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Technical Paper

Intake Port Flow in a Fired Two-Stroke Engine

1993-03-01
930495
Velocity information was collected from an intake port of a single-cylinder piston-ported two-stroke engine by a Laser Doppler Velocimeter (LDV) system to better understand and quantify the behavior of intake flow exiting into the cylinder during the scavenging process. Ten measurement locations were chosen along a vertical line through the center of the port exit area. Motored and fired (skip-fired) radial velocity measurements were recorded at engine speeds of 600, 900, and 1200 RPM along with cylinder, intake (two positions), and exhaust pressure data. The ensemble-averaged mean radial velocities during motoring, when plotted versus crankangle, are generally flat over most of the port area and influenced by changes in the pressure differential between the intake and exhaust ports. During the initial phase of the port opening, a high velocity jet exits from the port causing a peak in the mean radial velocity profile.
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