伴隨科技的日新月異，工業每年消耗大量的電力來從事生產，然而能源
使用率卻不到50%，使得尋求替代能源及回收能源的方法勢在必行，在回
收能源上近來許多研究方向開始紛紛轉往超臨界循環發展。
本研究針對超臨界二氧化碳之布雷頓循環作初步設計，使用二氧化碳的
原因是基於其流體穩定性佳、臨界點條件低、取得來源難度低以及適用範
圍廣，並且可減少環境中的溫室氣體。
本研究參考Baljie 的比速比徑關係圖，以及其他壓縮機葉片設計相關的
文獻，建構出初步的一維尺寸與角度，並經由ANSYS 與文獻[35]驗證，比
較同一個轉子葉輪之壓力分布圖、效率與壓縮比，模擬結果誤差皆在6%以
內，接著在轉子設計點上，藉由中心線設計(meanline design)繪製出壓縮機
葉片與轉子，並參考不同關於尺寸間的比例與進出口角度的文獻，定義出
細部的尺寸與角度關係，接著使用ANSYS中的BladeGen 設計岀幾何模型，
利用TurboGrid 進行網格切割，並測試網格獨立性，最後將模型匯入CFX 設
定邊界條件，壓縮機葉片之模擬效率約為50%，接著與使用理想氣體(Air
Ideal Gas)做為工作流體的模擬結果比較後，發現使用理想氣體之壓縮機轉
子效率只有25%，證明超臨界二氧化碳在發電熱效率上有顯著的優勢。

Accompanied by the prosperity of technology, the electricity needed for
production is increasing year to year. However, the overall efficiency is not above
50%, and thus it will produce large amount of carbon dioxide and waste heat. It
will give rise to the global warming aggravation and the air pollution, sour rain,
ozonosphere holes and the destruction of forest…etc. So this paper intend to find
an solution to finding alternative energy and recovery of waste heat, with the
increasing literatures focusing on the super critical cycle in the energy recovery
field.
This paper put aim on the super critical Brayton cycle to make the first
compressor design. According to the Sandia Laboratory’ reports, the overall
efficiency of the combined cycle can be high above 50%. The reason to use carbon
dioxide to be the working fluid is due to its stability, low critical condition, large
range of application and capable of reducing the global warming.
This paper design the prototype of the blades and rotors of the compressor.
And then, by using ANSYS this paper propose a layout of the rotor and blade which
can bear high temperature and pressure(7.8~15 MPa, 300~500K). And this model
has been verified by comparing the simulation results with the paper [35]. The
results are quite similar where the errors are below 6%. The efficiency of the
impeller is about 50.1%, compared with the 25% efficiency of the impeller by using
Air Ideal Gas as working fluid. It has been proven that the SCO2 compressor
impeller is the best choice over the conventional Rankine cycle and the Brayton
cycle by Air Ideal Gas. With the advantages of high rotating speed and the low
volume, the pressure ratio of this compressor is about 1.85; the efficiency is about
50%.

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