Application of the Proper Orthogonal Decomposition Method in Analyzing Active Separation Control With Periodic Vibration Wall
-
Jin-Chun Wang
,
Guo-Ping Huang
Abstract
The proper orthogonal decomposition (POD) method is employed to analyze the unsteady flow control mechanism because it is a good approach to decouple the spatial and temporal structures of unsteady flow fields. The results showed that the main effect of the periodic excitation is reallocating the energy of each mode, and selectively strengthening or weakening certain modes. Under proper amplitude and frequency of periodic excitation, the energy in higher modes will be transferred to the first mode and the translation of the modal energy is coming from the reconstructing of spatial flow structures and the ordering of modal evolution characteristics. The best control effect will be achieved when the total energy ratio of the first mode is the highest and the excitation frequency reaches the separation vortex frequency at the same time. In order to quantitatively analyze the order degree of the unsteady flow field, the maximum Lyapunov exponent was introduced. The results showed that with the energy in higher modes transferred to the lower modes, the flow field transfers from a disordered pattern to an ordered one.
Funding statement: This work was supported by the National Science Foundation for Young Scientists of China (51306089) and National Science Foundation of China (51176072).
Acknowledgments
The authors wish to express their gratitude to Jiangsu Province Key Laboratory of Aerospace Power System (affiliated to College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics) for technical support.
Nomenclature
non-dimensional frequency
strouhal number
total pressure
total energy ratio
eigenvalue
- f0
separation vortex frequency
- fvir
vibration frequency
non-dimensional vibration amplitude
- L
characteristic scale
- A
vibration amplitude
- m
mach number
total pressure loss coefficient
velocity
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Artikel in diesem Heft
- Frontmatter
- Editorial
- Jet-Engines Revised Dictionary for the 6th-Generation-R&D in a New Era
- Original Research Articles
- Off-Design Analysis of Transonic Bypass Fan Systems Using Streamline Curvature Through-Flow Method
- Predicting Lean Blowout and Emissions of Aircraft Engine Combustion Chamber Based on CRN
- Dielectric Barrier Discharge (DBD) Plasma Actuators for Flow Control in Turbine Engines: Simulation of Flight Conditions in the Laboratory by Density Matching
- Application of the Proper Orthogonal Decomposition Method in Analyzing Active Separation Control With Periodic Vibration Wall
- Model Predictive Control and Controller Parameter Optimisation of Combustion Instabilities
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Artikel in diesem Heft
- Frontmatter
- Editorial
- Jet-Engines Revised Dictionary for the 6th-Generation-R&D in a New Era
- Original Research Articles
- Off-Design Analysis of Transonic Bypass Fan Systems Using Streamline Curvature Through-Flow Method
- Predicting Lean Blowout and Emissions of Aircraft Engine Combustion Chamber Based on CRN
- Dielectric Barrier Discharge (DBD) Plasma Actuators for Flow Control in Turbine Engines: Simulation of Flight Conditions in the Laboratory by Density Matching
- Application of the Proper Orthogonal Decomposition Method in Analyzing Active Separation Control With Periodic Vibration Wall
- Model Predictive Control and Controller Parameter Optimisation of Combustion Instabilities
- Quasi-One-Dimensional Modeling and Analysis of RBCC Dual-Mode Scramjet Engine
- Investigation on the Performance of Forward Bending Fan
