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Performance Modeling Of Twin Shaft Gas Turbine as a Turbocomperessor

Mohajer Darabi, Abbas | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48107 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ghorbanian, Kaveh
  7. Abstract:
  8. Gas turbines and centrifugal compressors are the preferred means of compressing the gas in pipeline systems. Both gas turbines and centrifugal compressors exhibit performance characteristics that depend on the operating point imposed on them by the pipeline operation. Simulation of gas turbine-driven centrifugal compressors is necessary for a variety of applications in the general area of pipeline simulation. This research focuses on modeling of twin shaft gas turbine dynamic and steady state performance. For this purpose, it was necessary to evaluate the thermodynamic working process of the gas turbine by using an in-house computer code. At design point, the calculations are solely based on the thermodynamic laws of conservation of mass and energy. Introduction of the compressor and turbine maps are necessary to perform off-design computations though. The effects of blade cooling were also accounted for, in both design and off-design calculations by using of an improved stage-by-stage model. Gas turbine dynamic model is based on the inter component volume method and compressor dynamic model is developed based on the Gravdhal method. The results are then compared with the reliable literture refrence, in order to check the validity of the model. The aforementioned simulator is used instead of expensive tests, predicting gas turbine performance in various ambient and working conditions. Such simulator could also be used in condition monitoring systems, where the effects of degradation of engine components on the whole system performance are calculated. In contrary, feasibility of performance improvement due to different upgrade scenarios could be studied by performing sensitivity analysis
  9. Keywords:
  10. Modeling ; Performance ; Gas Turbines ; Centrifugal Compressor ; Dynamic Modeling ; Turbocompressor

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