旋转光滑直通道湍流流动一维热线实验

In order to obtain the velocity models of turbulent boundary layer and mainstream in rotating smooth straight channels at different Reynolds numbers and higher rotation numbers, a correction formula for the logarithmic law of rotation channels with a wider range of rotation numbers was constructed, the hot wire was used to measures the average velocity and wall friction velocity at four different flow locations in a rotating smooth straight channel. The Reynolds number and rotation number respectively ranged from 15000-25000 and 0-0.444, the wall of the channel was at room temperature and there was no heat exchange between the fluid and the wall. Results showed that rotation had a great influence on the velocity of channel section. The rotation led to the overall deflection of the velocity model to trailing side, but the highest speed occurred in the area near the leading side; the dimensionless averaged velocity model near the trailing side was strictly arranged in the order of rotation number, and logarithmic law was distributed in the logarithmic law area. At the same time, wall shear stress monotonously decreased with the increase of the number of rotations at the leading side, and the trend of the change at the trailing side was contrary to this. The slope of the logarithmic law formula modified by rotation decreased monotonously with the increase of rotation number and decreased gradually at the trailing side. The rotation correction formula of the logarithmic law area was put forward,and the error of the formula was controlled within 15%.