Burning rate and stability in forechamber flame ignition in an internal-combustion engine

Abstract

This article reports on experimental and theoretical studies on the burning laws in the working volume of an internal-combustion engine with forechamber flame ignition. The experiments were performed with a single-cylinder engine with a working volume of V /SUB h/ =600 cm/sup 3/. In the presented calculations, it is assumed that when the mixture in the forechamber is ignited at a point far from the exit holes, the ignition in the working volume produced by the products occurs after the completion of combustion in the forechamber. The behavior of the turbulence localized at the start in a spherical core is considered in order to identify the main features of the damping. The results indicate that the burning rate is variable in time, the fall in the burning rate is associated with decay of the pulsations in the turbulent core formed by the outflow from the forechamber, the high initial burning rate with the small scale of turbulence in the core produces considerable burning stabilization, and