本研究於離心式風扇可分為二大步驟,首先設計出65×50×04 mm離心式風扇三款不同葉型葉片及蝸道的三維幾何外形後,利用CFX進行流場分析,選出可達最大風量之葉型,接著決定控制因子及水準,包括舌口間隙、扇葉葉片數目、上下入風口直徑扇葉外徑這4個設計參數,以田口直交表決定本實驗之風扇設計參數,在不改變風扇基本尺寸的情況下,依影響風扇性能和的比重,選出4個主要的風扇設計參數來作探討分析,也就是決定田口方法內的控制因子,配合田口方法設計的因子水準及直交表,決定各組實驗樣品的參數,再利用電腦輔助設計與製造來產生風扇樣品,可以實際量測得到離心式風扇性能數據,以進行田口實驗,其第二部分,將各組樣品實際量測所得到的風扇性能品質,用田口式方法來計算其中的S/N因子回應及變異數分析,對各個因子的水準強度做成回應表來決定因子間風性能最佳化的搭配組合,求得最佳化的風扇參數組合。
This study presented the optimum design of centrifugal fan by using Taguchi method. In this study, the sizes of centrifugal are 65-mm in length, 50-mm in width and 4-mm in height. CFX software provided by ANSYS Inc. was used to obtain the optimum airfoil type which can reach maximum air flow rate. The four design parameters obtained by Taguchi orthogonal array include the number of blade, diameter of impeller, entrance diameter, and tongue clearance. The samples of centrifugal fan made by CNC machine were measured to obtain the performance of centrifugal fan. Using the experimental results, the S/N factor and variance analysis were calculated by using the Taguchi method. This study made the table of response by using the weight of each factor. The optimum centrifugal fan can obtain by the table of response.