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Exergy Analysis of Turbochargen Systems in the Internal Combustion Engines

Goudarzi, Amir | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43963 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Mozafari, Ali Asghar; Ali Ehiaee, Mahdi
  7. Abstract:
  8. Thermodynamic analysis of a system is a method for recognizing the type of energy transmission between system and surrounding environment. It also helps to find how macroscopic properties of the system change during this process. This analysis is based on first and second laws of thermodynamic. The first law expresses conservation of energy and inspects quantity of energy transmission but doesn’t evaluate quality of energy. The second law expresses quality of energy and the ability of doing work. The analysis that uses both of the laws is named exergy analysis. By exergy analysis the place of useful energy losses in the system can be determined. In this research the exergy analysis of turbocharged spark ignition internal combustion engines is considered. For this purpose, in the first step, performance of turbocharged system's main members i.e. compressor, inter cooler, engine and turbine is studied. A three-zone model with uniform fluid properties in each zone is used for performance simulation of engine. Also turbine and compressor performance model is developed by one dimensional approach. The intercooler performance modeling is also done by using experimental results obtained for compact heat exchangers. The effects of passing flow through each member and related sub members on the exergy contents of the flow are studied. Then second law efficiency of each member is calculated. In the next step, turbocharger effects on performance of internal combustion engines at different working conditions are examined and the results are compared with those obtained for naturally aspirated state. In the last step, a method for matching of engine and turbocharger at a working point is presented and the effect of turbocharged system on total irreversibility is studied. From the presented results it can be concluded that combustion process produces the most proportion of the system irreversibility
  9. Keywords:
  10. Intercooler ; Exergy Analysis ; Internal Combustion Engines ; Turbocharging ; Turbines ; Compressor

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