Modeling of a Turbocharger Turbine to Predict Its Performance and Investigating the Possibility of Improvement using Experimental Results

Meary, Mohammad Hosein | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56367 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy Benisi, Ali
  7. Abstract:
  8. Radial inflow gas turbines are widely used in auxiliary power units, small industrial gas turbines and turbocharger of internal combustion engines. They have advantage for low mass flow rate and wide range operation conditions. This research aimed to improve aerodynamic performance of the radial turbine of GT4082 Garret turbocharger. First, performance characteristics of the turbine were obtained experimentally at Turbocharger Laboratory of Sharif University of Technology. Laboratory results are the basis for modeling evaluation. Then, a one-dimensional model was developed to predict the turbine performance characteristics. The model results were compared with experimental results, that showed a maximum efficiency difference of 3%. Therefore, the modeling has good accuracy and it can be used to predict the behavior of the improved turbine. Three-dimensional model was also implemented and validated for performance prediction and obtaining the details of the turbine flow field. In comparing the three-dimensional modeling results with the experimental results, a maximum difference of 1.2% in efficiency was observed. Therefore, this model predicts the behavior of the turbine with good accuracy. Then, both of the models were applied for parametric design study of the turbine wheel. The dimensions of the turbine wheel were constrained by the casing geometry. Therefore, a new design was obtained and investigated. The improved turbine design increases the turbine efficiency by 4% and the range of high efficiency working by 40%
  9. Keywords:
  10. Turbochargers ; Performance Characteristics ; Experimental Results ; One-Dimensional Model ; Three Dimensional Model ; Improve Aerodynamic Performance ; Turbine Modeling

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