1987 年 53 巻 486 号 p. 450-458
The cross-sectional average velocity, Um, of a pulsatile flow fluctuates with the Womersley number of 45.2. The ratio of the amplitude of Um to its time mean value, U^-m, is 0.366 and the Dean-number, based on U^-m, is 1.58×104. The results obtained are as follows : (1) The axial velocity componet, Uφ, fluctuates synchronously with Um. The amplitude of Uφ is smaller than that estimated from a quasi-steady state assumption based on Um at the outer wall region and is larger at the inner wall region. At the inner wall region the amplitude of secondary flow velocity component, Ur, becomes about two times larger than the estimated one using Um : (2) In the large part of the skewed boundary layer on the end wall, non-dimensionalized secondary flow velocity decreases exponentially with distance from the end wall, although the distribution in steady flow has wall jet type similarity.