The high level of biofuels kinematic viscosity could cause some sort of
resistance of fuel flow during fuel injection, affecting the spray geometry and
thus the atomization process.
Kinematic viscosity value highly effect spray geometry such as
penetration and cone angle. Straight Vegetable Oil (SVO) spray penetration is
shortest and with narrow cone angle compared with Biodiesel Fuel (BDF) and Diesel
Fuel (DF) spray. These are due to the high level of kinematic viscosity of SVO
compared to BDF and DF fuel.
High injection pressure spray is improved in SVO fuel penetration length
and development of structures like branches along spray boundary. High
injection pressure spray also produces relatively small-size droplets and could
improve atomization process for SVO spray.
SVO spray at high ambient temperature produce similar spray structures
as DF spray due to kinematic viscosity level of SVO decreased with increased of
fuel temperature. High ambient temperature spray produce smaller droplets size
that could promoteatomization but slower vaporization compared to DF fuel cause
increase of emission when running in low load engine.
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