Abstract
Measurement was made of the ambient gas flow field induced by the D.I. Diesel spray by means of the particle image velocimetry combined with laser induced fluorescence (LIF-PIV) technique. The Diesel fuel spray was injected into the constant volume vessel where the fluorescent tracer particles were well dispersed. The fluorescent light images from the tracer particles illuminated by the double-pulsed Nd:YAG laser sheet were only captured by a CCD camera by installing the long-pass filter in front of the camera lens. The tracer particle images were analyzed by the PIV system to obtain the ambient gas flow field. It was found that the region with the strong entrainment flow into the spray appears in the region of the upstream nozzle side and its vectors increase at the end of fuel injection. Then the vectors decreases and the region moves in the down stream direction as time proceeds.
