This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Numerical Analysis of Underbody Diffusers with Different Angles and Channels
Technical Paper
2019-01-0668
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The underbody diffusers are used widely in race cars to improve the flow field structure at the bottom of the car and provide enough downforce. In recent years, passenger cars have begun to use bottom diffuser to improve aerodynamic characteristics, so as to reduce drag and increase downforce. In this paper, the aerodynamic characteristics of the bus with different underbody diffuser angles and channel numbers are studied by numerical simulation analysis. Firstly, the aerodynamics of the bus under different diffuser inlet and outlet angles are studied, and then an optimal inlet and outlet angle is determined based on the simulation results. Then, using this angle as a constant, the 2, 3, and 4 channel numbers were chosen as the diffuser channel variables to study the influence of the multiple-channel diffusers on the aerodynamic drag of the vehicle. The results of the study show that reasonable diffuser inlet and outlet angles can improve the bottom pressure distribution and wake structure of the bus, resulting in a maximum increase in downforce of 38.2%. In addition, under a certain diffuser angle, the effect of number of diffuser channels on lift and drag is small.
Recommended Content
Authors
Citation
Tian, J., Liu, X., Zhang, Y., and Chen, Q., "Numerical Analysis of Underbody Diffusers with Different Angles and Channels," SAE Technical Paper 2019-01-0668, 2019, https://doi.org/10.4271/2019-01-0668.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 |
Also In
References
- Widodo , W.A. and Karohmah , M.N. CFD Based Investigations into Optimization of Diffuser Angle on Rear Bus Body Applied Mechanics and Materials 836 127 131 2016
- Gurlek , C. , Sahin , B. , and Ozkan , G.M. PIV Studies Around a Bus Model Experimental Thermal and Fluid Science 38 115 126 2012
- Rasu , N.G. , Renil , A.M. , and Sachin , S.J. CFD Analysis of Commercial Bus Models for Improvement of Aerodynamic Performance Journal of Chemical and Pharmaceutical Sciences 974 2115 2016
- Lai , C. , Kohama , Y. , Obayashi , S. et al. Experimental and Numerical Investigations on the Influence of Vehicle Rear Diffuser Angle on Aerodynamic Drag and Wake Structure International Journal of Automotive Engineering 2 2 47 53 2011
- Hu , X. , Zhang , R. , Ye , J. et al. Influence of Different Diffuser Angle on Sedan's Aerodynamic Characteristics Physics Procedia 22 239 245 2011
- Sucipto , S.A. and Widodo , W.A Numerical Study of Multiple-Channel Diffusers on the Rear Bus Body AIP Conference Proceedings 1788 1 030094 2017
- Jowsey , L. and Passmore , M. Experimental Study of Multiple-Channel Automotive Underbody Diffusers Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 224 7 865 879 2010
- Hassan , S.M.R. , Islam , T. , Ali , M. et al. Numerical Study on Aerodynamic Drag Reduction of Racing Cars Procedia Engineering 90 308 313 2014
- Tyagi , A. and Madhwesh , N. Design and Numerical Analysis of an Under Tray Diffuser of a Formula Student Car for Performance Improvement SAE Technical Paper 2017-01-5016 2017 10.4271/2017-01-5016
- Yingchao , Z. Numerical Simulation Technology of Automotive Aerodynamics Beijing Peking University Press 2011
- Lienhart , H. and Becker , S. Flow and Turbulence Structures in the Wake of a Simplified Car Model SAE Technical Paper 2003-01-0656 2003 10.4271/2003-01-0656