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目前，国内外很多研究者正在研究一种新型的强化传热技术一纵向涡发生元强化传热技术。设计合理的纵向涡流发生元可以明显提高换热效果，也可起到流动减阻的效果，因此利用纵向涡发生器诱导涡来减薄或破坏流体边界层，是一种有效强化气侧换热的措施，不仅可以提高换热设备的效率、还可以减少设备的重量和体积，加工简单方便，符合节能技术的要求。因此，作为一种有效的被动式强化传热技术，纵向涡发生器正被越来越广泛地应用于各种强化换热领域。 本文通过数值模拟对一种新型组合矩形翼涡流发生器放置在矩形通道与波纹翅片通道的流动与换热特性进行了研究。对于矩形通道，研究了雷诺数为2000～16000的情况，分别对未放置纵向涡发生器、放置矩形翼及组合翼涡流发生器的情况进行研究，结果发现：组合翼比矩形翼具有更加的换热性能，当组合翼主翼攻角、辅翼攻角、辅翼到主翼前面的距离、辅翼到底面的距离、辅翼长度、辅翼高度变化时，通道的换热性能与综合换热性能表现了不同的特性。对于波纹翅片通道，研究了进口流速范围为0.8051m/s～4.0257m/s的情况，并对除在矩形通道中研究的组合翼各尺寸还包括主翼长度与主翼宽度在内的参数进行了分析，结果表明：这些参数对波纹翅片的换热与综合换热的影响情况有相似的，也有大不一样的。 观察通道中流体流动发展可以看出：流体在纵向涡发生器附近产生了多个漩涡，随流体沿流向发展多个涡旋逐渐移动、融合，最后形成一个大的逆时针漩涡。通过对比发现：组合翼比矩形翼产生的涡旋多、影响范围广、强度大；当涡流发生器附近的漩涡在通道左边成上下布置，且最后形成的大漩涡由左上向右下发展时，通道的综合性能较好；当涡流发生器附近的漩涡在通道左边成左右布置，且最后形成的大漩涡一直在通道中间位置时，通道的强化换热性能较好。 |
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爱与雨下(金币+3): 2011-11-28 12:06:32
sltmac(金币+50): 2011-12-11 20:50:15
sltmac(金币+50): 2011-12-11 20:50:19
sltmac(金币+20, 翻译EPI+1): 2011-12-11 20:50:24
爱与雨下(金币+3): 2011-11-28 12:06:32
sltmac(金币+50): 2011-12-11 20:50:15
sltmac(金币+50): 2011-12-11 20:50:19
sltmac(金币+20, 翻译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楼2011-11-28 10:10:30
taoyuanjing
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3楼2011-11-28 15:36:15