Effects of injection parameters on the spray characteristics of swirl and slit injectors using the Mie-scattering method

• Published in: International journal of automotive technology Vol. 11; no. 3; pp. 435 - 440
• Main Authors: Lee, C. H., Lee, K. H., Lim, K. B.
• Format: Journal Article
• Language: English
• Published: Heidelberg The Korean Society of Automotive Engineers 01.06.2010; Springer Nature B.V; 한국자동차공학회
• Subjects: Automobile engines; Automobiles; Automotive Engineering; Energy consumption; Engineering; Engines; Fluid flow; Injectors; International; Investigations; Lasers; Pressure; Slits; Spray characteristics; Sprayers; Sprays; Studies; Systems design; Turbulent flow; Velocity; Vortices; 자동차공학; Turbulence occurring point; ); Deceleration point; Direct injection spark ignition (DISI); Velocity coefficient (C
• ISSN: 1229-9138; 1976-3832
• DOI: 10.1007/s12239-010-0053-x

We investigated the effects of injection parameters such as injection pressure, ambient pressure, and ambient temperature on spray characteristics. We calculated the turbulence occurring point ( t c ), defined as the time required to generate a vortex, and the deceleration point ( t b ), defined as the time when spray penetration begins to decelerate, to elucidate the breakup mechanism of the test injectors. The spray velocity coefficient (C v ) was obtained to evaluate the spray characteristics. As the ambient pressure increases in the case of a slit injector, C v decreases. We investigated the effects of nozzle tip shape according to injection pressure, ambient pressure, and fuel properties on spray characteristics and provide a C v value of 0.38 for the swirl injector with a spray angle of 60° and the slit injector under atmospheric conditions. The value of C v in the case of a slit injector was reduced by increasing the ambient pressure. Our results suggest that C v of a swirl injector is constant regardless of changes in ambient pressure, injection pressure, and fuel properties. On the other hand, C v of a slit injector is altered by changes in ambient pressure.