文档介绍：中国工程热物理学会传热传质学
学术会议论文编号:123559
带离散肋旋转盘表面对流换热的数值研究
朱兴丹,张靖周,谭晓茗
南京航空航天大学能源与动力学院,南京210016
(Tel:********** E-mail:zhuxindan19890109@)
摘要:通过数值方法研究了旋转速度和表面肋化结构对于旋转盘表面温度分布和对流换热性能的影响。随着旋转速度的提高,泵吸射流对转盘中心的冲击作用增强,同时在转盘外缘发生层流向湍流的转捩,对流换热得到强化;肋片的存在导致旋转盘泵吸效应削弱,同时也强化了转盘表面气旋流动的扰动,总体效果具有强化对流换热的作用;在相同的肋片扩展面积下,针肋的对流换热强化能力高于离散环形肋。
关键词:旋转盘;离散肋;对流传热;数值模拟
Numerical Study of Convective Heat Transfer on a Rotating Disk Surface with Discrete Pins
ZHU Xing-dan, ZHANG Jing-zhou, TAN Xiao-ming
(College of Energy and Power Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
Abstract: Numerical study on the flow and heat transfer characteristics over a rotating disk was performed to investigate the effects of rotating angular speed and pin configuration on the temperature maps and convective heat transfer characteristics on rotating surface. As the increase of rotatioal speed, the impingement of pumping jet on the centre of rotating disk became stronger and the transition from lamilar to turbulent occurred at the outer radius of rotating disk, which resulted in heat transfer enhancement. The pins on the disk made the pumping action of a rotating disk weaker. Simultaneously, they also acted as tubulators to the cyclone flow near the rotating disk surface, which made the overall heat transfer to be enhanced. Under the same extend areas of pins, needle pin has h