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Experimental and Theoretical Investigation on Losses and One Dimensional Modeling of The Centrifugal Compressor

Doost Mohammadi, Ali Asghar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43839 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy Benisi, Ali
  7. Abstract:
  8. Centrifugal compressors have wide applications in the turbochargers, aircraft propulsion and petrochemical industry. Therefore it is important to design high efficiency centrifugal compressor. Knowledge of compressor performance at different conditions, energy losses and the contribution of each component of compressor in efficiency losses have of great importance.
    In this research, different loss models of the centrifugal compressor were reviewed and investigated. Then 1D codes were developed based on the loss models, and performance characteristics of S2B Schweitzer and GT4082 Garret compressors at different conditions were achieved. In order to evaluate the modeling results, turbocharger set up at turbocharger laboratory of Sharif University of Technology was equipped and calibrated. Then, a wide range experimental tests were carried out. One dimensional models results were verified using experimental results. The best combination of the loss models shows 3.6% difference in compare with the experimental results at design condition. A three dimensional simulation at design point speed of S2B Schweitzer compressor was performed and compared with experimental results, showing 1.5 % deviation.
    Furthermore, losses of Garret compressor components were measured by specific instrumentation with high detail. The results showed that the impeller losses are higher than stationary part losses in design and off-design conditions. Also, it is concluded that the impeller incidence losses are the main source of entropy generation at off-design conditions. Moreover, when compressor mass flow rate increases, the diffuser losses increases, while the volute losses decreases
  9. Keywords:
  10. One-Dimentional Modeling ; Centrifugal Compressor ; Loss Model ; Performance Characteristics ; Efficiency Loss

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