Combined Measurement by Photography and Gas Sampling for Combustion Analysis in a Diesel Engine Cylinder

摘要: Schlieren and direct cine photography were used in conjunction with the gas sampling method to investigate three-dimensional combustion phenomena a injection diesel engine cylinder. Observations included burned unburned movement, dispersion of fuel-air mixture after fuel spray impingement on cavity wall, process under continuous running conditions. Gas concentrations nitrogen oxides (NOx), total decomposed hydrocarbons, carbon monoxide, dioxide, oxygen, hydrogen analyzed. It was found that carried by air swirl before wall diffuses rapidly direction is distributed symmetrically along axis. Air accelerates homogeneity wall. The rapid flame growth corresponds first stage period heat release diagram, at this time equivalent concentration uniformly but remains heterogeneous cylinder axis direction. During ignition delay, 70% decomposes occurs position high C5-C8 hydrocarbons. Intermediate products are produced as long hydrocarbons (THC) detected. Extinction THC coincides product generation (80% combustion). NOx content increases when spreads temperature high.