Effects of Internal Geometry on High-Pressure Gasoline Sprays using High-Speed Imaging University of Michigan

Format:

Book

Conference/Event

Author/Creator:

Medina, Mario Omar, author.

Contributor:

Fatouraie, Mohammad

Wooldridge, Margaret

Zhou, Yichen

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

High-pressure gasoline injection can be utilized for improved combustion efficiency and lower engine-out emissions. The objective of this study was to quantify the effects of injector geometry on high-pressure gasoline transient spray development in a constant volume chamber. Five injector nozzles were studied with controlled internal flow features including differences in inlet rounding, conicity, and outlet diameter. Effects of fuel injection pressure and chamber density on the spray characteristics were investigated. Reference grade gasoline was injected at pressures of 300, 600, 900, 1200, and 1500 bar. The chamber density was varied with pressurized nitrogen at 1, 5, 10 and 20 bar at a constant temperature of 298 K, corresponding to ambient densities of 1.13, 5.65, 11.31, and 22.61 kg/m3. The spray development was recorded using diffuse backlit shadowgraph and high-speed imaging methods. The results extracted to describe the spray development include spray tip penetration distance, spray tip penetration rate, and cone angle. The results are divided into two major sections. First, a comparison of the effects of operating conditions for each of the injector variants. The trends show the spray development for each injector configuration behaves similarly as previously observed as a function of the different operating conditions. Early portion penetration rate differed by 47% at lower injection pressure but decreased to 15% at higher injection pressures. Second, the spray development was compared between the injector geometry variants. The results indicate that for certain combinations of inlet rounding, conicity, and outlet diameter the spray has simultaneously higher penetration distance, rates and cone angles; indicating that for the same operating conditions a nozzle with the same internal features but different diameter would yield higher mass flow rates. For example, injector B nozzle 2 consistently shows higher penetration rates by ~25 m/s and higher cone angles by 4° compared to Injector B nozzle 1

Notes:

Vendor supplied data

Publisher Number:

2020-01-2111

Access Restriction:

Restricted for use by site license