摘要
泵浦係人類生活不可或缺的必需品，其中離心泵的優點是構造簡單便於製造，且有較高之靜壓效率而成為最廣泛使用的泵浦，故提升其靜壓效率也成為本文之研究目標。另外，因CFD模擬技術已趨近成熟，故本研究採用套裝軟體Ansys Fluent為主要分析工具，首先模擬原始設計泵浦之流場，探討其流場型態、性能和效率，並彙整提出流場缺失；觀察到葉片間存在嚴重渦流，因此據以擬定多項葉輪改良之方案，考量參數包括葉輪入口面積、葉片出入口角、葉片數、葉輪高度以及導流小翼等，最後再搭配不同出入口管徑以改善汽蝕現象。
從參數分析的數值結果可知，葉輪入口面積適度縮小與增加葉片，皆有助於提升泵浦性能，且優化改良方案相較於原始設計可增加4.44 % 最大壓力。但此靜壓提升仍對高阻抗的應用環境不明顯，且輸出流量也高於實際需求，因此藉由泵浦定律在固定需求功率下，結合縮小葉輪高度與提升轉速方式，犧牲部份的流量將其最大壓力作強化，成功地將最大壓力增幅達到原始設計的15.36 %。另外設置小翼做最適化設計來引導流體，達到大幅減少葉片間之渦流和提高能量使用效率，數值計算與分析結果顯示，相較於原始設計提升6.6 % 的效率；最後將葉輪搭配多種出入口管徑，來改善泵浦汽蝕現象，並重新審視葉輪入口面積，以確保改良泵浦之性能達到最佳值。
歸納上述系統化CFD計算與評估結果，本研究得到最大壓力、最高效率與最佳汽蝕改善的改良方案，其中最大壓力方案令原始設計的71.41 psi提升至82.51 psi；最高效率方案從49.9 % 提升至56.5 % 之靜壓效率，而最佳汽蝕改善方案在汽蝕易發生的葉輪入口處，其平均壓力相較於原始設計增加41.38 %，有效地降低汽蝕現象之可能。基於高靜壓應用需求考量下，在此選定最大壓力方案和原始設計之完整性能曲線作評比，結果顯示在中高壓的操作需求時，都可提供比原始設計更高壓力的輸出，且最大壓力值和效率也提升達15.34 % 和5.94 %。綜合上述成果顯示，本文所設計的高壓離心式泵浦之性能大幅提升，且所建立之設計流程及參數評估方法，也適用於其他型式泵浦的開發，更可提供為後續研究之重要參考。

Abstract
Among various pump types, centrifugal pump is widely used due to its high static efficiency and simple structure for easy manufacture. Thus, increasing the static pressure and the efficiency of centrifugal pump are in great demand and become the goal of this thesis. With the aids of CFD technology, this study firstly selects Ansys Fluent as the analysis tool to examine flow field, aerodynamic performance, and static efficiency of the reference pump. It follows that serious circulation and reverse flow are visualized within the blade passages, which lead to propose a systematic study on the impeller. The parameters considered here include rotor inlet area, blade angle, blade number, rotor height, and guiding blade inside the blade passage. Consequently, the associated CFD results indicate that reducing the impeller inlet area and increasing the blade number properly can enlarge the maximum pressure by 4.44 %, which is still not sufficient for the high-impedance applications.
Thereafter, several pump alternatives with correlated variations on both rotor height and rotational speed are checked within the framework of pump law under the same power-consumption and rotor-diameter constraints. As a result, a 15.36% increase on maximum pressure is achieved while no significant improvement on the adverse circulation inside blade passage is found. Hence, a thorough investigation on adding the guiding vane between blades is executed to diminish the circulation phenomenon and attain a 6.6% increase on static efficiency. Lastly, several inlet and outlet ducts are connected with the pump to weaken the cavitation possibility by adjusting the pressure distribution. Consequently, this study obtains three proper pump designs aiming to have the best performance on static pressure, static efficiency, and cavitation improvement, respectively. The pressure-orientated pump design can enlarge the maximum static pressure from 71.41 psi to 82.51 psi, which represents a 15.5% increase. And, the energy-efficient pump enhances the original 49.9 % to 56.54 % static pressure efficiency. Moreover, the average pressure on the impeller entrance is higher than that of the original pump by 41.38 %, which effectively reduces the cavitation possibility. In conclusions, the comprehensive design scheme established here has successfully generated proper pump designs to meet different system requirements, and can be used to develop other pump types.

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