Size-Classified Droplet Dynamics and its Slip Velocity Variation of Air-Assist Injector Spray

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

“…To investigate the droplet size and velocity distribution in the near nozzle region of the spray using HiDense PDA system, measurement points were selected at an interval of 0.5 mm in the radial direction and 2 mm in the axial direction. Size-classified technique was applied to obtain a detailed knowledge of the dynamics by distributing the droplets into several size classes [30][31][32][33][34]. The size-classified data analysis is one of the options to interpolate the physics of droplets.…”

SC4-1: Spray Behavior near the Nozzle of a DISI Multi-Hole Injector Using Phase Doppler Anemometer(SC: Spray and Spray Combustion,General Session Papers)

“…Size classified technique [11][12][13][14] In order to investigate the atomization process, in /a (1) Where, p. is the air density, o is the surface tension, Vli is the airflow velocity and Dp and Pl, are the average droplet diameter and velocity fbr each size. Weber number is defined as the ratio of the inertia force to the surface tension force.…”

“…Figures Il and 12 show the effect of the iajection pressure on the spray droplet size and velocity at diffbrent axial positions. In Figure 11 the results reveal a considerable increase in droplet velocity at elevated miection pressures at different axial positions of the spray.…”

Multi-intensity-layer particle-image velocimetry for spray measurement

“…The PIV measurement was carried out on an air-assisted petrol injector that has been analysed by us [20,21]. This air-assisted injector was designed for a two-stroke marine engine in order to reduce the amount of hydrocarbon that remained unburned and prevent misfiring [19][20][21][22].…”

“…The purpose of this study is to develop a new dataanalysis method for PIV which is based on information of various intensities in a measurement plane, that is, a multiple layer classified in terms of the light intensity scattered by the droplet (multi-intensity-layer images). Feasibility studies on this application of PIV for fuel-injector measurement were carried out [19][20][21], in which small fuel droplets followed turbulent eddies, while large droplets penetrated straight through the recirculating flow region due to their large momentum. The dynamics of droplets of various sizes were observed even in a small region.…”