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CFD Characterization of Fuel Flow in Small Metering Orifices Used In Carburetors
Technical Paper
2006-32-0110
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Although each carburetor design is slightly different, it is possible to define some basic elements that can be used as building blocks to describe many carburetor designs. All carburetors designs use small metering orifices to constrain fuel and air flow through different circuits. This paper presents the CFD analysis of fuel flow across small metering orifices typically found in small engine carburetors. The analysis was divided into three parts: first, CFD simulations of liquid flow in square-edged orifices were performed. These simulations indicated the appropriate turbulent model and numerical parameters to be used in the study of orifices with more complex geometries. Second, inlet and outlet chamfers were added to the square-edged orifices, which allowed for understanding their effect on the characteristics of the flow.
Finally, the simulations were performed on geometries that represented metering orifices found in real carburetors. The verification of the CFD predictions with experimental results showed a good agreement. The information obtained from the CFD simulations were used to develop correlations for the real orifices. These correlations are simple enough so they can be incorporated into a flow network model of carburetor fuel flow.
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Authors
Citation
Arias, D. and Shedd, T., "CFD Characterization of Fuel Flow in Small Metering Orifices Used In Carburetors," SAE Technical Paper 2006-32-0110, 2006, https://doi.org/10.4271/2006-32-0110.Also In
References
- Heywood J. Internal Combustion Engine Fundamentals McGraw Hill New York 1988
- Bolt J. A. Derezinski S. J. Harrington D. L. Influence of fuel properties on metering in carburetors SAE technical report, ( 3710207 ) 1971
- Keyser D. R. Towards the correct equation for the coefficient of discharge of an orifice flow meter Transactions of the ASME - Joint Power Generation Conference 32 2 439 446 1997
- Hall G. W. Application of boundary layer theory to explain some nozzle and venturi flow peculiarities Proceedings of the Institution of Mechanical Engineers 173 36 837 842 1959
- Benedict R. P. Generalized fluid meter discharge coefficient based solely on boundary layer parameters Journal of Engineering for Power 101 1 572 575 1979
- Murdock J. W. Keyser D. R. Theoretical basis for extrapolation of calibration data of PTC 6 throat tap nozzles Journal of Engineering for Gas Turbines and Power 113 2 228 232 1991
- Murdock J. W. Keyser D. R. A method for the extrapolation of calibration data of PTC 6 throat tap nozzle Journal of Engineering for Gas Turbines and Power 113 2 233 241 1991
- Hall G. W. Analytical determination of the discharge characteristics of cylindrical-tube orifices Journal of Mechanical Engineering Science 5 1 837 842 1963
- Morrison G. Euler number based orifice discharge coefficient relationship Journal of Fluids Engineering 125 1 189 191 2003
- Mirsky W. Bolt J. A. Smith G. E. Flow characteristics of the carter type 120-166 carburetor metering jet Technical Report 2813 University of Michigan 1959
- Johansen F. C. Flow through pipe orifices at low reynolds numbers Proceedings of the royal society of London 126 801 231 245 1930
- Bolt J. A. Mirsky W. Currie J. H. Visual flow studies of carter carburetor jets Technical Report 2813 University of Michigan 1960
- Barry J. J. Numerical simulation of flow through orifice meters Technical Report GRI-92/0060.1 Gas Research Institute 1992
- Schmidt D. P. Rutland C. J Corradini M. L. A numerical study of cavitating flow through various nozzle shapes. SAE technical report, 971597 1997
- Celik I. Zhang W.M. Calculation of numerical uncertainty using Richardson extrapolation: application to some simple turbulent flow calculations Journal of Fluids Engineering 117 3 439 445 1995
- Celik I. Karatekin O. Numerical experiments on application of Richardson extrapolation with nonuniform grids Journal of Fluids Engineering 119 3 584 590 1997