Abstract
We report on experimental investigations of the evolution of a harmonic point-source disturbance in a laminar flat-plate boundary layer. The experiments were performed in a laminar water-channel designed for low-speed transition experiments. Small initial disturbances were introduced at a point source by periodic excitation with a single frequency. This type of artificial disturbance contains a broad spectrum of spanwise wave number modes, which are amplified or damped depending on the local stability characteristics. Detailed hot-film measurements in the linear regime of disturbance development show a wedge-like downstream evolution of the resulting wave train. A subharmonic-type breakdown process of the wave train with the characteristic pattern of staggered A-shaped vortices was observed by using flow visualization with hydrogen-bubbles and laser-sheet illumination.
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