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目前，國內(nèi)外很多研究者正在研究一種新型的強化傳熱技術一縱向渦發(fā)生元強化傳熱技術。設計合理的縱向渦流發(fā)生元可以明顯提高換熱效果，也可起到流動減阻的效果，因此利用縱向渦發(fā)生器誘導渦來減薄或破壞流體邊界層，是一種有效強化氣側(cè)換熱的措施，不僅可以提高換熱設備的效率、還可以減少設備的重量和體積，加工簡單方便，符合節(jié)能技術的要求。因此，作為一種有效的被動式強化傳熱技術，縱向渦發(fā)生器正被越來越廣泛地應用于各種強化換熱領域。 本文通過數(shù)值模擬對一種新型組合矩形翼渦流發(fā)生器放置在矩形通道與波紋翅片通道的流動與換熱特性進行了研究。對于矩形通道，研究了雷諾數(shù)為2000～16000的情況，分別對未放置縱向渦發(fā)生器、放置矩形翼及組合翼渦流發(fā)生器的情況進行研究，結(jié)果發(fā)現(xiàn)：組合翼比矩形翼具有更加的換熱性能，當組合翼主翼攻角、輔翼攻角、輔翼到主翼前面的距離、輔翼到底面的距離、輔翼長度、輔翼高度變化時，通道的換熱性能與綜合換熱性能表現(xiàn)了不同的特性。對于波紋翅片通道，研究了進口流速范圍為0.8051m/s～4.0257m/s的情況，并對除在矩形通道中研究的組合翼各尺寸還包括主翼長度與主翼寬度在內(nèi)的參數(shù)進行了分析，結(jié)果表明：這些參數(shù)對波紋翅片的換熱與綜合換熱的影響情況有相似的，也有大不一樣的。 觀察通道中流體流動發(fā)展可以看出：流體在縱向渦發(fā)生器附近產(chǎn)生了多個漩渦，隨流體沿流向發(fā)展多個渦旋逐漸移動、融合，最后形成一個大的逆時針漩渦。通過對比發(fā)現(xiàn)：組合翼比矩形翼產(chǎn)生的渦旋多、影響范圍廣、強度大；當渦流發(fā)生器附近的漩渦在通道左邊成上下布置，且最后形成的大漩渦由左上向右下發(fā)展時，通道的綜合性能較好；當渦流發(fā)生器附近的漩渦在通道左邊成左右布置，且最后形成的大漩渦一直在通道中間位置時，通道的強化換熱性能較好。 |
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愛與雨下(金幣+3): 2011-11-28 12:06:32
sltmac(金幣+50): 2011-12-11 20:50:15
sltmac(金幣+50): 2011-12-11 20:50:19
sltmac(金幣+20, 翻譯EPI+1): 2011-12-11 20:50:24
愛與雨下(金幣+3): 2011-11-28 12:06:32
sltmac(金幣+50): 2011-12-11 20:50:15
sltmac(金幣+50): 2011-12-11 20:50:19
sltmac(金幣+20, 翻譯EPI+1): 2011-12-11 20:50:24
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At present, many domestic and foreign researchers are working on a new technology of heat transfer enhancement in a longitudinal vortex generating element of enhanced heat transfer technology. The rational design of longitudinal vortex generating element can obviously improve the heat transfer effect, can also play the flow drag reduction effect, so the use of longitudinal vortex generator vortex induced by thinning or disrupting the fluid boundary layer, is an effective gas side heat transfer enhancement measures, not only can improve the efficiency of heat exchanger, but also can reduce the weight of the equipment and volume, simple and convenient processing, accord with energy-saving technical requirements. Therefore, as an effective passive enhanced heat transfer technology, longitudinal vortex generators are being more and more widely used in all kinds of heat transfer enhancement field. In this paper, through the numerical simulation of a novel combined rectangular wing vortex generator is placed in a rectangular channel with a corrugated fin channel flow and heat transfer characteristics are studied. For a rectangular channel, on the Reynolds number is 2000 ~ 16000, respectively, without a longitudinal vortex generators, placed rectangular wing wing vortex generator and the combination of case studies, it was found: combined wing than rectangular wing has better heat transfer performance, when the combined wing wing angle of attack, attack angle, the main wing ailerons flaps to the front distance, the bottom of the ailerons, flaps, ailerons distance length height changes, heat transfer performance and heat transfer performance of different characteristics. The wavy channel, study of inlet velocity range is from 0.8051m / s to 4.0257m / s, and except in a rectangular channel in combination with various sizes of wing also includes the main wing length and width, the main parameters were analyzed, the results show that: the parameters of the corrugated fin heat exchanger and the heat transfer effect there are similar, there are different. Observation of channel in fluid flow can be seen: the fluid in the longitudinal vortex generators near has produced multiple vortex fluid along the flow direction, with the development of multiple scroll gradually move, fusion, finally forms a large counterclockwise whirlpool. By contrast: combined wing than rectangular wing produces scroll, affecting a wide range, high strength; when the vortex generator vortex in the channel near the left into upper and lower layout, and finally formed the maelstrom from left to right under development, channel better comprehensive properties; when the vortex generator vortex in the channel near the left about layout, and finally the formation of big eddy has been in the middle of the channel position, channel heat transfer enhancement performance good. |
2樓2011-11-28 10:10:30
taoyuanjing
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- 蟲號: 973157
- 注冊: 2010-03-16
- 性別: GG
- 專業(yè): 藥物分析
3樓2011-11-28 15:36:15
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