Abstract
Purpose
This paper investigates experimentally the aerodynamic performance and forced response characteristics of two rotors (baseline and optimized design) under the influence of frequency mistuning effects.
Method
The optimized rotor blade was obtained by a multidisciplinary optimization framework, in which the aerodynamic performance and vibration characteristics were improved numerically. From steady-state aerodynamic measurements, the total pressure ratios at different operating conditions of the baseline and optimized blade were measured and validated. The optimized blade demonstrated a 0.5% improvement in total pressure ratio and a consistent shift of the performance curve towards higher mass flow rates. Ten modified cylinders were uniformly installed circumferentially in front of the rotor to serve as the excitation source, so the forced response of both baseline and optimized blade during the acceleration process was observed and measured by using the blade tip-timing technique.
Results
Blade tip-timing data analysis revealed that the rotor blades exhibited relatively strong responses at engine order (EO) 10 and 12, which was caused by the coupling effect of the upstream cylinder and downstream outlet stator. A detailed analysis and evaluation were required because they were found to be close to the design speed. Compared with the baseline blade, the maximum vibration amplitude decreased by 7.3% for EO = 10, and the amplitude magnification factor reduced from 1.56 to 1.47, approximately 5.7%. Similarly, for EO = 12, the maximum amplitude and amplitude magnification factor of optimized blade also decreased by 18% and 3.5% respectively. Furthermore, an improved fundamental mistuning model (FMM) was employed to predict the vibration amplitudes of all blades. The average predicted vibration amplitudes exhibited good agreement with the measured values in the deterministic analysis. Especially for the case of EO = 12, the relative error of the averaged amplitude was less than 1%. However, accurately predicting the maximum amplitude remains challenging due to the complex structural and aerodynamic coupling. The maximum relative error exceeded 16%.
Conclusion
Even so, both experimental and numerical results indicated that the amplitude magnification factor of optimized blade was smaller than that of the baseline.


























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Data availability
No datasets were generated or analysed during this study.
Abbreviations
- AMM:
-
Asymptotic mistuning model
- BTT:
-
Blade tip-timing
- CFD:
-
Computational fluid dynamics
- LE:
-
Leading edge
- TE:
-
Trailing edge
- EO:
-
Engine order
- HCF:
-
High cycle fatigue
- HB:
-
Harmonic balance
- FMM:
-
Fundamental mistuning model
- MP:
-
Measurement plane
- ND:
-
Nodal diameter
- OPR :
-
Once per revolution
- \({K}_{G}\) :
-
The correction coefficient of inlet boundary layer
- \({T}_{0}\) :
-
The environmental temperature
- \({P}_{0}\) :
-
The environmental pressure
- \({P}_{BS}\) :
-
The static pressure of inlet wall surface
- \(G\) :
-
The inlet mass flow rate
- \({\varphi }_{G}\) :
-
The flow coefficient
- \({\psi }_{P}\) :
-
The total pressure coefficient
- \(\pi \) :
-
Total Pressure ratio
- \({d}_{i,j}\) :
-
The blade displacement of blade i measured by probe j
- \(\mu \) :
-
The mean of Gaussian distribution of forced response
- \(\sigma \) :
-
The standard deviation of Gaussian distribution of forced response
- \(\omega \) :
-
The excitation frequency
- \([{\Lambda }^{^\circ }]\) :
-
Modal stiffness matrix
- \(\mathbf{D}\) :
-
Complex modal displacements expressed in physical coordinates
- \(\left[\text{E}\right]\) :
-
The discrete Fourier transformation matrix
- \({\mathbf{F}}_{\text{external}}\) :
-
The modal force vector due to external excitations
- \({\mathbf{F}}_{\text{vibration}}\) :
-
The modal force vector due to blade vibration
- \([\text{I}]\) :
-
Modal mass matrix
- \([\Delta \text{K}]\) :
-
Stiffness matrix perturbation due to mistuning
- \([\Delta \text{M}]\) :
-
Mass matrix perturbation due to mistuning
- \(\mathbf{Y}\) :
-
Complex modal displacements expressed in traveling wave coordinates
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Acknowledgements
The first author would like to thank Shanghai Jiao Tong University for supporting this research in blade tip-timing measurement.
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Fan, C., Wu, Y., Adjei, R.A. et al. Experimental Investigation on Forced Response of Mistuned Axial Compressor Rotors. J. Vib. Eng. Technol. 13, 75 (2025). https://doi.org/10.1007/s42417-024-01633-4
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DOI: https://doi.org/10.1007/s42417-024-01633-4