頁籤選單縮合
題名 | 以渦流法模擬兩相噴流之粒子運動=Numerical Simulation of Gas-Particle Two-Phase Single Jets by Vortex Method |
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作者 | 許掙強; 梁家智; 林怡劭; 洪振益; | 書刊名 | 航空太空及民航學刊. 系列B |
卷期 | 39:1 2007.04[民96.04] |
頁次 | 頁15-23 |
分類號 | 447.553 |
關鍵詞 | 兩相流; 平面噴流; 渦流法; Two-phase; Single jet; Vortex method; |
語文 | 中文(Chinese) |
中文摘要 | 本研究係利用渦流法來模擬單一噴口之平面噴流流場,並於噴流出口分別加入不同粒徑的粒子,藉由模擬結果發現小粒子較能跟著流場渦流結構運動,粒徑越小越能流至渦流中心;大粒子卻只能在渦流較外圍處運動;而當粒子大至一定程度,粒子運動甚至會直接穿過渦流結構,不受渦流結構之影響。若從流場速度曲線與粒子分佈曲線來看,對小粒子而言,在噴流場的初始區內,主要受到x方向速度之影響,故甚至能從粒子分佈曲線觀察到類似流場勢流錐的分佈;但在勢流錐以後的區域,則易受y方向速度與紊流效應之影響,其粒子分佈與x方向速度曲線不太契合。但對大粒子而言,y方向速度與紊流效應相較於其慣性太小,故影響大粒子分佈主要還是x方向之速度。 |
英文摘要 | Gas-particle two-phase single jet is simulated by the vortex method to investigate the relation between particles and large-scale coherent structure. The results of numerical simulation displayed that the motion of small particle is closely connected to large-scale vortex dynamics. And, we could found small particles could be entrained into the central region of coherent structures. But large particles only appeared around the suburb of coherent structures. However, in the initial region the dispersion of small particles matches very good with the profile of x-directional velocity. After the end of potential core, the dispersion is influenced by y-directional velocity and fluctuation so the dispersions do not correspond with the profile of x-directional velocity. For large particles, the effects of y-directional velocity and fluctuation on particle motions are small. So, dispersion still matches very good with the profile of x-directional velocity in the downstream and obtains similarity distributions. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。