Effect of Intake Acoustic Reflection on Blade Vibration Characteristics
Abstract
:1. Introduction
2. Aerodynamic Model
3. Acoustic Cut-On Frequency
4. Numerical Setup
5. Flow Structures
6. Acoustic Flutter Analysis
6.1. Flow Field Acoustic Properties
6.2. Relationship between the Pressure Waves and Flow Structure
6.3. Acoustic Reflection Analyses
6.4. Unsteady Pressure Propagation Characteristics on Blade Surfaces
6.5. Blade Aeroelastic Stability
7. Conclusions
- The position of the shockwave is determined by the phase of the reflected acoustic waves, and the change in the shock wave position is the primary cause of the change in the blade aeroelastic stability under the influence of acoustic wave reflections. When wave reflection occurs upstream of the fan, the outgoing acoustic waves interfere with the reflected waves, resulting in a band-shaped axial distribution of the acoustic pressure. Different phases of the reflected waves represent varying magnitudes of the interfered acoustic pressure in front of the fan, consequently causing chordwise position variations in the shock wave and altering the blade aeroelastic stability.
- The effect of reflected waves on the local aeroelastic stability of blade surfaces varies in different zones dominated by different flow structures influencing the propagation of pressure waves. The amplitude variation of the pressure waves varies in the areas affected by the tip leakage flow and radial flow migration. This explains why the aerodynamic work on the suction surface always slightly deviates from the sinusoidal pattern.
- In prior studies, there has been a lack of attention directed toward investigating the influence of intake acoustic reflections on flow structures in the vicinity of blades. This study revealed that the influence of acoustic wave reflection on blade aeroelasticity cannot be dissociated from that of flow structures. Due to the interference of acoustic waves in the intake, the pressure in front of the fan changes, eventually leading to a shift in the position of the shock wave.
- The above findings imply that acoustic wave reflection plays an important role in the aeroelastic stability of the blade by affecting the flow structures. Thus, the intake geometry should be carefully selected. In our study, acoustic–vortex coupling is observed, but its effects on the blade aeroelastic stability are not discussed. Further study on this topic should help to clarify the physical mechanism of acoustic flutter.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameter | Unit | Value |
---|---|---|
Number of Blades | - | 22 |
Tip Clearance | mm | 1.016 |
Design Rotational Speed | rpm | 16,043 |
Inlet Tip Diameter | cm | 51.4 |
Outlet Tip Diameter | cm | 48.5 |
Hub/Tip Radius Ratio at Leading Edge | - | 0.375 |
Hub/Tip Radius Ratio at Trailing Edge | - | 0.478 |
Mesh Level | Total Mesh Point | Mass Flow Rate | Pressure Ratio | Efficiency |
---|---|---|---|---|
Coarse | 752,763 | 34.1037 | 1.588 | 0.8976 |
Medium | 1,207,325 | 34.0588 | 1.592 | 0.8996 |
Fine | 1,565,434 | 34.0206 | 1.591 | 0.8991 |
Elasticity Modulus (GPa) | Poisson Ratio | Density (kg/m3) |
---|---|---|
110 | 0.33 | 4400 |
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Yang, H.; Liang, H.; Zheng, Y. Effect of Intake Acoustic Reflection on Blade Vibration Characteristics. Aerospace 2024, 11, 358. https://doi.org/10.3390/aerospace11050358
Yang H, Liang H, Zheng Y. Effect of Intake Acoustic Reflection on Blade Vibration Characteristics. Aerospace. 2024; 11(5):358. https://doi.org/10.3390/aerospace11050358
Chicago/Turabian StyleYang, Hui, Hui Liang, and Yun Zheng. 2024. "Effect of Intake Acoustic Reflection on Blade Vibration Characteristics" Aerospace 11, no. 5: 358. https://doi.org/10.3390/aerospace11050358