| Title |
Experimental Study on Measuring the Intermittency in the Transitional Boundary Layer |
| Keywords |
Transitional boundary layer ; 천이경계층 ; Intermittency ; 간헐도 ; Flat plate flow ; 평판유동 ; Hot-wire anemometer ; 열선 유속계 ; Turbomachinery ; 유체기계 |
| Abstract |
An experimental study was performed to investigate the turbulence intermittency measuring methods across the boundary layer in the transition region. A single type hot-wire probe was used to measure instantaneous streamwise velocities in laminar, transitional and turbulent boundary layer. To estimate wall shear stresses on the flat plate, near wall mean velocities are applied to the principle of CPM. Distribution of intermittency factor is obtained by dual-slope method and compared to the results of four methods,,, TERA and M-TERA method. In these methods, M-TERA shows a good agreement in the near wall region. However, the result of M-TERA method shows that intermittency factor is underestimated in the outer part and outside of the boundary layer and the dimensional constant of M-TERA method should be changed appropriately depending on measuring point. |