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Numerical simulation of thermo-fluid dynamic entropy generation in centrifugal compressors for micro-turbine application |
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| รหัสดีโอไอ | |
| Creator | K. Wasinarom, D. Boonchauy and J. Charoensuk |
| Title | Numerical simulation of thermo-fluid dynamic entropy generation in centrifugal compressors for micro-turbine application |
| Publisher | Thai Society of Mechanical Engineers |
| Publication Year | 2558 |
| Journal Title | Journal of Research and Applications in Mechanical Engineering |
| Journal Vol. | 3 |
| Journal No. | 2 |
| Page no. | 54-63 |
| Keyword | Entropy, flow passage, centrifugal compressor |
| ISSN | 2229-2152 |
| Abstract | This research proposed for investigation on the quantitative entropy generation in the streamwise location of flow passage of centrifugal compressors with different exit beta angle. The compressors operating condition was designed for small gas turbine application. The flow field was obtained by 3D numerical simulation technique (CFD), with the help of commercial CFD code. The analysis is coupled both of flow structure and quantitative entropy that is generated from the compressor inlet to the outlet. The comparison have been made between 10, 20, 30, 40 and 50 exit beta angle. The simulation result showed that at the streamwise location of 0.1-0.6, entropy generated around 60 J/kgK per streamwise location length for all exit beta angle, because inflow direction is parallel with the inlet impeller passage. In contrast to the location of 0.6-1.0, which entropy generated around 480 J/kgK per streamwise location length, around 8 times of the entropy generated in location 0.1-0.6. This is correspondent to high deformation rate of the flow field in this area. The separation and secondary flow can be observed as a result form blade tip flow leakage. Moreover, strong flow distortion resulting from switching the rotating reference frame to station reference frame, along with massive turbulent intensity that consequence in high local eddy viscosity. The beta angle was alleviated on jet-wake shear layer at the exit area of the compressor as a consequence of less entropy generation in the location of 0.6-1.0 streamwise location. |
