The present research examines the impact of isolated blade oscillations on the turbulent flow structure in a linear blade cascade. The study was carried out at a Reynolds number of 2.3 × 10⁵ with blade vibrations induced at 73 Hz. Additionally, the experimental program includes two incident angles (-3°, +6°) and three blade motion modes: stationary, bending oscillations, and torsional oscillations. The resulting turbulence behavior was analyzed using hot-wire anemometry. The findings highlight the dominant role of incident angle and bending vibration in wake formation and turbulence dynamics. At lower blade inclinations, the bending significantly reduces wake depth and enhances large-scale vortex formation. Compared to the stationary blades, the integral length scale increases 7.5 times under bending and 2.2 times under torsional vibrations, emphasizing the bending-induced motion as a primary contributor to the formation of large energy-containing turbulent structures. Notably, Kolmogorov microscales in the wake remain nearly constant at approximately 30 μm, regardless of the experimental conditions.
Yanovych et al. (Fri,) studied this question.