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題名 | 完全間歇噴流渦流動力模擬研究=Vortex Dynamic Simulation on the Fully Pulsed Jet |
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作者 | 許掙強; 江志煌; 易國安; Hsu, Cheng-chiang; Chiang, Chih-huang; Yih, Kuo-ann; |
期刊 | 航空技術學院學報 |
出版日期 | 20060800 |
卷期 | 5:1 民95.08 |
頁次 | 頁225-233 |
分類號 | 447.553 |
語文 | chi |
關鍵詞 | 平面噴流控制; 渦結構; 完全間歇噴流; 渦流動力模擬; Planar jet control; Vortex structure; Fully pulsed jet; Vortex simulation; |
中文摘要 | 本文提出一簡易之渦流模式,模擬探討間歇性噴流之流場演進,清晰的流場演進煙線軌跡圖在文中獲得。由本文之分析與研究,發現渦流的配對機制,為間歇性噴流向外擴展之主導機制,在此流場中,渦流結構的形成,經由捲起、配對、再配對持續進行,且其影響範圍隨著配對的次數增加,呈倍數增長。在配對進行過程中,可以發現可分為四個階段:(1) 第一個渦流形成、(2) 第二個渦流形成並被拉伸吸往下游渦流中心、(3) 上游的渦流捲起形成逐步趕上下游的渦流,而下游的渦流逐漸往外排開;(4)最後兩個渦流在同一個流向位置開始旋轉、捲起形成單一渦流。由下游處之統計平均量橫向分佈發現平均流速呈top-hat相似分佈,且半噴流寬度為橫向重要的特徵尺度。 |
英文摘要 | Vortex simulation technique is used to study the vortex dynamics of fully pulsed jet. In the present study, clear streak-lines are shown and time history of vortices paring, which is the dominant mechanism for fully pulsed jet expansion, are caught. The continuous pairing processes appear in the flow field. As the paring process completes the vortex structures become two times size and the region under vortex influence is also extended to two times. The process of vortices pairing could be divided into four characteristic stages: (1) the first vortex structure forms, (2) the second vortex structure appear in he upstream, (3) the upstream vortex structure is stretched and sucked into the first vortex structures in the downstream and the downstream vortex structure is introduced to move outside, (4) in the final stage, the downstream vortex and the upstream one merge together and rotate about the same center. The turbulent statistic properties in the cross stream direction are also obtained. In the analysis of turbulent statistic properties, we find the half jet width is the characteristic length scale in the transverse direction. |
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