Abstract
The effects of transient thermal stresses and steady-state gas bending loads on the vibration of a rotating, pretwisted compressor blade and the effect of thermal stresses on the vibration of a rotating compressor disk were studied. The transient thermal stresses arise from a rapid engine acceleration from an idle to a full-throttle speed, and the gas bending loads exist as a result of the pressure ratio across the rotor stage. It was found that the untwist angle of a typical rotating blade under both thermal stresses and gas bending loads is changed significantly. The maximum total transient thermal stress effect, including the thermal restoring torque and thermal twist deformation, reduced the torsional rigidity of the last-stage blade by 4.9%. The total gas bending effect, taking into account the static twist deformation and bending-torsion coupling, may change the blade frequencies by - 0.8-1.6%. The thermal stresses within a disk heated around its outer radius tend to increase the disk rigidity for a nodal diam n 1. The change of the disk frequencies of typical compressor disks is from -1.2-0.2%.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call