Nozzle effect on high pressure diesel injection
Technical Report
·
OSTI ID:147360
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.
- Research Organization:
- Wisconsin Univ., Madison, WI (United States)
- OSTI ID:
- 147360
- Report Number(s):
- AD-A--295982/3/XAB; CNN: Contract DAAL03-92-G-0122
- Country of Publication:
- United States
- Language:
- English
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