Theoretical and Experimental Investigation of Losses in Twin-Entry Radial Inflow Gas Turbine under Full and Partial Admission Conditions

Shahhosseini, Majid Reza | 2009

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 39230 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Rad, Manoucher; Hajilouy Benisi, Ali
  7. Abstract:
  8. The twin-entry radial inflow gas turbine is extensively used in engine turbochargers. The use of twin-entry radial flow turbine in the turbocharging systems makes it possible to use the kinetic energy of pulsating exhaust gases. This turbine is usually exposed to partial admission conditions in engine operating conditions, which the flows in each inlet are not equal for most of the time. This partial admission varies from zero flow in one entry with full admission in the other, to full flow in both entries. The flow pattern in this turbine is complex and three dimensional due to geometry and inlet conditions. Therefore, better understanding of the flow pattern and losses in the turbine can help to present better turbine performance. Better understanding the physics of the flow pattern and analyzing the process of loss generation in different sections of the twin entry radial inflow gas turbine are the purposes of this research. Meanwhile, for simulation of the twin entry radial turbine performance characteristics under full and partial admission conditions, a loss models are developed. The experimental investigation of the twin entry turbine is performed at turbocharger laboratory of Sharif University of Technology. In this lab, the performance characteristics of different twin-entry turbine are considered under different partial admission conditions. Using five-hole probe, the flow field and loss pattern in the downstream of the rotor are studied. Three-dimensional numerical simulation is carried out to complete the experimental results. The numerical results are compared with experimental data, and good agreement is obtained. Also, the flow field of different sections of turbine is considered. Furthermore, the loss models are modified to obtain appropriate performance characteristics in different partial admission conditions. The results of these models show good agreement with experimental data for two different turbines, and, the maximum error for efficiency is 3 percent
  9. Keywords:
  10. Energy Loss ; Turbochargers ; Partial Admission Conditions ; Full Admission Conditions

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