Study of Design and Manufacturing of Vane of Diffuser for Centrifugal Compressor

Ravosh, Farshad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47558 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy Benisi, Ali
  7. Abstract:
  8. The purpose of this research is providing the preliminary study and designing, fabricating and installing diffuser vanes on the vaneless diffuser compressor to improve its overall performance. To meet the goal, the GT4082 turbocharger centrifugal compressor is chosen as the basis unit. The compressor is fully modeled, to predict the compressor performance curves. One dimensional and three dimensional models are provided, to simulate the compressor with vaneless diffuser as well as vaned diffuser. In one dimensional model, governing equations are continuity, energy, and state and also the empirical components losses coefficients of the compressor are used. In this method, fluid properties are assumed constant in cross sections perpendicular to the main stream direction. Having inlet conditions for each element of compressor, exit conditions are calculated. For detailed results modelling, three dimensional model is employed and compressor flow field as well as performance are predicted. Boundary condition are set to specify total pressure and total temperature at inlet and mass flow rate at the outlet. In order to assess the results of modellings, wide range experimental tests are carried out at Sharif University turbocharger laboratory on the vanless compressor. For this purpose, the tests are carried out in five rotational speeds, 40000, 50000, 60000, 70000 and 75000 rpm. For each speed, several tests are performance at different mass flow rates. Then, the outcomes from modeling are compared with experimental results, which shows good argument. Then, diffuser vanes are designed, and new compressor performance is predicted which results desired improvement in compare with existing characteristics. Therefore, vanes are fabricated and installed on the compressor. Finally, several tests are carried out on the compressor with new structure. Comparing the results of tests in two case shows that, overally in design speed, pressure ratio and efficiency increase they by 2.3 and 2.1 percent respectly. Furthermore, the experimental results are applied to verify the new compressor modelling, to predict its performance in wide range of operation
  9. Keywords:
  10. One-Dimentional Modeling ; Compressor ; Centrifuges ; Centrifugal Compressor ; Vanless Diffuser ; Vaned Diffuser

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