Loading...

Aerodynamic Optimization of a Four Stage Centrifugal Flow Compressor

Mohammadi Yengejeh, Saba | 2018

463 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50923 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ghorbanian, Kaveh
  7. Abstract:
  8. The performance of centrifugal compressors deviates from its best design point and reaches lower efficiencies by time and conversion of input gas properties such as the pressure, temperature, and mixture characteristics. By the fact that each designed compressor should have a wide range of functionality, redesign and optimization processes take place. One of the challenging methods for improving the performance of centrifugal compressors is to modify aerodynamic passage of gas in impellers in order to achieve better pressure ratio and efficiency. The aims of the current study are to evaluate geometry properties of the blades of the first or the second impeller and even the whole compressor stages, in order to acquire optimized geometry characteristics of impellers at the design point condition.In this project, geometry developed by CFTurbo, BladeGen, and Design Modeler. In the meshing process, TurboGrid and ANSYS Meshing were utilized and for the 3dimensional analysis, CFX solver was used. Also, for optimization section, the DesignXplorer module of the ANSYS applied. The validation of numerical results evaluated by experimental performance results at the design point condition. The outcome of the optimization process was an increase of 7 % in pressure ratio and the polytrophic efficiency for impeller of stage one was increased by 2.21%. Also these values for impeller stage two were 15.2% and 6.55% respectively. At the end, the overall optimization of all two stages of the compressor results in 7.2% rise in pressure ratio and 8.6% rise in isentropic efficiency. In conclusion, this study suggests that the presented method has the capability to be a more feasible and less time-consuming alternative for the old try-and-error manufactural techniques. Nevertheless, a further study should be done to consider the effects of more geometrical factors such as, the blade height and the overall thickness of blades on the compressor’s performance
  9. Keywords:
  10. Centrifugal Compressor ; Optimization ; Pressure Ratio ; Polytropic Efficiency

 Digital Object List

 Bookmark