Influence of rotation and pretwist on cantilever fan blade flutterThe fundamental and lowest frequency natural modes in a cantilever fan blade exhibit significant amounts of flexure and torsion coupled by pretwist and operation in a rotational force field. Consequently the flutter estimation of such blades requires an accurate structural description that incorporates these two effects, amongst others. A beam-type finite element model is used in this study with up to six spanwise elements, each element being pretwisted. Coalescence-type flutter is found with subsonic aerodynamics. Evidence of the aerodynamic resonance phenomenon is exhibited and the importance of including radially varying aerodynamic forces is brought out.
Document ID
19860026948
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sisto, F. (Stevens Inst. of Tech. Hoboken, NJ, United States)
Chang, A. T. (Stevens Institute of Technology Hoboken, NJ, United States)