Loading...

Aerodynamic Design of Twin-entry Radial-inflow Turbine's Impeller

Vaezi, Siavash | 2015

573 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48155 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy Benisi, Ali
  7. Abstract:
  8. The purposes of this research are one and three dimensional aerodynamic designs of a twin entry radial-inflow gas turbine's impeller. The GT4082 model Garrett turbocharger was chosen for this purpose. In order to predict existing turbine performance curves one dimensional model was prepared for whole turbine. For validating the 1d-modeling's results, widespread tests were performed on the turbine at Sharif University of Technology turbocharger lab. Comparing the results of 1d-modeling with experimental results, show 4.7% and 4% max difference for efficiency and mass parameter respectively. The wheel designing procedure started from primary design based on the mean line assumption, in 1-d code. Due to geometrical constraints the dimensions of designed wheel show slight difference with existing wheel, while blade number increases from 10 to 14. Then the turbine with designed wheel was modeled and performance prediction results compared with that of turbine with existing wheel, showing increase in efficiency up to 7.5% in 40 thousand rpm rotational speed and decrease in mass parameter up to 22% in 60 thousand rpm,. In the next step, detail design was carried out, in which blade profiles at hub and shroud, as well as blade angle from inlet to outlet were changed. Then three dimensional shape of the wheel with combining them in Bladegen, was achieved. Comparing this configuration with existing wheel's geometry that obtained with laser scanning procedure, show differences, especially in inlet region. At the end of this research, having done three dimensional simulation on two wheels and considering effects of some losses such as tip leakage, and incidence on flow conditions, and efficiency decrease, show that the existing wheel is more affected by these losses. The maximum increase in efficiency is 3.5% and achieved in 40 thousand rpm rotational speed
  9. Keywords:
  10. Aerodynamic Design ; One-Dimentional Modeling ; Three-Dimensional Simulation ; Twin-Entry Radial Inflow Turbine ; Turbocharger GT4082

 Digital Object List

 Bookmark

No TOC