Optical Characterization of PFI Gasoline Sprays: Effect of Injection Pressure Indian Institute of Science

Format:

Conference/Event

Author/Creator:

T. N. C., T. N. C., author.

Contributor:

Avulapati, Madan Mohan

Deshmukh, Devendra

Rayavarapu, Ravikrishna

Conference Name:

Small Engine Technology Conference & Exposition (2010-09-28 : Linz, Austria)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

In the present study, PFI injectors which are suitable for smallengines were characterized to study the effect of pressure onvarious spray parameters. Two plate-type PFI injectors werestudied: one with two orifices, and the other with four orifices.The nozzle orifice sizes were determined by microscopy. The fuelquantity injected at pressures of 200 kPa, 500 kPa and 800 kPa,were measured by collecting the fuel, for injection pulses ofdifferent durations.The spray structure of the PFI sprays was determined byshadowgraphy. A single pulsed Nd:YAG laser in conjunction withfluorescent diffuser optics was used as the light source forshadowgraphy. Backlit images of the spray were obtained at varioustimes after the start of injection using a CCD camera. This wasdone for sprays at different pressures, and different pulsedurations. The spray angle, and spray tip penetration weredetermined from the processed shadowgraphy images. The backlitimages also showed insights into the development of the spray. Itwas observed that coalescence occurs, with liquid from the orificesmerging early on to form a single core.Droplet sizes were determined at various times after the startof injection. Shadowgraphy on small regions of the spray (~ 1.4 mmx 2.5 mm) was performed with backlighting with a pulsed laser anddye plates, and a long focal length microscope attached to a CCDcamera. The droplet size distributions and variation of Sauter meandiameter (SMD) with time were determined at different pressures andspray durations. The SMDs were found to reduce significantly whenthe pressure was changed from 200 kPa to 800 kPa, with valuesdropping from around 140-180 micron to around 80-100 micron. The4-hole injector was found to give smaller droplet sizes than thetwo-hole injector at the same injection pressures

Notes:

Vendor supplied data

Publisher Number:

2010-32-0067

Access Restriction:

Restricted for use by site license