Abstract
The turbulent boundary layer flow has experimetally been studied under a steep favourable pressure gradient, whose maxmum value in non-dimentional form, K=ν/U12dU1/dx, is 8.8×10-6. The tubulent bulge in the outer layer keeps the similar shape in the statistical sense, suggesting that its turbulent structure maintains nearly the equilibrium condition, from which we can evaluate the change of turbulent characteristics along the line of constant intermittency. The turbulent intensity along the line decreases abruptly from a downstream location, and it coinsides with the starting point of relaminarization evalualed by various criteria proposed so far. Further downstream, both turbulent intensity and Reynolds stress decrease gradually, and especially the decrease of Reynolds stress seems to be due to the decrease of the number of the burst occurence. The turbulent production and dissipation also decrease in this flow region.
