Prediction of a Turbocharger Performance Under Pulsating Flow by Construction of an Unsteady One-Dimensional Flow Analysis Model

다국어 초록 (Multilingual Abstract)

In recent years, because of the energy crisis, improving the thermal efficiency of automobiles has become a very important issue. It is known that a pulsating flow generated by engine valves affects the performance and efficiency of the turbocharger adversely [1]. However, the turbocharger characteristics under pulsating flow have not been clarified to a satisfying degree yet, and no prediction method of turbocharger performance has been established yet. In this study, an unsteady one-dimensional flow model of a turbocharger is constructed by modeling the physics of aerodynamic loss and unsteady characteristics based on experiments and 3D-CFD. Furthermore, the characteristics of the turbocharger under pulsating flow were predicted using the built one-dimensional unsteady flow model. Moreover, this one-dimensional model was implemented in GT-Power which is a one-dimensional commercial code used by many automobile companies.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Algorithm of the flow model
• 3. Pressure loss equation of the one dimensional flow model
• 4. Turbine and compressor experimental apparatuses
• 5. Comparison with the experimental results and the one dimensional analysis results
• 6. Unsteady flow model
• 7. Coupled analysis using GT-Power
• 8. Conclusion
• References

참고문헌 (Reference)

1 Karamanis N., "mixed flow turbines: inlet and exit flow under steady and pulsating conditions" 123 : 359-391, 2001

2 Saki Shiratori, "Unsteady Behavior of Radial Fan under Pulsating Flow Field" 2016

3 F. Bozza, "Unsteady 1D simulation of Turbocharger Compressor" 2 (2): 189-198, 2009

4 Paul Moraal, "Turbocharger Modeling for Automotive Control Applications" 1999

5 Yohei Nakamura, "Mechanism of Unsteady Behavior of Radial Fan in Pulsating Flow" 2015

6 Chinen Manato, "Construction of turbocharger one-dimensional unsteady flow model and evaluation of pulsating flow characteristics [Translated from Japanese]"