高轉速離心鼓風機設計參數對性能影響

The Influence of the High Speed Centrifugal Blower Design Factor on Performance

洪顥庭(Hao-Ting Hung)

指導教授 ： 鄚榮和

國立臺灣大學/工學院/機械工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.02143

摘要

鼓風機的發展和工業科技進步息息相關，廣泛應用於國民經濟各部門，在燃料電池系統中亦是如此。專用鼓風機除提供陰極氣體之外，在系統之中亦為主要內耗元件，影響燃料電池。設計鼓風機，需要針對其外在操作環境狀況和功能的要求，方能得到比較好的設計尺寸和結果。
本研究針對燃料電池系統的要求，找尋國外廠商的鼓風機產品做為改良原型。除了參閱相關經驗公式外，亦使用CFD軟體觀察內部流場，做為改良設計和參數的依據，例如增加葉片高度、改變葉輪側板設計等，並應用這些相關知識，將廠商的產品做系統化的參數改良，以符合所使用的5kW燃料電池系統的實際要求。
該廠商產品在流量0.5CMM下，靜壓輸出為8,300Pa，效率70%。經過設計改良後，將可使靜壓輸出提升至11,443Pa，效率表現達到82.5%。本研究證實應用這些知識，觀察流場現象以提出改善方法，是有實質效用且可以實際應用於高性能之高轉速鼓風機之改良。

關鍵字

高轉速 ； 離心式鼓風機 ； 設計改良 ； 計算流體力學 ； 燃料電池系統

並列摘要

The air-blower development is closely bound up with industrial scientific and technological progress, and applies to every department of national economy extensively, included the system of the fuel cell. The special-purpose air-blower, except offering air to the cathode in the stack, and it is also a main component which efficiency is a critical factor in maximizing the overall efficiency of the fuel cell system. To design the air-blower needs to understand its operating environment and requirement, so that we can get better design size and result.
This research directs against the requirement for the system of the fuel cell, look for the air-blower products of the foreign manufacturer as the improving prototype. Besides consulting relevant empirical formulae, also use CFD software to observe the inner flow, as the improving bases and strategies to improve the problem found in inner flow region, for example increase the impeller highly, change the impeller side board to design etc., and employs these relevant knowledge to improve the parameter of the manufacturer product systematized, in order to fit 5kW fuel cell system's requirement.
Under the flow 0.5CMM, the product of manufacturer provides 8,300Pa in static pressure, 70% in efficiency. After designing and improving, it provides 11,443Pa in static pressure, 82.5% in efficiency. This study verifies that employing the knowledge, observing the phenomenon in the flow to propose improving method, have essence utility and can be actually applied to the improvement of the high performance, high rotational speed air-blower.

並列關鍵字

high rotation speed ； centrifugal blower ； blower improve method ； CFD ； fuel cell system

參考文獻

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