面流、戽流的床面压力脉动特性  

Characteristics of Pressure Fluctuation in Combined Flow with Surface and Submerged Jets

作　　者：张志军[1] 

机构地区：[1]河海大学环境工程系

出　　处：《河海大学学报（自然科学版）》1989年第1期101-108,共8页Journal of Hohai University(Natural Sciences)

摘　　要：本文介绍了作者关于面流、戽流床面压力脉动特性试验研究的主要成果。通过对260个点脉动压力数据的分析证明,将面流与戽流床面压力脉动数据视为正态分布是符合实际的。本文还给出了半极差系数K值的取值范围,并讨论了脉动压力系数Cp′沿床面的分布规律以及各主要流态下床面脉动压力的频谱特性。试验结果表明,流态对半极差系数K的取值、脉动压力系数沿床面分布规律以及脉动压力的频谱特性均有显著的影响。This paper deals with some basic characteristics of pressure fluctuations on bed beneath combined flow with surface jet and submerged jet.The results obtained show that the experimental data of pressure fluctuations in the flow accord with Gaussian distribution.The paper gives the value of the coefficient K of half-extrema difference of amplitude of pressure fluctuations in different flow patterns,and discusses the features of the distribution of pressure fluctuation coefficient C_p′ on bed and the charac- teristics of frequency spectra.In addition,the study also shows that flow patterns have a remarkable influence on the value of coefficient K and the distribution of the coefficient C_p′ of fluctuation pressure and the frequency spectrum of fluctuation pressure.

关 键 词：面流 戽流 脉动压力 半极差 

分 类 号：TV135.22[水利工程—水力学及河流动力学]