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Aerodynamic Design of Axial Flow Turbine Stage

Soltaninejad, Mohammad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45750 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy-Benisi, Ali
  7. Abstract:
  8. Prediction techniques of axial flow turbine performance for different operating conditions are always developing due to high costs and lack of reliable empirical data. In axial gas turbines, fluid flow is three-dimensional, viscous, and highly turbulent. Nowadays, although flow field specifications are predicted accurately well using computational and numerical tools, the appropriate loss models are required for one-dimensional modeling and optimization in early design phases. In this research, an accurate and a complete investigation of aerodynamic losses in axial flow turbines will be discussed. Some suggested models for calculating losses in axial gas turbines, are considered and compared. Using these loss models, onedimensional modeling of axial flow turbine is performed and a turbine performance characteristics are predicted, which are evaluated using an axial flow turbine test results at gas turbine laboratory of Sharif University. For three dimensional simulation of the turbine performance, CFD software is employed.Using this software, the laboratory axial flow turbine domain is meshed and analyzed three dimensionally. Comparison the results of one-dimensional models and three-dimensional simulation show that one-dimensional models overestimate the energy losses. To evaluate the results of one-dimensional and threedimensional modeling, with experimental results, organized experiments are done on the gas turbine. Comparison between modeling results and experimental data shows that pressure ratio, and efficiency differences are less than 3% and 2% respectively which shows good agreement. Finally, one stage of axial turbine is designed using one-dimensional modeling based on main laboratory turbine specifications which yeilds, geometry details of the turbine blades. This program, calculates the geometric specification of the new stator and rotor and their performance characteristics. Some advantages are obtained such as %2 efficiency improvement of the new design. Thus, a relatively simple and useful technique in the design of axial gas turbine is developed
  9. Keywords:
  10. Efficiency ; Stator ; ROTOR ; Pressure Ratio ; Axial Flow Turbine ; Turbine Blades ; Losses

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