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| 題 名 | Sulfur Effects on Gasoline's Deposit Formation Mechanism and Evaporation Lifetime of Droplet on Metal Surface=汽油中硫成分對金屬壁面積污生成機構與液滴蒸發壽命曲線之影響 |
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| 作 者 | 林永嵩; | 書刊名 | 樹德學報 |
| 卷 期 | 19 1997.03[民86.03] |
| 頁 次 | 頁1-33 |
| 分類號 | 446.44 |
| 關鍵詞 | 進汽閥積污; 積污生成模擬裝置; 液滴蒸發壽命曲線; 高速攝影技術; 氧化硫成分; Intake-valve deposit; Deposit simulator; Droplet lifetime curve; High speed photography; Oxygenated compounds; |
| 語 文 | 英文(English) |
| 中文摘要 | 噴射供油式引擎(port-fuel-injected engine)的汽油噴霧液滴造成進汽閥(或汽 道)積污問題嚴重負面影響引擎性能與廢氣污染問題。本文建立一實驗室尺度積污生成模擬 裝置,研究探討汽油組成硫成分與汽油液滴在壁面上之蒸發模式對積污生成機構之影響。其 主要原理在評估汽油液滴於油滴產生器控制下,滴落在均溫不�袗�熱平面上之積污生成現象 ,以高速攝影技術觀察液滴蒸發生成積污模式,定量的探討汽油含硫量對液滴蒸發壽命曲線 與積污生成機構之影響。本模擬裝置生成之積污薄膜用 FTIR 紅外線吸收光譜法、TGA 熱重 量分析法和光學顯微照像等分析其組成。結果得獲汽油積污含有高比例的氧化硫成分,汽油 中微量的硫足使液滴蒸發壽命曲線偏移,造成積污量有明顯增加的趨勢。在同汽油成份狀態 下, 該積污質量及溫度之關係曲線與油品之壽命曲線成反比例成長關係, 在壁溫 Tn ( Nukiyama temperature )時汽油液滴蒸發與氧化劇烈,積污量可得一極大值。 |
| 英文摘要 | The intake-valve deposits of gasoline engines can impair engine perfor -mance and exhaust emission. Deposit formation in the induction system of port-fuel-injected engines depend on the fuel compositions and fuel-droplet/metal-surface interaction. In this study, a laboratory-scale deposit simulator was developed and it produced deposit film by impinging gasoline droplet from droplet generator onto a heated stainless plate. A high speed photogra-phy was used to image the evaporation characteristic of droplets on a heated surface. The effcets of sulfur component in the gasoline on deposit formation and evaporation lifetime of droplet were investigated quantitatively. Various analytical techniques FTIR (fourier transformation infrared spectroscopy), TGA (thermal gravimetry analysis) and Microscopy were utilized to characterize the deposit film composition. The result of experiments indicated that the amount of deposit formed is inversely proportional to lifetime of the gasoline droplet for the same fuel. Sulfur in gasoline shifts the evaporation lifetime curve and causes fuel droplet lifetime shorter relatively to increase the tendency of deposition. FTIR and TGA analysis suggested that sulfur in the deposits was primarily in the form of oxygenated compounds. The maximum amount of deposit weight were obtained at Nukiyama temperature (at which the droplet has a minimum lifetime). |
本系統中英文摘要資訊取自各篇刊載內容。