高性能電腦風扇之快速設計與開發

Rapid Design and Development for High Performance PC Fan

何秉倉(Ping-Tsang Ho)

指導教授 ： 汪家昌

國立臺北科技大學/機電學院/製造科技研究所/碩士(2006年)

摘要

本研究主要目的是整合CAD/CAE/CAM系統，並配合田口實驗設計法來設計出高性能之電腦風扇，並以快速原型及傳統NC之原型製作來驗證風扇之性能。研究首先分析對風扇設計之影響因子與建立主要影響因子之水準後，以田口實驗設計法規劃直交表，利用Fan Designer設定翼型，並使用PRO-E繪出風扇之3D圖形，與用STAR-LT之數值風洞模擬風扇性能曲線(P-Q curve)，再以快速原型LSA及Pro-CAM電腦輔助製造模擬切削路徑，確認是否有撞刀、干涉、與過切之情形進行原型加工，最後做出實物進行最佳化結果的驗證。
研究結果顯示，在執行田口實驗後，以合計20次的數值模擬與20次的實物驗證比較下， 之準確度於5%以內，非常接近實體風扇流量；操作區雖與實體差距16%左右，但都呈現正相關且穩定關係，也甚具參考性。產生差距的原因，主要是因為實體風扇實際運轉時，於操作區附近都會產生失速的現象，而數值分析在此區域不易於運算此現象所致；至於 處，因背壓持續增加，在此區域模擬易導致流體回流，而呈現不穩定之結果，所以不具參考價值。
由於業界實際用於解熱的區域一般都在失速區附近，而本實驗於失速區的數據均呈現穩定且正相關的關係，因此證明CAE軟體已具相當程度之準確性，並在配合田口分析之後，確實大幅縮短研發時間及原型製作之成本。

關鍵字

CAD ； CAE ； CAM ； 田口實驗設計法

並列摘要

This study is applying Taguchi method for high performance computer cooling fan designed by way of the integration of CAD/CAE/CAM systems. At the beginning of this study, the possible performance influencing parameters were analyzed, and the most effective parameters for further optimization were conclouded. The fan models were drawn by Pro-E software, base on the parameter stated the Taguchi method. The P-Q curves, referring to the performance of the fan models, were created in CAE using STAR-LT software. The physical fan models using the set of parameters combination were machined with the help of Pro-CAM software.
Finally, the mockups were tested to verify the results with the CAE simulation. From the results of experiment, it took 20 sets of numerical simulation and mockups.Compared with the simulation and Mockups, the value of the simulation was very close to the flow of the mockups fans. The difference was less than 5%. Although the operating area had about 16% deviation from mockups, however they were all constructively correlated and stabilized. The reason for this deviation was that the fans stalled in the operating area. The fan stalled when the pressure continuously increased in the high pressure area, and it caused fluids to flow back seriously. It has no valuable on the area. The numerical simulation could not able to imitate the above phenomenon.
The fan industry uses fans to solve the overheating problem, usually always in the region of the stall area. This P-Q curve data of the fan`s stall area in the experiment relates positively to the simulation. It proves that eventhough the CAE software cannot show the accurate values, but it already gives the trend. By the integration of CAD/CAE/CAM systems and application of the Taguchi Method to the fan design, the proposed rapid design technique can really accelerate the speed of fan design and reduce the material cost.

並列關鍵字

CAD ； CAE ； CAM ； Taguchi Method

參考文獻

Design ” Mc Graw Hill, 1998

Treatment for Axial Flow Compressors”, Nippon Kikai Gakkai

[14 ] Miyake, Y., Inaba, T., and Nishikawa, Y., “A study on the flow within the Flow Passage of an Axial Flow Fan Equipped with Air-Separator”, Bulletin of JSME, Vol. 29, No. 256, Paper No. 256-23, Oct. 1986, pp. 3394-3401.

[15] Kenji Kaneko, Toshiki Setoguchi, Toshihiro Nakano and Masahiro Inoue, “Effect of Blade Surface Roughness on Performance of Axial Flow Fans with Different Blade Cambers”, Nippon Kikai Gakkai Ronburnshu, B Hen / Transactions of the Japan, Vol. 50, No. 459,， 1984, pp. 2812-2917.

[16] Dowine, R.j.; Thompson, M.C. and Wallis, R.A., “An Engineering Approach to Blade Designs for Low To Medium pressure Rise Rotor-Only Axial Fans”, Experimental Thermal and Fluid Science, Vol. 6, No.4, 1993, pp.376-401.