平面射流沿轴线的特征尺度及其对测量信号过滤程度的依赖

CORC > 北京大学 > 工学院

	平面射流沿轴线的特征尺度及其对测量信号过滤程度的依赖; Centerline characteristic scales of a turbulent plane jet and their dependence on filtration of measured signals
	米建春 ; 冯宝平
刊名	物理学报
	2010
关键词	信号过滤平面射流湍流尺度 signal filtering plane jet turbulence scales
英文摘要	对出口雷诺数约为13000的湍流平面射流瞬时速度(u)测量信号(u_m)进行高频过滤研究.在分析了高频噪声对u测量精度的影响后,使用Mi等人(2005,Phys.Rev.E71,066304)提出的快速收敛迭代法对u_m进行了数值过滤,并考察过滤前后统计湍流量的变化.; This study has two main objectives: (1) to examine the availability of a filtering scheme developed by Mi et al (2005, Phys. Rev. E 71, 066304) on the measured velocity signal and (2) to investigate the centerline characteristic scales of a plane jet with the exit Reynolds number of Re = 13188. The success of the filtering scheme has been well validated. It is found that the existence of the high-frequency noise impairs not only the small-scale properties of turbulence but also those associated with large-scale turbulence. After filtering the noise, while the dissipation rate of turbulence kinetic energy is correctly obtained, the characteristic scales of turbulent flow (i. e. the Kohnogorov and Taylor turbulence micro-scales and the integral scale) are appropriately estimated. The results reveal that the centerline characteristic scales of the plane jet exhibit a linear dependence on the downstream distance (x) at <=. 20 h, where h is the height of the nozzle. It is interesting to note that the statistical properties of small-scale turbulence appear to enter their self-preserving state earlier than those of large-scale turbulence in the jet. To our knowledge, this finding has not been reported in the literature.; 国家自然科学基金; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000280168700053&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 4; 7; 4748-4755; 59
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/14651]
专题	工学院
推荐引用方式 GB/T 7714	米建春,冯宝平. 平面射流沿轴线的特征尺度及其对测量信号过滤程度的依赖, Centerline characteristic scales of a turbulent plane jet and their dependence on filtration of measured signals[J]. 物理学报,2010.
APA	米建春,&冯宝平.(2010).平面射流沿轴线的特征尺度及其对测量信号过滤程度的依赖.物理学报.
MLA	米建春,et al."平面射流沿轴线的特征尺度及其对测量信号过滤程度的依赖".物理学报 (2010).