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Flattening the Torque Curve of a Two-Stroke Engine with a Fluid Diode Installed at the Scavenge Port
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English
Abstract
The typical convex torque of a simple two-stroke engine having a port-controlled piston is attributed to the backflow through the scavenge ports. It is proposed here to suppress the backflow by installing scroll diodes at the scavenge ports. Experimental observations on a fired engine demonstrate the remarkable improvement achieved with the diodes installed. The effect of the diodes presence on the engine power and on the delivery ratio is discussed by using a recorded diagram of the crankcase pressure variation with crank-angle during the gas exchange process.
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Sher, E. and Yafe, H., "Flattening the Torque Curve of a Two-Stroke Engine with a Fluid Diode Installed at the Scavenge Port," SAE Technical Paper 830092, 1983, https://doi.org/10.4271/830092.Also In
References
- SAE “Recommended Practice, Engine Terminology and Nomenclature,” SAE J. 604C, SAE 24.01 1979
- Nagao, F. Nishiwaki, K. Kato K. Iijima, T. “Prevention of Backflow in a Crankcase-Scavenged Two-Stroke Engine by Fluid Diodes,” Bull. J.S.M.E. 14 71 483 492 1971
- Sher, E. “Improving the Performance of a Crankcase-Scavenged Two-Stroke Engine with a Fluid Diode,” Proc. I. Mech. E. 196 23 24 1982
- Sher, E. “Theoretical and Experimental Study of the Scroll Diode Characteristics under Steady Conditions,” Fluidics Quar.- The J. of Fluid Control 4 57 70 1980