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題 名 | 切型渦漩層流入口效應之近場實驗研究=Experimental Investigations of Inlet-Effects on the Near-Fifld of Laminar Swirling Flow |
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作 者 | 王宏邦; 王安杰; | 書刊名 | 力學 |
卷 期 | 13:2 1997.06[民86.06] |
頁 次 | 頁185-195 |
分類號 | 440.137 |
關鍵詞 | 渦漩層流; 入口效應; 近場流場; 雷射都卜勒測速儀; Laminar swirling flow; Inlet conditions; Near-field structure; LDA; |
語 文 | 中文(Chinese) |
中文摘要 | 渦漩流近場由於其複雜之三維結構,是文獻中所最缺乏但卻又關係整個下游流場 發展最重要的部份。 本文利用流場顯影與 LDA 定量量測相互配合,以研究渦漩層流於不同 入口渦漩分佈作用下對渦漩近場結構之效應,同時並探討奇數非對稱切向入口分佈之影響。 實驗之切向雷諾數範圍為 97 至 2,100。本文中發現:縱使在各種不同入口分佈之渦漩流場 中, 流場之近場結構皆可分為三個主要特性區域:(1) 上游中心圓錐區 (2) 中心迥流區及 (3) 外環區。不同之渦漩分佈所造成的差異主要在包括中心迥流區之前的部份。在中心迥流 區之後或在較高速之渦漩流,流場對渦漩入口分佈以及切向渦漩數之敏感性則降低。另外, 吾人也發現:縱使在不同的切向雷諾數及不同的渦漩入口分佈下,若選擇適當的無因次化特 徵長度及特徵速度,渦漩流近場結構無論在軸向及切向均具有相當程度之相似性。而從非對 稱入口效應之探討中,吾人發現其對渦漩流近場大區域結構之影響不大,以及渦漩噴流數對 流場區域大結構影響之可加成性。 |
英文摘要 | The main purpose of this paper is to investigate the flow structure in the near field of a laminar swirling flow caused by different arrangements of injection of tangential jet(s) into a circular pipe. The flows were studied for the Reynolds number from 97 to 2,100. Based on results of flow-visualizations and the LDA-measurements, the near-field flow structure for all cases studied in this paper could be devided into three different characteristic zones: they are (a) upstream central zone, (b) central recirculation zone and (c) outer annular zone. Although the flows, caused by asymmetric injection of tangential jets, showed a three-dimensional velocity distributions in the near flow-field before the end of central recirculation zone, however, it revealed a flow structure which is insensitive to inlet-condition and is nearly rotationally symmetric in the downstream regions. Increasing Reynolds numbers could shorten the asymmetric regions. By adequate choosing the characteristic velocity and length scales, the large flow structure was found to have the similarity character for different Reynolds numbers and different inlet conditions. |
本系統中英文摘要資訊取自各篇刊載內容。