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Nozzle Effect on High Pressure Diesel Injection
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English
Abstract
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.
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Authors
Citation
Su, T., Farrell, P., and Nagarajan, R., "Nozzle Effect on High Pressure Diesel Injection," SAE Technical Paper 950083, 1995, https://doi.org/10.4271/950083.Also In
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