摘要
应用ＬＤＶ测试技术对垂直方管内三种不同栅距的网栅所形成的湍流流动做了详细测量，网栅栅距Ｍ分别为１４ｍｍ、１０ｍｍ、６ｍｍ。实验给出了管内不同位置湍流流动的各种参数沿流动方向的衰减规律，并就三种网栅进行比较分析，以探讨这种网栅流动所具有的共同规律和在不同栅距时湍流结构及脉动大小的不同特点，从而对这种网栅所形成的湍流流动结构有了较为清晰的了解。
In this paper, detailed Laser Doppler Velocimeter (LDV) measurements of the grid generated turbulent flows in a vertical square duct in the case of various mesh size are reported. The decay characteristic curves of the turbulent intensity and turbulent energy in the streamwise direction at various position in the duct are presented. Compared in different aspects on the experimental results in the case of various mesh size, analyses and discussion for the common laws in the grid flows and the different characteristics of the turbulence structure and the fluctuation strength in the case of various mesh size are also presented. On the basis of the data acquired, more detailed and distinct understanding of the grid generated turbulent flows can be obtained.
出处
《应用力学学报》
CAS
CSCD
北大核心
1999年第2期27-31,共5页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金
