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題名 | 背向階梯後具壁面低溫噴流之高溫暫態分離流場觀測研究=Transient Flow Visualization of High-Temperature Separated Flow with Cold Wall Injection |
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作者 | 馬萬鈞; 顧景德; 楊鏡堂; | 書刊名 | 火藥技術 |
卷期 | 13:2 1997.09[民86.09] |
頁次 | 頁13-21 |
分類號 | 440.137 |
關鍵詞 | 背向階梯; 暫態程序; 高溫; 流場觀測; Backward facing step; Transient process; High-temperature; Flow visualization; |
語文 | 中文(Chinese) |
中文摘要 | 本文以流場觀測法研究具低溫壁面噴流之背向階梯後高溫分離流場暫態變化,試 圖模擬固體燃料軸向突張衝壓燃燒室在燃料熱解至引燃前之流場結構變化,以瞭解燃料引燃 前在燃燒室內之分佈情形,研究結果顯示:在低溫壁面噴流所引致之暫態流場中,首先受到影 響者為角落渦旋與主迴流渦旋,接著角落渦旋擴張,擠壓主迴流渦旋,最後低溫流體進入剪 流層與高溫主流場混合。同時流場暫態行為之發展受雷諾數之影響,雷諾數之增加將抑制低 溫流體向上穿越之快慢。 |
英文摘要 | The transient structure of separated flow field after a backward facing step with high-temperature inlet flow and uniform low-temperature wall injection was observed and experimentally investigated. The Reynolds number based on the step height ranged between 4731 and 9085. A three-beam, two-component laser-Doppler anemometer and a shadowgraphy system were used. It was concluded that once the low-temperature fluid was injected, the main eddy altered their shapes and sizes first, then the size of the corner eddy expanded suddenly, and the low-temperature fluid finally penetrated into shear layer and mixed with the hot main stream. The time lag of corner eddy expansion depended upon the inlet Reynolds number. The increase of the Reynolds number delayed both the expansion of the corner eddy and the mixing across the shear layer. |
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