Analysis of unsteady gas flow in a plain pipe exhaust system of a firing engine and its side effect upon the performance of a naturally aspirated two-stroke oil engine

[摘要] The present investigation is part of a long term research programme dealing with the wave action in the exhaust and induction pipes of a two-stroke oil engine and their effect upon the cylinder scavenge process. As a development of fundamental researches carried out at the University Laboratories using simulated cylinder release pressures in a motored engine, the present investigation seeks to extend the established data to the practical problem of the engine under firing conditions. In this report, the theoretical analysis of unsteady one-dimensional gas flow, all owing for the effects of wall friction, heat exchange with the surroundings, and temperature discontinuities is developed, and the Method of Characteristics is applied to effect a solution. Theoretical exhaust pipe and cylinder indicator diagrams are evaluated using this theory, and compared with the experimental diagrams from the firing engine. From performance trials, the measured air consumption using a constant air/fuel ratio, but different exhaust pipe lengths and engine speeds, is evaluated and plotted on a dimensionless basis for comparison with the previous simulated work.

[发布机构] University:University of Birmingham;Department:School of Engineering, Department of Mechanical Engineering

[关键词] T Technology;TJ Mechanical engineering and machinery