瑞利-伯纳德热湍流中的多湍流态现象  

Multiple flow states in turbulent Rayleigh-Bénard convection

作　　者：陈鑫[1,2] 郗恒东 CHEN Xin;XI Hengdong(Shanghai Institute of Applied Mathematics and Mechanics,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China;School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;Institute of Extreme Mechanics,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]上海大学力学与工程科学学院,上海市应用数学和力学研究所,上海200072 [2]西北工业大学航空学院,西安710072 [3]西北工业大学极端力学研究院,西安710072

出　　处：《空气动力学学报》2022年第2期147-155,146,I0003,共11页Acta Aerodynamica Sinica

基　　金：中国博士后科学基金(2021M702077);国家自然科学基金(12125204,11772259)。

摘　　要：热湍流现象是自然界以及生产生活中很普遍的现象,它源于温差导致的密度差引起的自然对流。瑞利-伯纳德(Rayleigh-Bénard,RB)热湍流系统是从众多自然现象、工程实际中抽象出来的研究热湍流的经典流体力学模型系统。在过去的几十年间,瑞利-伯纳德热湍流系统被广泛用来研究湍流热输运、流动结构演化等特性。最近的研究发现即使在相同的控制参数下,RB热湍流系统中的大尺度流动存在不同的湍流态(结构),且不同的湍流态对应着不同的热输运效率。因此,理解不同的湍流态(结构)的产生机制有助于调控系统的热输运效率。本文就RB热湍流系统中的多湍流态现象,着重评述近年来的若干研究新进展,并对今后的研究工作进行展望。Thermal turbulence is ubiquitous in nature and industry, which is a kind of convection driven by density difference due to the temperature gradient. Turbulent Rayleigh-Bénard (RB) convection is a basic research paradigm subtracting from the actual complicate problems. In the past decades, RB convection had been widely used to study the turbulent heat transport, flow structure evolution and other fundamental mechanisms.Recently, it is found that under the same control parameters, the RB convection exhibits different turbulent flow states (structures) and there is a one-to-one correspondence between the turbulent flow states and heat transport efficiencies. Thus, uncovering the mechanism of the emergence of different turbulent flow states (structures) is beneficial to control the heat transport efficiency of RB convection. In this paper, we focus on the multiple flow states phenomena in turbulent RB convection and review recent progresses. We also point out the issues and challenges and give an outlook on the future research.

关 键 词：热湍流 湍流统计 流动结构 多湍流态 湍流输运 

分 类 号：O357.5[理学—流体力学]