Abstract
In order to investigate the influence of the cavitation on the spray characteristics of the biodiesel, a spray nozzle flow visualization experiment system was established, images of nozzle flows and sprays under different pressure conditions were recorded by a high speed camera. For comparison, gas oil and water were employed. The experimental results showed that, with the increasing of injection pressure, the cavitation region extended from entrance to interior along the flowing direction in the spray nozzle. When the injection pressure continued to increase, the cavitation region extended to the outside of spray nozzle and a jet flow was caused, then spray cone angle decreased rapidly to only half of the maximum spray cone angle.
