摘要
采用任意拉格朗日-欧拉(Arbitrary Lagrangian-Eulerian,ALE)方法,研究低雷诺数下内置倒转簧片通道的流动与传热,模拟不同抗弯刚性系数下倒转簧片的振动现象、流场特性及其对通道传热的影响。结果表明:随抗弯刚性系数的增大,倒转簧片在均匀来流中存在偏转模式、大幅度拍打模式、小幅度拍打模式和稳定模式4种运动模式;与普通通道相比,大幅度拍打模式下,通道壁温降低,平均努塞尔数显著提高;小幅度拍打模式下,通道壁温有较小程度的降低,平均努塞尔数有一定提高;稳定模式下,簧片对流场扰动极小,通道壁温与普通通道几乎相同,平均努塞尔数基本不变;偏转模式下,由于簧片始终偏向通道下侧,阻塞了通道下侧的流动,通道壁温显著升高,平均努塞尔数显著降低;在实际工程应用中,应避免使倒转簧片处于偏转模式和稳定模式下,尽量使其处于大幅度拍打模式下,才能有效强化通道内传热。
Using Arbitrary Lagrangian-Eulerian(ALE) method, the flow and heat transfer in the heated channel of low Reynolds number with an inverted reed internally installed were studied, so as to simulate the reed vibration, flow field characteristics and their combined effects on the heat transfer in the channel under different bending stiffness coefficients. Results show that with the increase of bending stiffness coefficient, there are in total following four motion modes of the inverted reed found in the channel with uniform inflow: deflection mode, large-scale flapping mode, small-scale flapping mode and stable mode. Compared with typical channels, the wall temperature of the channel with oscillating reed reduces and the average Nusselt number increases significantly, under the large-scale flapping mode;the wall temperature decreases and the average Nusselt number increases slightly, under the small-scale flapping mode. Whereas, under the stable mode, the disturbance of the reed is very small on the flow field, and the wall temperature and the average Nusselt number are almost the same as the typical channels;in the deflection mode, because the reed always deviates to the lower side of the channel, the flow in the downstream is easy to be blocked, when the wall temperature increases significantly, and the average Nusselt number drops a lot. Therefore, to enhance the heat transfer in heated channels, the inverted reed should be installed in the large-scale flapping mode, but not in the deflection mode or stable mode, in actual engineering applications.
作者
江鑫宇
杨茉
JIANG Xinyu;YANG Mo(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2020年第4期317-322,329,共7页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51736007)。
关键词
流固耦合
倒转簧片
强化传热
fluid-solid coupling
inverted reed
heat transfer enhancement
作者简介
江鑫宇(1995-),男,江苏南通人,硕士研究生,主要从事流固耦合及强化传热方面的研究;通信作者:杨茉,男,教授,博士,电话(Tel.):13024171865,E-mail:yangm@usst.edu.cn。
