Optical study on needle lift and its effects on reacting diesel sprays of a single-hole solenoid injector
2020
Precise control of needle lift provides one possibility to control the Diesel
spray and combustion process actively. However, most studies of needle lift
focus on internal flow or near nozzle spray. Little work has been performed
on its effects on reacting spray. In this work, one way to change the needle
lift profile of a solenoid injector has been developed and the relationship
between needle lift and reacting spray has been investigated. The needle
movement was detected with an optical nozzle. In addition, the visualization
of reacting sprays of the same injector equipped with a single-hole nozzle
was conducted in a combustion chamber. Some simulations were also performed
to assist the analysis. The results show that the needle lift profile can be
regulated by changing the thickness of an adjusting pad. It seems the
different needle lift profiles do not bring in significant influences on
reacting spray characteristics. The CFD results indicate that it is mainly
caused by the similar internal flow characteristics which do not show strong
variation when needle lift is higher than 0.1 mm. However, the discharge
coefficient and velocity coefficient decrease sharply when needle lift is
smaller than 0.05 mm because of the “throttle” effect.
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