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離心泵葉輪幾何分析與五軸數值控制加工

Geometry Analysis and Five-axis NC Machining for Impeller of the Centrifugal Pump

作者:傅ㄧ中
畢業學校:正修科技大學
出版單位:正修科技大學
核准日期:2010-02-22
類型:Electronic Thesis or Dissertation
權限:Copyright information available at source archive--CSU University....

中文摘要

摘要
離心泵為非排量泵中應用最廣、產量最大之類型,其工作原理乃是利用葉輪高速旋轉離心力作用,將流體的壓力與速度提高之後,將流體由葉輪出口排至一渦形室(Volute)中減速,將動能轉變為壓力能,達到加壓的目的。離心泵葉輪為複雜的三維扭轉曲面,其流體沿曲面來改變流向、速度與壓力,使能量提升。本文主要目的主要是對葉輪進行幾何設計、數值模擬與數控加工,欲達到理想之葉片設計,除泵浦性能表現的考量外,必須顧及運轉穩定性以及葉輪製造與加工等問題。
葉輪幾何設計主要將葉片幾何參數化,配合「歐拉理論」與「速度三角形」決定初始葉形的幾何參數值。本文以Bézier曲線作為三維扭轉葉片的均線設計,以CAD建構葉片的三維外型。利用計算流體力學模擬分析軟體,以計算離心泵之效能,並評估不同曲線設計所產生流場特性的影響。並透過結構有限單元分析軟體之輔助,探討流體施加於葉片之負載,所產生的應力分布狀況與變形量。
為完成葉輪的精密加工,乃以Unigraphics NX的製造模組產生五軸銑削加工的刀具路徑,並將此刀具位置檔經由後處理器轉換成五軸加工機的NC程式,經實體切削模擬軟體,模擬實際切削狀況。

英文摘要

ABSTRACT
The centrifugal pump has been popular in the fluid transport equipment. In order to obtain blade profile which could generate excellent hydrodynamic performance and structure reliability, the purpose of this research is to analyse the flow field and stress distribution for variant centrifugal impellers. The toolpath generation method for five-axis NC machining of impeller is also studied in this thesis. The flow rate, head and rotational speed are according to dimensionless specific speed and practical conditions.
The design parameters of impeller profile are planned based on the requirement of geometric modeling. The impeller profiles are determined through the Euler theory and the velocity triangle. The impellers with different orders of Bézier curve are also modeled. The geometric model and the assembly of the centrifugal pump components are constructed using the CAD/CAM software. The computational fluid dynamics software is used to analyse the flow performance. In order to evaluate structure reliability, the CAE software (ANSYS) is introduced in this research. Through the comparisons in flow field simulation and structure analysis, the result show the impeller with second order of Bézier curve has better performance.
The toolpath of impeller generated by the CAD/CAM software (Unigraphics NX) is verified through the solid cutting simulation. The cutting simulation results show that the machining process works well and the interference does not occur.


口試委員 - 李政男

口試委員 - 王心德

口試委員 - 王進猷

指導教授 - 李政男


 

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