Study of high temperature thermal boundary conditions on active surfaces of the cylinder shaped ultrasonic transducers

Results of an experimental and numerical research of two-dimensional unsteady flow around the butt end of the model of cylinder shaped ultrasonic transducer at zero angle attack are presented. The flow formed employing linear dc plasma torch, is turbulent with Re number between 1.8 × 10^4 and 2.2 × 10^4 and temperature -1200 K. At this regime the flows boundary layers at the cylinder edge separate laminar and transition takes place in the free shear layers. In the shear layer strong vortex shedding and temperature fluctuations are observed. Experimentally estimated distribution of velocities and temperatures on the flat surface of circular cylinder compared with the predicted and has been established good agreement under the results. The influence of the location to distribution and quantity of dynamic and thermal parameters was investigated.