In the present study, a commercial high pressure, common rail injection system for automotive DI diesel engines was fed with a conventional diesel fuel, a bio-derived fuel and a blend of them. The comparison of spray characteristics was carried out in terms of tip penetration and cone angles; the fuel spray, generated by rail pressures ranging from 60 MPa to 120 MPa, developed in an atmospheric chamber. The experimental set-up is based on a laser sheet technique. The radiation scattered by the spray, generated by a Nd Yag pulsed laser, is collected by a CCD camera and fed to a frame grabber. A suitably set up automatic image analysis process allows not only to determine the spray average development in terms of its geometric characteristics, but also to analyse in detail its internal structure. In particular, a suitable elaboration allowed the evaluation of the probability of presence in space of spray liquid fractions.

Experimental Comparison Between Conventional and Bio-Derived Fuels Sprays from a Common Rail Injection System

GRIMALDI, Carlo Nazareno;POSTRIOTI, Lucio
2000

Abstract

In the present study, a commercial high pressure, common rail injection system for automotive DI diesel engines was fed with a conventional diesel fuel, a bio-derived fuel and a blend of them. The comparison of spray characteristics was carried out in terms of tip penetration and cone angles; the fuel spray, generated by rail pressures ranging from 60 MPa to 120 MPa, developed in an atmospheric chamber. The experimental set-up is based on a laser sheet technique. The radiation scattered by the spray, generated by a Nd Yag pulsed laser, is collected by a CCD camera and fed to a frame grabber. A suitably set up automatic image analysis process allows not only to determine the spray average development in terms of its geometric characteristics, but also to analyse in detail its internal structure. In particular, a suitable elaboration allowed the evaluation of the probability of presence in space of spray liquid fractions.
2000
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/925372
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