- 學位論文
二重反轉軸流風扇軟體自動化設計
Counter rotating fan designed by automatic programmable software
摘要
二重反轉風扇在伺服機中則是不可或缺的散熱工具，但隨著CPU 的速度越來越快，以及產品的設計越來越朝向輕薄短小，因此風扇產品在散熱品質上也必須有高度的要求，然而在有限空間的限制下，為了要讓風扇符合高效率、高轉速及低噪音的標準，扇葉的整體結構自然變的複雜，使得加工生產上所造成的加工問題也隨之複雜化，因此在風扇葉片的開發過程中，葉片必須經過多次的設計變更、加工與測試，來確保所生產的風扇是散熱佳、低噪音、且震動小，因此本研究設計出一套有效率之快速開發系統。 使用者輸入要求之靜壓、流量及其他參數後，可由本論文程式快速設計二重反轉風扇，且經由驗證後此程式計算出葉片參數為符合理想。於設計時可使用任意形狀之翼形，經由程式計算出其升力系數與攻角間關係，藉由改變攻角使葉片上靜壓相等，較不會產生渦流減少能量損失。NACA法可適用於小軸流風扇，經驗法適用於大軸流風扇，當比轉速小於500時，可採用經驗曲線來快速設計風扇，此設計方法可一次比較多種風扇，從中選取效率較佳者進行設計。
並列摘要
Two counter-rotating fan in the servo drive is an indispensable tool for cooling, but with the CPU speed faster and faster, as well as product design and more toward short, light, and therefore the cooling fan on the quality of the product must also have height requirements, but within the constraints of limited space, in order to let the fans meet the standards of high efficiency, high speed and low noise, the overall structure of the blades of the natural variability of the complex, making the processing problems caused by the production process also will complicated, so the fan blades of the development process, the blades must undergo several design changes, processing and testing, to ensure the production of a good cooling fan, low noise and vibration, this study devised a set of the rapid development of efficient systems. User input required static pressure, flow and other parameters after, by the thesis program quickly design a counter-rotating fan blades and the parameters calculated by the program to verify compliance with this ideal. In the design of the wing can use any shape through the program calculates the lift coefficient between its relationship with the angle of attack by changing the angle of attack of the blades so that the static pressure equal, less likely to generate eddy currents reduce energy loss. When the ratio is less than 500 specific rpm, the learning curve can be used to quickly design fan, this design approach can be a relatively diverse fans, which were selected to design better efficiency.