Abstract
The paper studies the effect of neighboring blade rows on unsteady aerodynamic force due to blade vibration and on flutter characteristics of cascading blades. For this purpose the computation program to calculate the unsteady blade loading based on the unsteady lifting surface theory for contra-rotating annular cascades was formulated and coded. Numerical examples of unsteady aerodynamic works for various combinations of cascades, i.e., subsonic-subsonic, supersonicsupersonic, and subsonic-supersonic cascades, are presented. It is clearly shown that the difference in the unsteady aerodynamic work on vibrating blades between the case of the decoupled cascade and the case of the aerodynamically coupled cascades is large when the neighbor cascade is supersonic. A computation program to solve the coupled bending-torsion flutter equation for the contra-rotating annular cascades was also developed. Some results of the flutter analysis are presented. The presence of the neighboring blade row gives rise to significant change in the critical flutter fluid velocity for the subsonic cascade when the main acoustic duct mode is of cut-on state.
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References
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Namba, M., Nanba, K. (2006). UNSTEADY AERODYNAMIC WORK ON OSCILLATING ANNULAR CASCADES IN COUNTER ROTATION. In: Hall, K.C., Kielb, R.E., Thomas, J.P. (eds) UNSTEADY AERODYNAMICS, AEROACOUSTICS AND AEROELASTICITY OF TURBOMACHINES. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4605-7_14
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DOI: https://doi.org/10.1007/1-4020-4605-7_14
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