Experimental Study on Flutter in Cascading Blades : 1st Report, Measurement of the Aerodynamic Damping Force Acting on Cascading Blades Vibrating in Translatory Mode

Abstract

For the purpose of investigating the aerodynamic damping effects on vibrating cascade blades, the authors made a water tunnel with a linear cascade in which five blades vibrate in a translatory mode with arbitrary frequency and phase angle between the adjacent blades. A series of experiments were carried out on an isolated blade and on the cascades with the following conditions : Blades : NACA 65-(12) 10 (fixed : 8, vibrating : 5) chord : 30 mm span : 60 mm solidity : 1 stagger angle : 0°, 30° amplitude of vibration : 2 mm The experimental results were analyzed by comparing with the theoretical ones hitherto obtained and with the aid of the considerations about the quasi-steady force of vibrating blades.