Visualization of Secondary Instability Flows Generated between Görtler Vortices (Continued Paper)

The forced wavelengths of Gortler vortices are easily given by the leading edge plates with varying the period of a saw-tooth edge, and the variation of the forced wavelengths makes transformation of secondary instability flows. The experiments with concave channel of 1 m radius of the curvature for main airflow velocity of 2.5m/s were performed using the leading edge plates. Variation in secondary instability flows was tested by smoke visualization and hot-wire measurement, and was examined from viewpoints of maximum disturbance amplitude Kmax. It was confirmed that meandering flows whose (Kmax)max varies linearly with the non-dimensional forced wavelength parameter Λ prevail at 100