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This study investigates aeroelastic couplings in a linear blade cascade consisting of five NACA 0010 blades, each elastically suspended and restricted to a single rotational degree of freedom. The blades are equipped with an electromagnetic excitation system that delivers short pulse excitations. A moment pulse applied to an individual blade displaces it from its neutral position and induces vibrations. These vibrations propagate through the cascade due to aeroelastic couplings, resulting in either vibration damping or, in specific cases, vibration amplification due to aeroelastic instability - flutter. Experimental investigations have been carried out to understand the transmission of vibration through aeroelastic couplings and to identify the conditions that lead to flutter. The results presented in this thesis include controlled flutter experiments describing blade cascade stability, and uncontrolled flutter experiments induced by pulse excitation. The main result is the evaluation of flutter initiation, which includes blade amplitudes, frequencies and inter-blade phase angles.

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Pulse Excitation of Linear Blade Cascade Blades: Experimental Investigation of Aeroelastic Couplings

  • 会议论文

  • 发表日期：

    2026年

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  • Pavel Šnábl,
  • Luděk Pešek,
  • Pavel Procházka,
  • Chandra Shekhar Prasad

摘要

This study investigates aeroelastic couplings in a linear blade cascade consisting of five NACA 0010 blades, each elastically suspended and restricted to a single rotational degree of freedom. The blades are equipped with an electromagnetic excitation system that delivers short pulse excitations. A moment pulse applied to an individual blade displaces it from its neutral position and induces vibrations. These vibrations propagate through the cascade due to aeroelastic couplings, resulting in either vibration damping or, in specific cases, vibration amplification due to aeroelastic instability - flutter. Experimental investigations have been carried out to understand the transmission of vibration through aeroelastic couplings and to identify the conditions that lead to flutter. The results presented in this thesis include controlled flutter experiments describing blade cascade stability, and uncontrolled flutter experiments induced by pulse excitation. The main result is the evaluation of flutter initiation, which includes blade amplitudes, frequencies and inter-blade phase angles.