離心式壓縮器的應用廣泛，如渦輪增壓器即為一個例子。由於環保及某些國家之稅金制度，使得汽車引擎走向小排氣量發展，但引擎之動力表現受限於引擎排氣量，因此小排氣量引擎外加渦輪增壓器即成為車廠欲提升動力表現的一種手段。由此可發現高效率之渦輪增壓器對於汽車工業的重要性，且離心壓縮器為渦輪增壓器其中一個重要的部分，因此離心式壓縮器的研究將扮演著重要的角色。本研究首先應用壓縮器一維設計工具設計一個原始壓縮器葉輪，再配合最佳化使原始壓縮器效率提升，最後再應用計算流體力學軟體(ANSYS CFX)對壓縮器的三維流場進行模擬分析，數值方法則以有限體積法求解三維雷諾平均Navier-Stokes方程式。分析進口、出口以及葉柵面的紊流動能，發現紊流動能分佈與熵值分佈的情況相近，由此推論流場能量的消耗主要來自紊流的擾動。由壓縮比與效率曲線圖發現，最佳化後之葉輪的效率最大值為90%，而原始葉輪效率最大值為85%，且最佳化之葉輪工作於低轉速時可有較大之壓縮比。由結果可以發現除了設計點之效率提升7%，最高效率點亦提升5%。未來可再針對葉片的設計進行葉片的優化，並配合葉輪應力分析，改善葉輪內流場，以再增進葉輪之性能。

In this thesis, the objective of the research is to enhance the efficiency of the centrifugal compressor. An original centrifugal compressor impeller is designed first, and the impeller will be modified and improved its efficiency. The process of design and verification of impeller can be divided into three parts, including impeller preliminary design, optimization of impeller, and flow simulation. In the first part, impeller preliminary design which is carried on by one-dimensional design tool. In the second part, the efficiency of impeller is improved by the optimization tool, and the flow investigation of the original as well as optimized impeller are simulated by the computational fluid dynamics software(ANSYS CFX). The results show that the optimized impeller has higher both maximum efficiency (90%) and pressure ratio than those of original impeller.

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