On the intermittent spray characteristics

Kim, Dong-Won; Lee, Sam Goo; Rho, Byung Joon; Kang, Sung Goon

doi:10.1007/bf02945558

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Hence, the spray cone angle in other studies has been found to be often determined by mechanical methods such as collecting the spray using a patternator, and then determining the mass at different locations [22]. Figures 5 to 8 show instantaneous and averaged images of the spray, 8 ms after the start of injection.…”

Section: Pfi Injectorsmentioning

confidence: 99%

Laser-Based Spatio-Temporal Characterisation of Port Fuel Injection (PFI) Sprays

Anand

Deshmukh

Madan

et al. 2010

International Journal of Spray and Combustion Dynamics

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In the present work, detailed laser-based diagnostic experiments were conducted to characterise the spray from low pressure 2-hole and 4-hole Port Fuel Injection (PFI) injectors. The main objective of the work included obtaining quantitative information of the spatio-temporal spray structure of such low-pressure gasoline sprays. A novel approach involving a combination of techniques such as Mie scattering, Granulometry, and Laser Sheet Dropsizing (LSD) was used to study the spray structure. The droplet sizes, distributions with time, Sauter Mean Diameters (SMD), droplet velocities, cone angles and spray tip penetrations of the sprays from the injectors were determined. The spray from these injectors is found to be 'pencil like' and not dispersed as in high pressure sprays. The application of the above mentioned techniques provides two-dimensional SMD contours of the entire spray at different instants of time, with reasonable accuracy.

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Section: Pfi Injectorsmentioning

confidence: 99%

Laser-Based Spatio-Temporal Characterisation of Port Fuel Injection (PFI) Sprays

Anand

Deshmukh

Madan

et al. 2010

International Journal of Spray and Combustion Dynamics

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“…In order to determine the Q for a given geometry and load, however, three-dimensional elastic-plastic finite element analysis, which is time consuming and costly, could not help being performed so far. Kim et al [1] described and compared other methods of measuring stress triaxiality using the displacements near the side necking, proved the validities of these models and studied the effect of location where the displacements are measured using three-dimensional finite element analysis for a standard CT specimen with 20% side-grooves. Kim and Kang [2] examined the applicability of these models to various specimen and materials in detail using the three-dimensional finite element simulation for various specimen geometries.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Measurement of Toughness Locus for a Ductile Material

Kim

Lee²,

Kim³

et al. 2005

KEM

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A toughness locus Jc-Q for a ductile steel, SA106 Grade C used in the main steam piping of nuclear power plants, has been experimentally evaluated. Along with the standard fracture test procedure for J-R curve, Q as the second parameter governing stress triaxiality nearby the crack tip is measured from the displacements nearby the side necking which occurs near the crack tip on the lateral surface of a fracture specimen. The displacements nearby the side necking are measured from the digital images taken during the fracture experiment based on Stereoscopic Digital Photography (SDP) and high resolution Digital Image Correlation (DIC) software. The crack length is monitored by Direct Current Potential Drop (DCPD) method and the J-R curve is determined according to ASTM standard E1737-96. The effects of crack length, specimen geometry and thickness of specimen are studied, which are included in the toughness locus Jc-Q.

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Atomization characteristics in pneumatic counterfiowing internal mixing nozzle

Lee

Rho

2000

KSME International Journal

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In an effort to illustrate the global variation of SMD(Sauter mean diameter, or D32) and AMD (Arithmetic mean diameter, or D lO ) at five axial downstream locations (i. e., at Z=30, 50, 80, 120, and 170 mm) under the different experimental conditions, the radial coordinate is normalized by the spray half-width. Experimental data to analyze the atomization characteristics concerning with an internal mixing type have been obtained using a PDPA (Phase Doppler Particle Analyzer). The air injection pressure was varied from 40 kPa to 120 kPa. In this study, counterflowing internal mixing nozzles manufactured at an angle of 15·with axi-symmetric tangential-drilled four holes have been considered. By comparing the results, it is clearly possible to discern the effects of increasing air pressure, suggesting that the disintegration process is enhanced and finer spray droplets can be obtained under higher air assist. The variations in D 32 are attributed to the characteristic feature of internal mixing nozzle in which the droplets are preferentially ejected downward with strong axial momentum, and dispersed with the larger droplets which are detected in the spray centerline at the near stations and smaller ones are generated due to further subsequent breakup by higher shear stresses at farther axial locations. The poor atomization around the centre close to the nozzle exit is attributed to the fact that the relatively lower rates of spherical particles are detected and these drops are not subject to instantaneous breakup in spite of the strong axial momentum. However, substantial increases in SMD from the central part toward the edge of the spray as they go farther downstream are mainly due to the fact that the relative velocity of droplet is too low to cause any subsequent disintegration.

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On the intermittent spray characteristics

Cited by 4 publications

References 6 publications

Laser-Based Spatio-Temporal Characterisation of Port Fuel Injection (PFI) Sprays

Laser-Based Spatio-Temporal Characterisation of Port Fuel Injection (PFI) Sprays

An Experimental Measurement of Toughness Locus for a Ductile Material

Atomization characteristics in pneumatic counterfiowing internal mixing nozzle

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