利用双参数非线性拟合求解湍流边界层壁面摩擦速度

Lianshan Lu, Dong Li

科研成果: 期刊稿件文章同行评审

1 引用 (Scopus)

摘要

Hot-wire anemometer is a fundamental tool for flow field measurement, and has been widely adopted in research of turbulent flow. A turbulent boundary layer was generated by a trip wire and a piece of sandpaper in the low-speed wind tunnel, and the time-averaged velocity profiles at three different streamwise stations in the boundary layer were measured with IFA-300 constant temperature anemometer. Targeting the dimensionless velocity profile model White Law of the turbulent boundary layer, a nonlinear curve fitting MATLAB program for two parameters, which were theoretical original point of wall coordinate y0 and wall friction velocity uτ, was developed. Based on the measured time-averaged velocity profiles, the program was adopted to determine y0 and uτ of the three streamwise stations. It is found that the initial search domain and search step size of y0 and uτ have no effect on the fitting results if the physical solutions are included in the domain. It is also found that the selected fitting velocities data are closely related to the results. The value of the friction velocity with high precision will be obtained by this nonlinear curve fitting method if the highest fitting velocity data point dose not fall into the wake region. The method given in this paper is simple in programming and reliable in fitting results, and it is of practical to obtain the wall friction velocity of the turbulent boundary layer.

投稿的翻译标题Determination of Wall Friction Velocity of the Turbulent Boundary Layer by Two-Parameter Nonlinear Curve Fitting
源语言繁体中文
页(从-至)253-260
页数8
期刊Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University
38
2
DOI
出版状态已出版 - 1 4月 2020

关键词

  • Dimensionless velocity profile
  • Hot-wire anemometer
  • MATLAB program
  • Nonlinear curve fitting
  • Turbulent boundary layer
  • Wall friction velocity
  • White Law

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