Cyclic Variation in a Two-Stroke Engine : 1st Report, Correlation between Velocity, Pressure and HC Concetration

Abstract

Cyclic variation analysis was demonstrated to grasp scavenging flow fluctuation in a practical small two-stroke engine in terms of pressure, velocity and HC emission. Simultaneous measurements of velocity, pressure and HC emission were carried out in an exhaust pipe with high time resolution over thousand cycles. The results show typical variation characteristics of scavenging flow and gas exchange in the cylinder, which can be estimated by pressures at the crankcase and the exhaust pipe. The HC emission variation was examined with time-series IMEP.