| 摘要: |
| 采用RNG κ-ε模型和PISO算法，通过求解三维N-S方程，对腔体右侧振动膜片运动的二维合成射流流动与传热特征进行了数值模拟.模拟结果显示由于激励器在右侧振动膜片的作用下，合成射流产生的喷射气流在喷口中心右边速度稍大于左边速度，形成不对称射流流场；射流冲击壁面的速度峰值出现在中心区两侧，使得射流冲击换热的Nu数形成相应的峰值；随着合成射流冲击距离Z/do的增大，其对流换热系数出现先增大后减小的变化规律，当冲击距Z/do=20～30 mm时冷却效果较佳. |
| 关键词: 成射流 冲击冷却 传热 数值模拟 |
| DOI： |
| 分类号:TU452 |
| 基金项目:国家自然科学基金资助项目(11002161); 湖南省自然科学基金项目(13JJ9033); 全国优秀博士论文作者专项基金(201058); 高等学校博士学科点专项科研基金(20104307110007) |
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| Numerical study on flow and heat transfercharacteristics of Synthetic Jets |
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Xiang Liping, Xia Zhixun, Luo Zhenbin, Deng Xiong, Wang Lin
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College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073,China
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| Abstract: |
| Numerical simulation of a right-hand cavity moving law was performed through the solution 2D N-S equations and energy equation by using the PISO algorithm and RNG based κ-ε turbulence model. The simulation results reveal the airflow is asymmetry because the right airflow velocity of jet nozzle are more than the left airflow veloctity. The streamwise velocity off center peaks near the impinging surfaces, the Nusselt number off center peaks near the impinging surfaces. The Nusselt number take on up-down tendency as the nozzle-to-plate distance is increased. The cooling effect for Z/do=20～30 mm is more than the others. The Nu distribution along the wall is influenced mainly by the interaction of produced vortex ring and wall boundary layer. |
| Key words: synthetic jet impinging cooling heat transfer numerical simulation |
