旋转状态边界层速度场及温度场特性实验

For the turbine rotor blade internal cooling technology, TR-PIV (time resolved particle image velocimetry) and hot wire technology were used to measure the velocity and temperature field of the boundary layer in the rotating channel under wall heating conditions. The results showed that when the rotation number was greater than 0.48, backflow occurred near the leading side, and an explanation was given from the force analysis. The backflow zone generally appeared downstream the flow field at a higher density ratio and a higher rotation number. The backflow effects can be used to achieve the purpose of enhancing the heat transfer of the leading side. The change laws of the dimensionless temperature profiles, temperature fluctuation and Nusselt number under different rotation conditions were obtained. The temperature field distribution inside the turbulent boundary layer produced a strong asymmetry under the rotation effect, generating a certain deviation compared with the standard law under static conditions.