Introduction of DMD Method to Study the Dynamic Structures of a Three-Dimensional Centrifugal Compressor with and without Flow Control
Open Access
- 9 November 2018
- Vol. 11 (11), 3098
- https://doi.org/10.3390/en11113098
Abstract
The flow structures around the blade tip, mainly large-scale leakage vortex, exert a great influence on compressor performance. By applying unsteady jet control technology at the blade tip in this study, the performance of the compressor can be greatly improved. A numerical simulation is conducted to study the flow characteristics of a centrifugal compressor with and without a flow control. The complex flow structures cause great difficulties in the analysis of the dynamic behavior and flow control mechanism. Thus, we introduced a dynamic flow field analysis technology called dynamic mode decomposition (DMD). The global spectrums with different global energy norms and the coherent structures with different scales can be obtained through the DMD analysis of the three-dimensional controlled and uncontrolled compressors. The results show that the coherent structures are homogeneous in the controlled compressor. The leakage vortex is weakened, and its influence range of unsteady fluctuation is reduced in the controlled compressor. The effective flow control created uniform vortex structures and improved the overall order of the flow field in the compressor. This research provides a feasible direction for future flow control applications, such as transferring the energy of the dominant vortices to small-scale vortices.This publication has 15 references indexed in Scilit:
- Dynamic mode decomposition of turbulent cavity flows for self-sustained oscillationsInternational Journal of Heat and Fluid Flow, 2011
- Image processing analysis of vortex dynamics of lobed jets from three-dimensional diffusersFluid Dynamics Research, 2011
- Application of the dynamic mode decomposition to experimental dataExperiments in Fluids, 2011
- Dynamic mode decomposition of numerical and experimental dataJournal of Fluid Mechanics, 2010
- Spectral analysis of nonlinear flowsJournal of Fluid Mechanics, 2009
- Aerodynamics of a Transonic Centrifugal Compressor ImpellerJournal of Turbomachinery, 2003
- Rotating Instabilities in an Axial Compressor Originating From the Fluctuating Blade Tip VortexJournal of Turbomachinery, 2000
- Effect of blade tip configuration on tip clearance loss of a centrifugal impeller.TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1987
- Effects of Fluid Leakage on Performance of a Centrifugal CompressorJournal of Engineering for Power, 1979
- Small Turbomachinery Compressor and Fan AerodynamicsJournal of Engineering for Power, 1973