By U.S. Department of Transportation
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Additional resources for Airframe and Powerplant Mechanics Airframe Handbook
The recent work by Panovsky and Kielb, proposing a design method to prevent LP turbine blade ﬂutter [Panovsky and Kielb, 2000], is a well-known attempt in this direction. This method (P-K method) is based on the ﬁnding that ﬂutter stability of a turbine blade vibration mode is not only depending on the mode frequency and blade aerodynamic operating condition, but also on the blade modeshape. The ﬂutter stability is still assessed by comparing the actual to critical reduced frequency, making the new method easily applicable.
Vibration Amplitude Distribution Inﬂuence 25 A comparison of Figures 3 to 5 shows the effect of a vibration amplitude ratio between the edge and internal blades of the sector on the aerodynamic stability of the sectored vane. A change in the vibration amplitude distribution from the uniform to the internal blades dominant stabilizes the sectored vane. While choosing the vibration amplitude with the edge airfoils dominant decreases the stability (Figs. 4a-c). 05 becomes smaller. While near the aft part of the reference vane suction surface the maximum of the critical reduced frequency values increases.
11. Thus, also for bending-dominated modes the similarity between the main stability and instability directions for the four-, ﬁve- and six-airfoil sectored vanes are observed. The differences in the level of aerodynamic damping are deﬁned by the number of the airfoils in the corresponding sectored vane. As expected, increasing the number of airfoils in sector from four to six increases the aerodynamic stability of the cascade. 6. Conclusions A model for performing a stability analysis towards a reduced frequency and sector mode shape variation has been applied to a low-pressure turbine sectored vane.