Multiple-hole Nozzle Atomization for SI Engines 1999-01-0564
Fuel atomization is known as an effective means of reducing exhaust emissions from internal combustion engines. In this study, we present a cost-effective atomization method for multiple-hole nozzle gasoline injection systems that requires no auxiliary device or external energy source to carry out atomization.
While many studies have been conducted before on the atomization mechanism, most assume that the key to atomization lies in the nozzle configuration or the interaction between the fuel spray and ambient air.
We, on the other hand, paid particular attention to the fuel nozzle upstream flow and found how it plays a crucial role in fuel atomization. In case of using multiple-hole nozzle in particular, atomization is greatly influenced by impingement of upstream flow of the fuel nozzle, which leads to rapid directional change in the fuel flow. Spray direction and spatial distribution are determined by controlling the main spray consisting of multiple sprays from each injection point.
Our newly developed multiple-hole nozzle improves a fuel atomization performance, yet achieving required spray orientation in combination with a flat tip valve needle.