The measurements show that the anisotropy of turbulent flow in the duct is very strong and the locus of maximum mean velocity umax moves to the outer wall with the increase of angle θ after 25 ° .
实测发现湍流存在强烈的各向异性，最大时均速度u（max）在25°截面后随θ角增大向外壁移动。
umax