逆压力梯度湍动边界层近壁面湍流结构双立体PIV研究

2011/02/20   下载量： 7 次

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One of the fascinating phenomena of natural science which has gripped the attention of many scientists is the problem of turbulence. Besides the ubiquitous variety and beauty of turbulent phenomena, the inherent fascination and attraction are strongly connected with the enormous difficulties associated to its physical and mathematical understanding. As a general solution is out of reach, the properties of different idealized flows with simple geometries are being examined experimentally and numerically. Since its discovery by Prandtl, the boundary layer has been a subject of growing interest and is still an active subject of research. Due to both its fundamental and technical interest, the fully developed turbulent boundary layer in a nominally zero pressure gradient (ZPG) has been examined extensively. A flow of equal importance and perhaps more widely observed in practice is the turbulent boundary layer (TBL) in the presence of an adverse pressure gradient (APG). This flow has not received the same attention as the ZPG TBL due to its increased complexity and the necessity of firstly understanding the ZPG situation.

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