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Comparative study of turbulent boundary layer wall friction velocity measured by average velocity profile method

WANG Kang-jun;BAI Jian-xia;TANG Zhan-qi;JIANG Nan;School of Mechanical Engineering,Tianjin University;Renai College of Tianjin University;Tianjin Key Laboratory of Modern Engineering Mechanics;  
Based on average velocity profile of plate turbulent boundary layer with different Reynolds numbers,the wall friction velocity was calculated by using the viscous bottom layer fitting algorithm,the logarithmic law region fitting algorithm and Spalding formula fitting algorithm,respectively,and the average velocity profile was non-dimensionalized.By comparing the dimensionless average velocity profile with the theoretical curve,the validity of above three fitting methods was verified.Then the wall friction velocity error obtained by above three fitting algorithms was compared with that measured directly by oil film interference method,and the internal mechanism of the error formation of different fitting algorithms was analyzed.The accuracy and reliability of above three fitting algorithms were verified.Results show that the accuracy and reliability of Spalding fitting algorithm are better than the other two fitting algorithms.
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