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Optimization of A Centrifugal Compressor And Its Validataion With Exprimenatla And Numerical Results

Karrabi, Hadi | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40610 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy Benisi, Ali
  7. Abstract:
  8. The actual flow stream through compressor is 3D and fluctuated because of complicated geometry, fluid viscosity and high velocity. Therefore, more accurate analysis of this kind of flow, it is better to use 3D model. Nowadays the flow modeling software are able to model and analysis flow regime using numerical methods in three dimensions. Using these software allow us to find the ways which can reduce the energy losses to improve compressor efficiency.In current work, based on 3D numerical analysis, the flow regime in a centrifugal compressor is investigated and also the sensitivity of this analysis with mesh sizing is explored. The k-e type RNG model is used for modeling turbulent behavior of stream. For validating the model, experimental data based on result s from experiments in Sharif University Gas Turbine Laboratory are used. The results show consistency between model and experimental results. By Validating the model using experimental data, the next step is compressor optimization. Some ways for reducing energy lost are presented. Based on compressor geometry and modeling results, the main factor is the wall curvature between first and second stage diffusers. By modifying this curvature we can obtain 2 percent increase in efficiency
  9. Keywords:
  10. Three Dimensional Analysis ; Optimization ; Experimental Test ; Turbulence ; Compressor

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