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Effect of Partial Needle Lift on the Nozzle Flow in Diesel Fuel Injectors
Technical Paper
2011-01-1827
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An experimental study has been performed to evaluate the impact
of different needle partial lifts on the nozzle orifices flow. A
prototype injector with a multi-orifice nozzle was used. This
injector allows controlling the needle lift at different
percentages of maximum lift. Different measures of mass flow rate
and spray momentum flow at several rail pressures (up to 200 MPa)
were made in order to observe the effect of different needle lift
percentages on the amount of fuel injected and momentum of the
jet.
The influence of partial needle lifts on nozzle orifices flow
was estimated by using non-dimensional parameters of discharge
coefficient (Cd), velocity coefficient (Cv)
and area coefficient (Ca). The results show an
interesting reduction in nozzle discharge coefficient at partial
lift. This reduction of Cd value at partial needle lift
is not only due to the drop in the velocity coefficient but also to
a reduction of the effective orifice area. This decrease in the
area coefficient (Ca) at partial lift compare with the
value at full needle lift evidences that the flow through the
nozzle orifices is not controlled only by the pressure at the inlet
of the orifices but also by the velocity profiles at the inlet of
the orifice, which is frequently neglected in the numerical
calculations.
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Citation
Payri, R., Gimeno, J., Venegas, O., and Plazas, A., "Effect of Partial Needle Lift on the Nozzle Flow in Diesel Fuel Injectors," SAE Technical Paper 2011-01-1827, 2011, https://doi.org/10.4271/2011-01-1827.Also In
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