Abstract
A new twin-fluid injector applicable to a single-point injector for gasoline engine was developed. Using this injector's transient spray characteristics, the mixing mechanism of spray particles and the deposition mechanism on the inner wall of an intake manifold were investigated. The measurements of spray particle sizes, velocities and deposition rates were experimentally conducted in a pulsating air flow. The particle deposition takes place due to the particle inertia at high air flow rates. At low air flow rates it comes due to the recirculation appearing on the inner wall at the entrance of the intake manifold. On the other hand, the deposition rate of spray particles is strongly influenced by air pulsation. The behavior of spray particle is mainly influenced by air pulsation when the velocity of the atomizing air is low and when the velocity of the air flow around the injector is high. Single small particles follow the air flow more easily than large particles, and this causes the spatial particle size distribution in the spray clump. As the spray particles approach to the tip of a spray clump, the size of particles.
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Abbreviations
- C :
-
number density of spray particles
- \(\bar d_{32} \) :
-
Sauter's mean diameter
- h :
-
distance from injector to measuring point along center axis of test section
- N :
-
rotational speed of butterfly valve
- P o :
-
absolute pressure in test section
- q :
-
volumetric flow rate of liquid per stroke
- r :
-
radial distance from center axis
- R d :
-
deposition rate of spray particles
- t d :
-
elapsed time since input of fuel injection pulse
- t e :
-
width of the electric injection pulse
- V a :
-
air velocity
- V p :
-
spray particle velocity
- W a :
-
flow rate of air flowing around injector
- W ∞ :
-
flow rate of atomizing air
- θ:
-
crank angle
- θ ph :
-
injection timing in terms of crank angle
References
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Oh, Y.T., Inamura, T. Intermittent airblast atomization and spray particle mixing in pulsating air flow. KSME Journal 9, 483–491 (1995). https://doi.org/10.1007/BF02953646
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DOI: https://doi.org/10.1007/BF02953646