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A Theoretical and Experimental Study of Resonance in a High Performance Engine Intake System: Part 2
Technical Paper
2007-01-1399
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The unsteady gas dynamic phenomena in a racecar airbox have been examined, and resonant tuning effects have been considered. A coupled 1D/3D analysis, using the engine simulation package Virtual 4-Stroke and the CFD package FLUENT, was used to model the engine and airbox. The models were experimentally validated. An airbox was designed with a natural frequency in the region of 75 Hz. A coupled 1D/3D analysis of the airbox and a Yamaha R6 4-cylinder engine predicted resonance at the single-cylinder induction frequency; 75 Hz at an engine speed of 9000 rpm.
The amplitude of the pressure fluctuation was found to be influenced by the separation between the intake pipes in the airbox. For an n-cylinder even-firing engine, if the intakes are coincident in the airbox, then the fundamental and all harmonics of the forcing function, apart from the (n-1)th, (2n-1)th, etc. will cancel. That is, only the multi-cylinder induction frequency and its multiples will not cancel. If the intakes are spatially separated, as in a real airbox, complete cancellation of the harmonics in the forcing function will not occur. The degree of cancellation depends on the separation distance of the intakes.
Three different intake pipe configurations were investigated numerically and experimentally. The experimental results showed good correlation with the 1D/3D predictions. At an engine speed where the single-cylinder induction frequency matched the natural frequency of the airbox, the amplitude of the low frequency pressure fluctuation inside the airbox was found to increase as the separation of the intake pipes was increased.
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Brennan, S., Kee, R., Kenny, R., Fleck, R. et al., "A Theoretical and Experimental Study of Resonance in a High Performance Engine Intake System: Part 2," SAE Technical Paper 2007-01-1399, 2007, https://doi.org/10.4271/2007-01-1399.Also In
References
- BRENNAN, S. KEE R.J. KENNY R.G. FLECK R GAYNOR J. FLECK B. 2006 A Theoretical and Experimental Study of Resonance in a High Performance Engine Intake System: Part 1 SAE Paper No. 2006-01-3653 SAE Motorsports Conference Detroit Dec. 2006
- MAYNES, B.D.J. KEE, R.J. KENNY, R.G. FLECK, R. MACKEY, D.O. FOLEY, L. 2002 Prediction of Formula 1 Engine and Airbox Performance Using Coupled Virtual 4-Stroke and CFD Simulations SAE Transactions 111 2779 2795
- DE VITA, A. DI ANGELO, L. ANDREASSI, L. 2003 CFD Analysis of Engines: An Advanced Approach Based on Codes Dynamically Coupled ASME Internal Combustion Engine Division ICE; Design, application, performance and emissions of modern internal combustion engine systems and components May 2003 40 585 594
- RIEGLER, U.G. BARGENDE, M. 2002 Direct Coupled 1D/3D-CFD-Computation (GT-Power/Star-CD) of the Flow in the Switch-Over Intake System of an 8-Cylinder SI Engine with External Exhaust Gas Recirculation SAE Paper No. 2002-01-0901 SAE World Congress & Exhibition Detroit March 2002
- SINCLAIR, R. SCHINDLER, P. STRAUSS, T. 2002 Validated 1D/3D Coupling Method to Solve Transient Flow in Internal Combustion Engines ASME Pressure Vessels and Piping Division 2002 448 197 203
- OPTIMUM POWER TECHNOLOGY Virtual 4-Stroke engine simulation software user's guide Bridgeville, PA, USA
- BLAIR, G. P. 1999 Design and Simulation of Four-Stroke Engines SAE Warrendale, PA, USA
- KER WILSON, W. 1963 Practical Solution of Torsional Vibration Problems Volume II Amplitude Calculations Third Chapman & Hall Ltd 390 404