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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.90
pages 98-110

Intermittent Airblast Atomization and Spray Particle Mixing in Pulsating air Flow

T. Inamura
Department of Aeronautics and Space Engineering, Tohoku University, Sendai, Japan
Nobuki Nagai
Department of Aeronautics and Space Engineering, Tohoku University, Aramaki Aza Aoba, Aoba-ku, Sendai, Japan
K. Inokuchi
Department of Aeronautics and Space Engineering, Tohoku University, Sendai, Japan
Yo. T. Oh
Department of Mechanical Engineering, Chon Buk National University, Chonju, Korea

ABSTRACT

A new twin-fluid injector applicable to single-point injector for gasoline engine was developed. Transient spray characteristics, mixing mechanism of spray particles and the deposition mechanism on the inner wall of the intake manifold were investigated.
Spray formation by the newly developed single-point injector and the measurements of spray particle sizes, velocities and deposition rates have been conducted in a pulsating air flow. Experiments have been carried out under cold flow condition.
The particle deposition takes place due to particle inertia at high air flow rate. At low air flow rate it takes place clue to the recirculation which appears on the inner wall at the entrance of an intake manifold. On the other hand, the deposition rate of spray particles is strongly influenced by air pulsation. The behavior of spray particle is influenced by the air pulsation at the low velocity of atomizing air and at high velocity of the air flowing around the injector. The 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 particle approaches to the tip of spray clump, the particle size decreases.


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