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頁籤選單縮合
題 名 | 三維具橫向流之雙噴射垂直撞擊平板流場數值模擬=Numerical Simulation of the 3-D Flowfield of Normal Impinging Twin-Jet with Cross Flow |
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作 者 | 劉明山; 張中明; 莊書豪; | 書刊名 | 力學 |
卷 期 | 15:1 1999.06[民88.06] |
頁 次 | 頁35-44 |
分類號 | 447.55 |
關鍵詞 | 雙噴射; 撞擊流; 紊流; 橫向流; Twin-jet; Impinging jet; Turbulent flow; Cross flow; SIMPLEST; |
語 文 | 中文(Chinese) |
中文摘要 | 噴射撞擊流在航空工程的應用有垂直/短程起降飛機、火箭及熱噴射工業應用等, 雙噴射流撞擊平板後沿著平板產生向四周流動的壁流,兩壁流相撞則形成向上之噴泉流。包 圍噴射流與噴泉流附近的流體會被其帶入而在周圍形成數個渦流。上沖噴泉流可增加上平板 中央區之壓力,而渦流的結構與位置會影響上平板的壓力分佈,在噴流外側為低壓渦流,會 造成七平枝的升力損失,內側列為高壓渦流,能增加上平板的升力,而橫向流會造成上噴泉 流、渦流、壁流與停滯線等流場結構的改變,進而影響上平板之壓力分佈。本文採用 K- ε 紊流模式,使用控制體積積分之有限差分法及 SIMPLEST 計算程序,進行三維、恆溫、不可 壓縮、矩形雙噴射撞擊流場之數值模擬。分別就噴嘴距地面高度、噴嘴間距、噴嘴出口速度 、橫向流等,對噴射垂直撞擊平板流場的影響,逐一討論。 |
英文摘要 | The application of the jet impingement flowfield is wide, such as the vertical/short takeoff and landing (V/STOL) aircraft, rocket, and the heat jet industrial application. The twin jets impinge upon the plate and create radial wall jets. The two wall jets collide with each other and turn upward to form an upwash fountain which increases the lift force of the upper plate. The fluid surrounding the jets is entrained at the boundaries of the jets which results the induced circulating flows. At some situation, this secondary flow causes the upper plate to have a suck-down force phenomenon. The K-e two-equation turbulence model and the control-volume integration method and SIMPLEST algorithm were employed to simulate the three dimensional, isothermal, incompressible, rectangular two-impinging-jet on a flat plate. The effect of the height between nozzles and ground plate, the distance between the nozzles, the inlet velocity of the nozzles, and the velocity of the cross flow on the flowfield structure were studied one by one. |
本系統中英文摘要資訊取自各篇刊載內容。