Dissertation > Excellent graduate degree dissertation topics show

Multi-point Through-flow Design Approcach of a Centrifugal Compressor for Internal Combustion Engine Turbocharging

Author: ChenTao
Tutor: ZhangYangJun
School: Tsinghua University
Course: Power Engineering and Engineering Thermophysics
Keywords: engine downsizing turbocharging centrifugal compressor through-flow model multi-point design
CLC: U464.13
Type: PhD thesis
Year: 2010
Downloads: 72
Quote: 0
Read: Download Dissertation

Abstract


Much greater emphasis of turbocharging technology is being placed on downsizing the internal combustion engine （ICE） to increase fuel economy and reduce CO2 emissions. But the fundamentally difference between rotating turbomachines and reciprocating piston engines lead to poor engine performance at off-design conditions, which is the main difficulty for engine downsizing. Traditionally, the turbocharger compressor design is independent from the engine system development process and the compressor is not usually designed for the improvement of ICE’s performance on all operation conditions.According to the key, a centrifugal compressor multi-point through-flow design approach was developed to improve the ICE’s overall performance. The influence of compressor characteristics on turbocharged engine system, sophisticated flow mechanism on different operation conditions and compressor multi-point design optimization was discussed. The thesis work contains contents as follows:The influence of different compressor characteristics on ICE’s performance on all operation conditions was investigated. The results show that the compressor off-design characteristics have great effect on engine performance. The location of compressor high efficiency island was the most influential factor for the ICE’s performance on low speed and part-load conditions.Through the detail research on a small turbocharger compressor internal flow mechanism, the acting factors which changed the compressor MAP characteristics were investigated. The main compressor geometrical parameters were discussed and it was found that four impeller structures, including inlet tip diameter, inlet tip blade angle, outlet width and outlet backsweep angle, have the greatest influence on compressor overall performance.Based on the inside flow mechanisms of centrifugal compressors, a through-flow model was developed to predict the compressor overall performance with various structure parameters. The model was calibrated and validated with the test data of nine different compressors. Based on the through-flow model, a compressor multi-point through-flow design approach was developed with the objective of ICE’s performance for all operation conditions. During the through-flow design process, the direct influence of compressor geometry parameters on ICE’s overall performance can be considered.The multi-point through-flow design approach was successfully applied to a 1.8L turbocharged gasoline engine to develop a new turbocharger compressor. The efficiency has been improved obviously on low flow rate conditions of the new designed compressor. Simulation resultes show that the low-end torque of the turbocharged gasoline engine matched with the new compressor has been increased by 21% and part-load fuel consumption has been decreased by 2.4%.

Related Dissertations

  1. Research and Implementation of Non-rigid Medical Image Registration Method Based on Improved Optical Flow Model,TP391.41
  2. Design and Application of Centrifugal Compressor Monitoring System,TP277
  3. Research on Reverse Rotation During the Multi-Stage Centrifugal Compressor Failure Shutdown Process,TH452
  4. Vehicle self-organizing network connectivity study,TN929.5
  5. Research and Application of Traffic Network Model on Urban Road with Hybrid Petri Nets,U491.112
  6. Research on the "Shortage of Off-farm Workers" Based on Population Floating Model,F249.2
  7. Study and Application of Echnology Exploration Data Management in Geophysical Prospecting for Petroleum,TP311.13
  8. Research on Characteristics of Circumfluence in Zhoushan Liuheng Island,TV148.2
  9. Study on Collective Flow Features of Net-proton and Strange Particles,O4-09
  10. The Application of 2-D Numerical Model of Wind, Wave, Tidal Current and Sediment in New Ro-Ro Terminal of Tianjin Port,U612.23
  11. Analysis and structural optimization of the internal flow field of single-stage centrifugal compressor,TH452
  12. Air separation device air compressor anti-surge control system,TH452
  13. Numerical Study of Flow Characteristics and Performance Inside Centrifugal Impeller,TH452
  14. Technical Research on Offline Document Security with Information Flow Model,TP309.2
  15. Physically-based Simulation for Highly Detailed Fluids,TP391.41
  16. The Research on the Enterprise Value Assessment by Using Discouted Free Cash Flow Model,F275
  17. Comparison of Turbulence Model and Numerical Simulation of Aerodynamic Performance in Turbomachinery,O357.5
  18. Moxi Kerry two gas reservoirs unstable productivity evaluation research,TE328
  19. Energy Flow Model of Oil Tank Farm and Its Energy Consumption Analysis,TE972.1
  20. The Reasonable Limit Research of Production Parameters of Pubei Oilfield Gathering System,TE866
  21. Design and Implementation of Centrifugal Compressor Control System in OIL Refinery,TQ051

CLC: > Transportation > Road transport > Automotive Engineering > Automotive engine > Reciprocating engine > Components, parts
© 2012 www.DissertationTopic.Net  Mobile