、結構穩健及可使用年限長。此類型的流量計因其設計關係，葉片轉動時需要轉矩較大，因此在低流量時，反應較不靈敏，在低流量的計量時表現不佳。本研究目在於設計50mm口徑流量計之葉片，使之在低流量時，能有較好的性能表現。
本研究利田口實驗設計方法，設計L9直交表作實驗之依據，以葉輪翼型、輪轂直徑、葉片安裝角及扭轉角作為控制因子，並定義品質特性之理想機能，以望大作為指標，設計出流量計之葉輪組合，並使用CFD軟體模擬葉片在不同設計參數下對於流量計於低流量計量的影響，且與實機測試之結果比較。結果發現性能最佳的葉片，啟動流量為0.6m^3⁄hr、且在1m^3⁄hr、1.5m^3⁄hr、4m^3⁄hr不同的流量下與原始葉片比較之下有較佳的線性表現，此研究可做為未來設計高精度流量計之參考。

Axial Turbine flowmeters are widely used in measuring flowrates of liquids with high flowrate, less pressure loss, and robust structure for long-term application. But the impeller needs a large torque for rotation and leads to poor performance at low flowrates. In this research the geometry of the impeller blade was studied for improving the performance at low flowrates of the flowmeter of nominal size of 50mm flow mete.
The Taguchi method was employed to design an L9 orthogonal table for experimentation, using the airfoil blade type, hub diameter, blade mounting angle, and twist angle as the control factors. In addition, computational fluid dynamics (CFD) simulations were also conducted for the same configurations as the experiments so that comparisons with the experimental results could be made. The results show that the designed impeller which performed best achieved the starting flowrate of (0.6m^3)⁄hr, and had better linearity for the flowrates of 1 m^3⁄hr, 1.5 m^3⁄hr, and 4 m^3⁄hr. This provides a greater understanding of the effects of impeller design on the accuracy of turbine flow meters.

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