翼型後傾式離心風機之設計參數分析與風輪製作省力化之研發

工業通風機應用非常廣泛，離心風機有一定的市場需求。加上近年來由於節能減碳環保意識逐漸提升，促使風機業者尋求高性能、高效率的風機，才是未來的趨勢。本研究使用翼型葉片取代傳統板型葉片，利用CFD軟體及實驗設計之手法尋找高效率離心風機之參數。首先以全因子實驗分析NACA 8411葉片之安裝角、出口角、弦長等參數，研究發現空氣沿著翼型幾何形狀流動比傳統板型更加順暢，即全壓效率由原始板型者之75.2%提升至78%，即全壓效率提升約為3%，因此確信翼型葉片為高效率風機之趨勢。由於NACA系列翼剖面型號相當多種，因此進行NACA翼剖面之縱座標比例值、橫座標比例值、最大厚度做為直交表之因子實驗分析，再將風機關鍵零組件之喇叭口與蓋板微小幅度調整。由模擬結果得知，翼型離心風機最佳之葉片弦長與風輪外徑比為0.318，翼型葉片最大厚度與弦長比值為1:12.5。本研究以NACA 6508翼型葉片得最佳模型全壓效率為82.19%，大幅提升總體效率9.3%。改善後一台風機可節省約4,900度(約14,000新台幣)之年電量，每年又可減少3.14噸二氧化碳排量，達到節能減碳。本研究另協助國內知名風機業者廠商，改善離心風機關鍵零組件之風輪製程，選用風輪製程省力化，其分為四個工作站，主要改善工作站一(點焊站)和工作站三(冷卻站)。改善後的風輪製程，每日風輪產出數量由2個提升至4個，產能提升1倍和效率提升1.4倍，將製程達到最大經濟效益和高效率產出。

關鍵字

離心風機；翼型葉片；高效率；風輪製程

並列摘要

As ventilators are very extensively applied in various industries, centrifugal fan has a certain demand in the market. In addition, in recent years people have greater environmental awareness and support energy saving and carbon conservation, urging many fan manufacturers to look for ways to produce high performance and high efficiency fans, which shall become a trend in the industry in future. Attempting to replace the traditional plate blades by airfoil blades, the study uses CFD software and experimental design technique to look for parameters of high efficiency centrifugal fan. First of all, the paper uses full factorial experiment to analyze the parameters like installation angle, exit angle and chord length of NACA 8411 blade. The study finds that the airflow along geometric shape of airfoils is smoother than traditional plate blades. It is clearly shown from the increased total pressure efficiency, which rises from 75.2% of traditional plate blades to 78%, with an increase rate of total pressure efficiency at around 3%. Therefore, it is firmly believed that fans with airfoil blades tend to have high efficiency. Since there is a number of airfoil cross-section models in NACA series, the paper finds the vertical coordinate scale value, horizontal coordinate scale value and maximum thickness of NACA airfoil cross-section to conduct factorial experimental analysis of orthogonal array, and then makes slight adjustment to the key components of inlet cone and cover board of fan. As known from simulation results of airfoil centrifugal fan, the optimal rate of chord length of blade to outer diameter of wind turbine is 0.318, and the optimal ratio of maximum thickness to chord length of airfoil blade is 1:12.5. The study discovers that NACA 6508 airfoil blade have an optimal total pressure efficiency of model at 82.19%, with overall efficiency tremendously raised by 9.3%. After improvement, a fan can save around 4,900 degrees of electricity (electricity charge NT$14,000) and decrease carbon dioxide emission volume by 3.14 tons, achieving the goals of energy saving and carbon reduction. The study additionally assists a domestic famous fan manufacturer to improve the manufacturing process of the key component of wheels for centrifugal fan by selecting effort-saving way for manufacturing process of wheels. This process is divided into four workstations, and mainly offers improvement to workstation 1 (spot welding station) and workstation 3 (cooling station). After the wind turbine manufacturing process has been improved, the daily production volume of wind turbine increases from 2 to 4, production capacity increases by 1 time, and efficiency increases by 1.4 times, letting the process achieve the greatest economic benefit and high-efficiency output.

並列關鍵字

Centrifugal Fan, Airfoil ； High Efficiency ； Manufacturing of Wheels

參考文獻

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[14] 陳秉勣，離心風扇舌尖外型特性與噪音的影響，碩士論文，國立成功大學航太工程研究所，2003。

[17] 黃昭瑋，雙吸入後傾式離心風機數值與實驗整合研究，國立台北科技大學冷凍調工程系所，碩士論文，2006。

[22] 王政傑，後傾式離心風機之穩健最佳化設計，碩士論文，國立台北科技大學製造科技研究所，2012。

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翼型後傾式離心風機之設計參數分析與風輪製作省力化之研發

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