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Cycle-Resolved Flow Measurements in the Exhaust Pipe of Single Cylinder Two Stroke Engines
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Abstract
The instantaneous flow from the exhaust pipe of a single cylinder two stroke engine was studied in this research. Three exhaust pipes were investigated. One is a simple pipe with an expansion chamber, and the other two are commercial exhaust pipes. The flow field in the exhaust pipe was calculated using the one-dimensional unsteady gas dynamic model. The instantaneous velocity of the exhaust flow was detected using a hot wire anemometer located at the exit of the exhaust pipe.
The calculated pressure variations inside the chambers of the exhaust pipe agreed quite well with the measured data. The calculated instantaneous exhaust velocity also matched the measured velocity variations in cases where reverse flow did not occur. However, discrepancies occurred at low engine speeds because the hot wire anemometer can not distinguish between forward and reverse flow. If the measured cycle-resolved velocity was adjusted to account for the effect of reverse flow, both the total flow in the entire cycle and the instantaneous flow rates obtained from model calculations agreed quite well with the measured data.
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Citation
Lu, J., Sheu, Y., Liu, D., and Hsiao, C., "Cycle-Resolved Flow Measurements in the Exhaust Pipe of Single Cylinder Two Stroke Engines," SAE Technical Paper 980759, 1998, https://doi.org/10.4271/980759.Also In
References
- Jones A.D. 1984 “Modeling the Exhaust Noise Radiated from Reciprocating Internal Combustion Engines - A Literature Review” Noise Cont Engr J. 23 1 12 31
- Blair G.P. Spechko J.A. 1972 “Sound Pressure Levels Generated by Internal Combustion Engine Exhaust System” SAE Paper 720155
- Blair G.P. Cahoon W.L. 1972 “A More Complete Analysis of Unsteady Gas Flow Through a High-Specific-Output Two-Cycle Engine” SAE Paper 720156
- Blair G.P. Coates “Noise Produced by Unsteady Exhaust Efflux from an Internal Combustion Engine” SAE Paper 730160 1973
- Coates S.W. Blair G.P. 1974 “Further Studies of Noise Characteristics of Internal Combustion Engine Exhaust Systems” SAE Paper 740713
- Karnopp D.C. Dwyer H.A. Margolls D.L. 1975 “Computer Prediction of Power and Noise for Two-Stroke Engines with Power Tuned, Silenced Exhaust” SAE Paper 750708
- Jones A.D. Brown G.L. 1982 “Determination of Two Stroke Engine Exhaust Noise by the Method of Characteristics” J. Sound Vib. 82 3 305 327
- Ferrari G. Castelli R. 1985 “Computer Prediction and Experimental Tests of Exhaust Noise in a Single Cylinder Internal Combustion Engine” Noise Cont Engr. J. 24 2 50 56
- Takeyama S. Takeda H. Takagi Y. 1991 “Reduction in Exhaust Noise Through Exhaust Valving Modifications Achieved with a Gas Dynamics Simulation Model” SAE Paper 910617
- Morel T. Morel J. Blaser D.A. 1991 “Fluid Dynamic and Acoustic Modeling of Concentric Tube Resonators Silencers” SAE Paper 910072
- Lu Jau-Hual Yang Hsiu-Feng 1996 “Measurements and Analysis of the Exhaust Noise of Single Cylinder Two Stroke Engines” SAE Paper 960369
- Benson Rowland S. 1982 “The Thermodynamics and Gas Dynamics of Internal Combustion Engine” I Clarendon Press
- Kinsler Lawrence E. Frey Austin R. Coppens Alan B. Sanders James V. 19982 “Fundamental of Acoustics” Third John Wiley & Sons