The Effect of Fuel-Line Pressure Perturbation on the Spray Atomization Characteristics of Automotive Port Fuel Injectors

Zhao, Fuquan; Amer, Amer Ahmad; Lai, Ming Chia; Dressler, John L.

doi:10.4271/952486

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…The spray angle was found to vary both with time and with axial distance from the injector tip, and with the technique used. Zhao et al [4] obtained backlit images and PDA measurements on baseline and pressure modulated PFI injectors, and obtained SMD and droplet distribution and velocity data. For the baseline case, the SMD was found to be between 160 and 190 micron for different injectors.…”

Section: Introductionmentioning

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: Introductionmentioning

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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The Spray Structure of Air-Shrouded Dual-Stream Port Fuel Injectors With Different Air-Mixing Mechanisms

Zhao

Yoo²,

Lai

1998

Journal of Engineering for Gas Turbines and Power

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An experimental study of the spray structure from air-shrouded dual-stream injectors with different air mixing mechanisms was carried out extensively to understand the spray characteristics of dual-stream port injectors for applications to four-valve gasoline engines. The injectors were tested under both steady and transient conditions at different injection pressures and air shrouding pressure differentials. The global spray structure was visualized using the planar laser Mie scattering technique and spray atomization processes were characterized by the phase-Doppler anemometry method. The experimental results showed that spray atomization characteristics are improved markedly by the air-shrouding technique and also strongly dominated by the air-mixing mechanisms. When the air flows into the injector tip mainly from the radial direction, two streams of the spray are forced to merge together and as a result a single-stream spray is formed. When the radial velocity component of the air is reduced and the air is made to mix well with the fuel inside the injector tip, however, the two streams of the spray are well separated over different injection conditions. Moreover, other spray parameters are also modified by the air shrouded into the injector, which must be optimized in order to achieve the best performance of the air-shrouded injector.

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Optical Characterization of PFI Gasoline Sprays: Effect of Injection Pressure

Anand

Avulapati

Deshmukh

et al. 2010

SAE Technical Paper Series

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The Effect of Fuel-Line Pressure Perturbation on the Spray Atomization Characteristics of Automotive Port Fuel Injectors

Cited by 5 publications

References 21 publications

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

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

The Spray Structure of Air-Shrouded Dual-Stream Port Fuel Injectors With Different Air-Mixing Mechanisms

Optical Characterization of PFI Gasoline Sprays: Effect of Injection Pressure

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