Abstract
With laser-induced fluorescent method, two-dimensional visualization of liquid fuel films on the quartz cylinder liner is carried out to investigate the effect of wall fuel film on the HC emissions. Using a quartz liner and a special lens, only the liquid fuel on the cylinder liner can be visualized. The calibration technique is developed to quantify the fluorescence signal. The fluorescence intensity increases linearly with increase in the fuel film thickness on the quartz liner. Using this technique, the wall-wetting fuel mass on the cylinder wall is measured quantitatively in the test rig.