Turbulence and turbulent combustion in spark-ignition engines

The effects of mixture turbulence on combustion in a spark- ignition engine were investigated using a CFR engine. The apparent instantaneous turbulent flame speed during combustion was calculated from a combustion head release model that used measured cylinder pressures and assumed spherical flame propagation. This flame speed was correlated with turbulent intensities measured in the motored engine. The ratio of fully developed turbulent flame speed to laminar flame speed was found to be a linear function of motored turbulent intensity. /GMRL/

Effects of Turbulence on Spark-Ignition Engine Combustion

The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy

The Nature of Turbulent Flame Propagation in a Homogeneous Spark-Ignited Engine

Fundamental study on combustion diagnostics using a spark plug as ion probe

The effects of turbulence on the flame propagation in the propane-air mixture in a closed vessel were investigated by analyzing the high speed motion pictures of flame, the ion-currents due to combustion and the change of the gas compositions in combustion zone. In the combustion chamber, the uniform turbulent conditions were produced by moving suddenly a perforated plate which was driven by the spring and the electro-magnetic control system. The main results are as follows: (1) The combustion zone of turbulent flame may be composed of a lot of flame elements which are similar to laminar flame, and the apparent burning velocity is increased by enlargement of combustion zone due to turbulence. (2) during the early stage following ignition, the flame speed is affected by both factors of mixture strength and intensity of turbulence. with further development of the flame, however, the intensity of turbulence becomes a dominant factor determining thee flame speed.

Akira Kizima

Papers

Effects of Turbulence on Flame Propagation in Closed Vessel