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Two-Stage Axial Compressor Design Software

Peyvan, Ahmad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45486 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilou Benisi, Ali
  7. Abstract:
  8. Axial-flow compressor is one of the most basic components of gas turbine engines. Consequently, it is essential to design this machine appropriately. Full three dimensional analyses of axial-flow compressors is time consuming due to the flow field complexity, so a method with minimum running time and producing an acceptable design is required. One dimensional design method is a low cost procedure with acceptable results for preliminary stages of design. It receives inlet flow conditions, such as total pressure ratio, mass flow and rotational speed and designs a compressor which satisfies the desired input data. Too many efforts have been accomplished to predict energy losses, design incidence angle, design deviation angle and stall condition. They are theoretical-experimental researches. In present work, the models of Lieblein, Koch-Smith, Herrig, Johnsen-Bullock, Horlock, Pollard-Gostelow, Aungier and Reneau are implemented to predict the compressor losses, incidence angle, deviation angle, stall and surge conditions.First, the performance of a single stage axial-flow compressor is predicted using one-dimensional modeling approach. Then the results are validated with experimental and three-dimensional modeling results. Maximum differences of one-dimensional modeling results and experimental results are 2.1% and 3.4% for pressure ratio and isentropic efficiency respectively. After validating the theoretical-experimental relations which are used for one-dimensional modeling with experimental and 3D modeling they are used to design a two stage axial-flow compressor. A two stage axial flow compressor with defined geometry is redesigned and its characteristic curves are determined by performance prediction program. The results show 14% diameter increase and 25% decrease of axial length of the compressor. Also, the redesigned compressor produces more pressure ratio than the original.This design program is capable of designing through three geometric methods: constant mean diameter, constant tip diameter and constant hub diameter. At the end, these three design procedures are compared resulting, the CHD method produces more pressure ratio and isentropic efficiency
  9. Keywords:
  10. Three Dimensional Modeling ; Axial Compressor ; One-Dimentional Modeling ; Axial Compressor Design ; Design and off-Design Condition

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