Atsumasa Yamamoto

Visualization of Temperature Distribution in a Linear Turbine Cascade with Cooling-air lnjection

To investigate mixing process with the main stream and behavior of the cooling-air in rotor cascade passages, an experiment was conducted with cooling-air ejection from blade leading-edges of the test cascade which was located downstream of another cascade simulating a stator cascade. In the present experiment, cooling-air was heated higher than the main stream temperature, and the temperature distribution of flow in the test cascade passage was measured in detail by a thermocouple. It was found that the behavior of the cooling-air ejected from the leading-edges were affected significantly by such as pressure gradients and passage vortices in the test cascade and by relative location between the upstream stator cascade and the downstream test rotor cascade.

QUANTITATIVE VISUALIZATION OF THREE-DIMENSIONAL FLOWS WITHIN TURBINE CASCADES

Three-dimensional flows and loss development mechanism occuring within three turbine cascades were quantitatively visualized at successive measuring planes upstream, within and downstream the cascades by using vectoral representation. The method was very useful for quick understanding of a great. amount of experimental data obtained in such the present study using automatic measuring system, and for revealing small effects which cannot be detected by the ordinary visualization technique.