# 臺灣博碩士論文加值系統

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 本文利用流體力學理論，以數值方法模擬研究輥輪流平機制與氣冷式機車引擎熱液動之性能分析。流平分析分別模擬1.牛頓流體（n=1）和非牛頓流體(μ=f(r))；2.非牛頓流體(μ= f(r))在不同表面張力σ下(0.014 N/m、0.028 N/m與0.056N/m)；3.非牛頓流體(power law)在不同n值(1.2、1.0、0.8)的情況下，各參數對流平時間影響。結果發現牛頓流體（n=1）比非牛頓流體的(μ=f(r))流平時間還長，兩者的半衰期時間為0.55ms、0.39ms；改變表面張力σ為0.014、0.028與0.056 N/m時，我們可以得到半衰期時間為0.76、0.39與0.19 ms。得到當表面張力減小時，流平時間會增加；不同n值的情況下，可以看到當n值分別為1.2、1.0、0.8下，其所需之半衰期時間為1.7、0.55、0.1 ms。得到當n值增加，流平時間也增加。跟不同的n值作比較，我們所使用的非牛頓流體(μ=f(r))是一個n<1的擬塑性流體，根據它的半衰期時間可以看出它是一個0.8
 This thesis utilized fluid dynamics theory to study the thermal-hydraulic analysis of roller leveling and air-cooling motorcycle engine.In leveling, we use 1. different fluid (Newton fluid(μ=cons.) and non-Newton fluid(μ=f(r)) )；2. different surface tension (0.014、0.028 and 0.056 N/m)；3. non-Newton fluid for different power-law index n (1.2、1.0、0.8). In the numerical results ,we could find that when Newton fluid、lower surface tension and higher power-law index n were applied, the time needed for leveling was longer .We also find the non-Newton fluid (μ=f (r)) is a pseudoplastic fluid (n<1),the power-law index n is within 0.8 to 1.0.In the study, the three different fan speeds (4500rpm、9000rpm、18000rpm) were used to investigate the heat transfer coefficient for the air-cooling motorcycle engine. For fan speed w=4500rpm、9000rpm and 18000rpm, the averaged velocity is 9.3m/s,18.9m/s and 38.1m/s, respectively, while the flow rate is 6.9m3/min, 14.0m3/min, 28.4m3/min, respectively. The averaged temperature on the cylinder is 700C, 620C, 560C, respectively; the pressure drop is 250Pa, 1000Pa, 5000Pa, respectively. The maximum heat transfer coefficient was occurred on the windward; the minimal heat transfer coefficient is on the leeward. It is also shown that the heat transfer coefficient h varies with V 0.68. Regression analysis was conducted to obtain h=0.209*w^0.691 , which can be applied for 4500
 摘要……………………………………………………………………Ⅰ英文摘要………………………………………………………………Ⅱ致謝……………………………………………………………………Ⅲ目錄……………………………………………………………………Ⅳ表目錄…………………………………………………………………Ⅴ圖目錄…………………………………………………………………Ⅵ符號說明………………………………………………………………Ⅷ第一章 緒論…………………………………………………………1第二章 理論分析…………………………………………....………15第三章 數值方法………………………………..……………………27第四章 實驗設備與方法…………………………………………….42第五章 結果與討論…………………………………………..………46第六章 結論……………………………………………………..75參考文獻………………………………………………………………78自述……………………………………………………………….……82
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