Corner Separation Control by Boundary Layer Suction Applied to a Highly Loaded Axial Compressor Cascade
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In this paper, boundary layer suction (BLS) was used to control corner separation in a highly loaded compressor cascade and a total of five BLS slot configurations were studied and compared.Abstract:
Control of corner separation has attracted much interest due to its improvement of performance and energy utilization in turbomachinery. Numerical studies have been performed under both design and off-design flow conditions to investigate the effects of boundary layer suction (BLS) on corner separation in a highly loaded compressor cascade. Two new BLS slot configurations are proposed and a total of five suction slot configurations were studied and compared. Averaged static pressure rise, exit loss coefficient, passage blockage and flow turning angle have been given and compared systematically over a range of operation incidence angles. Distributions of significant loss removal, blade loading, exit deviation and total pressure loss at 3 degree and 7 degree incidence have also been studied. Under the same suction mass flows of 0.7% of the inlet mass flows, the pitchwise suction slot on the endwall shows a better optimal performance over the whole operation incidence among single suction slots. By using of the new proposed compound slot configuration with one spanwise slot on the blade suction side and one pitchwise slot on the endwall, the maximum reduction of total pressure loss at 7 degree incidence can be 39.4%.read more
Citations
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Turbulence characteristics in corner separation in a highly loaded linear compressor cascade
TL;DR: In this paper, the corner separation flow in a highly loaded prescribed velocity distribution (PVD) cascade has been studied by using DDES method based on SST k-ω model (DDES-SST).
Journal ArticleDOI
Investigation of Vortical Structures and Turbulence Characteristics in Corner Separation in a Linear Compressor Cascade Using DDES
Journal ArticleDOI
Numerical study of corner separation in a linear compressor cascade using various turbulence models
TL;DR: In this paper, a numerical study of corner separation in a linear highly loaded prescribed velocity distribution (PVD) compressor cascade has been investigated using seven frequently used turbulence models, including Spalart-Allmaras model, standard k- ǫ model, realizable k-ǫ-model, real-izable k -ǫ -ǔ model and standard k − ω model.
Journal ArticleDOI
Modified k-ω model using kinematic vorticity for corner separation in compressor cascades
TL;DR: In this paper, a new method of modifying the conventional k-ω turbulence model for corner separation is proposed, where the production term in the ω equation is modified using kinematic vorticity considering fluid rotation and deformation in complex geometric boundary conditions.
Journal ArticleDOI
Passive Separation Control with Blade-End Slots in a Highly Loaded Compressor Cascade
TL;DR: In this paper, a passive control method, blade-end slots, is implemented to reorganize the blade end flow in a highly loaded compressor cascade under a wide incidence range at Ma=0.59.
References
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TL;DR: In this paper, it was shown that the pressure Laplacian is positive within a low-pressure tube of small cross section enclosed by convex isobaric surfaces in a uniform density flow.
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TL;DR: In this article, a large, low-speed, aerodynamic model of a high-speed core compressor is designed and fabricated based on aerodynamic similarity principles, and the model is then tested at low speed where high-loss regions associated with three-dimensional endwall boundary layers flow separation, leakage, and secondary flows can be located, detailed measurements made, and loss mechanisms determined with much greater accuracy and much lower cost and risk than is possible in small, high speed compressors.
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Endwall Blockage in Axial Compressors
S. A. Khalid,A. S. Khalsa,Ian A. Waitz,Choon S. Tan,Edward M. Greitzer,Nicholas Cumpsty,John J. Adamczyk,Frank E. Marble +7 more
TL;DR: In this article, a new methodology for quantifying compressor endwall blockage and an approach, using this quantification, for defining the links between design parameters, flow conditions, and the growth of blockage due to tip clearance flow is presented.
Journal ArticleDOI
Control of Three-Dimensional Separations in Axial Compressors by Tailored Boundary Layer Suction
TL;DR: In this article, an appropriately applied boundary layer suction of up to 0.7% of inlet mass flow can control and eliminate typical compressor stator hub corner 3D separation over a range of operating incidence.