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系統識別號 U0026-0812200913511507
論文名稱(中文) 導流板對不同角度集熱板之空氣動力特性研究
論文名稱(英文) A Study on Aerodynamic Characteristics of a Solar Water Heater under Various Inclined Angles and with a Guiding Plate
校院名稱 成功大學
系所名稱(中) 航空太空工程學系專班
系所名稱(英) Department of Aeronautics & Astronautics (on the job class)
學年度 95
學期 2
出版年 96
研究生(中文) 修治平
研究生(英文) Chip-Ping Hsiu
學號 p4793103
學位類別 碩士
語文別 中文
論文頁數 85頁
口試委員 指導教授-張克勤
指導教授-鍾光民
口試委員-李聰盛
中文關鍵字 鈍體空氣動力特性  升力  導流板  太陽能熱水器 
英文關鍵字 guiding-plate  solar-power heater  uplift  bluff aerodynamic characteristic 
學科別分類
中文摘要 能源是推動國家發展及經濟活動的基本要素。但由於台灣自產能源僅占能源供需總量之1.9%,所以太陽能熱水器加強使用壽命的研究與性能的提升,在環境保護以及經濟效益方面,均有極大的影響。但亦因台灣常受颱風的侵襲,且熱水器大多裝置於屋頂或頂樓,常因整體結構無法承受颱風的風力而受損。相較於以往對太陽能熱水器的研究,本研究針對結構部份承受氣流的空氣動力特性作探討。
在本研究中,以不同集熱板傾角安裝太陽能熱水器模型中,以及裝置不同尺寸導流板並配合不同安裝角度,為實驗分析之控制因素;利用水柱式壓力計以及荷重元測力系統為測量工具,針對其流場的空氣動力特性作一研究,試圖找出最佳解決方案。
經實驗發現,因集熱板角度改變,使得與風向垂直面之導流板投影面積改變,對於縱軸之空氣流場影響較大。角度降低使得與風向垂直面之投影面積降低,可以有效降低集水桶之鈍體空氣動力特性及尾渦之影響;反之,角度增加則使鈍體空氣動力特性及尾渦之影響增加。但對於橫軸之空氣流場則較無明顯影響。而導流板安裝角度為90°時,可有效降低鈍體空氣動力特性及尾渦所造成壓力變化影響,使縱軸上、下板表面壓力差減少,並使最大壓力差發生處向下方移動,此為加裝導流板之面積改變與其在風向垂直面之投影面積所致。
在三維升力部份,則亦有同樣情況產生,當集熱板角度提高時,所形成之升力亦隨之增加,且以各種角度互相比較後,增加的比例大約在0.9~1.9之間。而加裝導流板後,則以大尺寸導流板對流場結構影響較大,可以有效降低升力,其中以導流板安裝角度為90°時效果較佳。故降低集熱板角度並以90°角安裝大尺寸導流板對整體壓力變化及結構受力有最佳的效果。
英文摘要 The energy resource is a vital element of promoting national development and economic activity. However, according to energy supply and demand statistics, only 1.9% comes from Taiwan itself. Hence, the efforts about how to enhance the efficiency and life time of solar-powered heater are necessary. Moreover, the majority of solar-powered heaters often suffered severely because Taiwan often attacked by typhoons and most of the solar-powered heaters are installed in the roof or attic cause the construction to be unable to withstand the power of typhoon. Comparing the former studies of solar-powered heater, we aim to explore the aerodynamic characteristic.

Therefore, the controlling factors of this experiment are the flat panel under various inclined angles and the different guiding plates cooperate to various inclined angels. We used water column type pressure gauge and the load cell system as tools to research the aerodynamic characteristic of the flow field, and attempt to discover the best solution.

The experimental result shows that the projected area of wind direction perpendicular will change with the different angles of flat panel and has more influences on air flow-field of ordinate axis. Reducing the angle causes decreasing the projected area of wind direction perpendicular. It would reduce the aerodynamic characteristic of bluff body effectively, and the influence of wake. On the contrary, increasing the angle causes adding the projected area of wind direction perpendicular and the aerodynamic characteristic of bluff body as well as the influence of wake. But there is no obviously effect on air flow-field of abscissa axis. When the installed angle of guiding plate is α=90°can reduce the aerodynamic characteristic of bluff body and the influence of wake the most effectively. Beside, it also reduces the pressure differences between the upper and lower surfaces of the flat panel and causes the maximum pressure difference move to the down-stream. Therefore, to add the guiding plate and to change the angle of plate panel has the same result.

In the part of uplift-force, it also has the similar situation. When collection hot plate angle raised, the lift force also increased along with it, and the increases proportion approximately between 0.9~1.9. However, after installing the guiding plate, the big size guiding plate has the most influence to the structure of flow field. It can reduce the lift force effectively. The result shows the best effect is when the installed angle of guiding plate is 90°. Therefore, that the best effect to the entirely pressure variation and the structure stress is to reduce the angle of the flat panel and the installed angle is 90° with big size guiding plate.
論文目次 目 錄 I
表 目 錄 III
圖 目 錄 V
符號說明 VIII
第一章 緒論 1
1-1 前言 1
1-2 太陽能熱水系統 4
1-3 研究目的 5
第二章 實驗設備 8
2-1 太陽能熱水器模型 8
2-2 循環式低速風洞 9
2-3 實驗設備與儀器 10
2-4 問題研究 11
2-5 實驗步驟 13
第三章 結果與討論 18
3-1 改變集熱板安裝角度 18
3-2 加裝不同尺寸導流板 25
3-3 結果分析 29
第四章 結論與建議 31
4-1 結論 31
4-2 後續研究重點 33
參考文獻 35
自 述 85
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