In English

The Impact of Surface Roughness on Transonic Compressor Performance

Sathyavanan Chinnaswamy
Göteborg : Chalmers tekniska högskola, 2015. Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8557; 2015:40, 2015.
[Examensarbete på avancerad nivå]

The increasing necessity for highly efficient engines and flow emission standards has steered the need for research into more efficient design and optimization of gas turbines. Surface roughness in the blades of compressors and turbines is one of the factors causing performance deterioration in gas turbines. This study involves the investigation of surface roughness effects on the performance of a research compressor stage through numerical simulations in a commercial CFD code, ANSYS CFX. An initial numerical study on a NACA airfoil was conducted with roughness and validated with the experimental data. It is followed by the implementation of uniform sand grain roughness over the rotor and stator blades of the compressor stage using the surface roughness model available in ANSYS CFX. Two different cases, one with roughness on the rotor and one with roughness on the stator and rotor combination were done. The results from the study shows the reduction in the main performance parameters such as pressure ratio, efficiency and mass flow in the compressor stage. The flow calculations shows an increase in blockage of the flow in the stage with an increase in surface roughness on the blades. Surface streamlines shows the influence of surface roughness on the separation over the suction side of the stator and the regions near the hub in the rotor.



Publikationen registrerades 2015-10-15. Den ändrades senast 2016-01-14

CPL ID: 224321

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