Studies of transient diesel spray characteristics at high injection pressures were conducted in a constant volume chamber by utilizing a high speed photography and light extinction optical diagnostic technique. Two different types of nozzle hole entrances were investigated: a sharp-edged and a round-edged nozzle. The experimental results show that for the same injection delivery, the sharp-edged inlet injector needed a higher injection pressure to overcome the higher friction loss, but it produced longer spray tip penetration length, larger spray angle, smaller droplet sizes, and also lower particulate emission from a parallel engine test. For the round-edged and smooth edged tips at the same injection pressure, the sharp-edged inlet tip took a longer injection duration to deliver a fixed mass of fuel and produced larger overall average Sauter Mean Diameter (SMD) droplets. The sharp-edged inlet also produced shorter penetration, but almost the same spray angle for both high and low fuel delivery cases.
Nozzle Effect on High Pressure Diesel Injection
Sae Technical Papers
International Congress & Exposition ; 1995
1995-02-01
Conference paper
English
Nozzle Effect on High Pressure Diesel Injection
Automotive engineering | 1995
|Diesel Sprays - Effect of lnjection Pressure, Nozzle Hole Diameter and split Injection
British Library Conference Proceedings | 2006
|New Diesel injection nozzle for optimized injection rate
Online Contents | 1995
New fuel injection nozzle for high speed diesel and gasoline injection engines
Engineering Index Backfile | 1942
|Optimization of the Diesel Engine Injection Nozzle
SAE Technical Papers | 1993
|