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題 名 | Simulation on Transition of Gas-Air Mixing Pattern in a Back-Ward-Step Flow with Lateral Wall Injection=背向階梯流模轉換間具壁面氣體--空氣混合效應之數值模擬 |
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作 者 | 李世昭; | 書刊名 | 永達學報 |
卷 期 | 6:2 民95.02 |
頁 次 | 頁103-113 |
分類號 | 440.137 |
關鍵詞 | 數值分析; 背向階梯流場; 氣體-空氣混合; 流場型態轉換; Numerical simulation; Backstep flow; Gas-air mixing; Flow pattern transition; |
語 文 | 英文(English) |
中文摘要 | 本文利用數值模擬的方式分析背向階梯後流場結構轉換機制,並證明所提近壁模式的正確性。壁面噴流與入口主流動量間的競爭致流場型態A至D依次浮現,即冷卻機制從蒸散轉變成薄膜型態。模擬所得之長時間平均結果極度符合實驗趨勢。文中亦檢視了壁面噴流對迴流區的暫態影響。這些結果提供了對此類流場中氣體-空氣混合機制的深入剖析。 |
英文摘要 | This numerical study not only focuses on switching mechanism of flow structures behind a backstep but also demonstrates the accuracy of the near-wall treatments adopted. Four distinct flow patterns result from the competing momenta between the wall injection and the inlet mainstream, which indicates a transition from transpiration to film cooling. The predicted time-averaged flow characteristics correspond well with the measurements. The effect of the sidewall injection on the instantaneous variation of the recirculation structure was also explored. |
本系統中英文摘要資訊取自各篇刊載內容。