This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
GDI Sprays with up to 200 MPa Fuel Pressure and Comparison of Diesel-like and Gasoline-Like Injector Designs
Technical Paper
2020-01-2104
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
To address stricter emission limits, GDI develops to increased fuel pressure. Current gasoline injectors are already operating at a pressure of up to 35 MPa and an elevation is still promising lower particle emissions and increased efficiency. There have been only few studies of GDI sprays at pressures >50 MPa published. Contrary, in diesel engines injection pressure up to 250 MPa are common. GDI and diesel injector designs limit liquid penetration in different ways to avoid wall wetting, which has a negative impact on emissions in GDI combustion concepts. With elevated fuel pressure the question arises which design concept limits the penetration depth more effectively. To investigate the properties of high pressure sprays, a GDI injector (100 MPa max. fuel pressure) and an injector with diesel-like design are compared. High speed Shadowgraphy and Schlieren technique are used to gather information of liquid and vapor phase propagation. With Phase-Doppler-Anemometry (PDA) the diameter and the velocity of droplets in the sprays are recorded. Measurements are executed in a spray bomb with ambient pressure up to 4 MPa and ambient temperature up to 660 K. Results show that, increased fuel pressure lowers the mean and maximum diameter of the droplets. At the same time, considering ambient conditions, the spray penetration is not always higher at higher pressures, despite higher spray velocities. The injector design affects the penetration depth and the transition to the vapor phase, due to different rates of air entrainment. At higher fuel pressures the diesel design leads to faster vaporization, therefore the mixture formation and phase change are also faster, especially in high temperature ambient conditions. While a typical GDI design limits penetration more efficiently at moderate injection pressures and in low to moderate ambient conditions, the situation changes for very high injection pressure >50 MPa and late injection timing.
Recommended Content
Authors
Topic
Citation
Lehnert, B., Conrad, C., and Wensing, M., "GDI Sprays with up to 200 MPa Fuel Pressure and Comparison of Diesel-like and Gasoline-Like Injector Designs," SAE Technical Paper 2020-01-2104, 2020, https://doi.org/10.4271/2020-01-2104.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 |
Also In
References
- Hoffmann , G. , Befrui , B. , Berndorfer , A. , Piock , W.F. et al. Fuel System Pressure Increase for Enhanced Performance of GDi Multi-Hole Injection Systems SAE Int. J. Engines 7 1 519 527 2014 https://doi.org/10.4271/2014-01-1209
- Peer , J. , Backes , F. , Sauerland , H. , Härtl , M. et al. Development of a High Turbulence, Low Particle Number, High Injection Pressure Gasoline Direct Injection Combustion System SAE Int. J. Engines 9 4 2301 2311 2016 https://doi.org/10.4271/2016-01-9046
- Yamaguchi , A. , Koopmans , L. , Helmantel , A. , Karrholm , F.P. et al. SAE Technical Paper Series Warrendale, PA United States 2019
- Tian , J. , Zhao , M. , Long , W. , Nishida , K. et al. Experimental Study on Spray Characteristics Under Ultra-High Injection Pressure for DISI Engines Fuel 186 365 374 2016 10.1016/j.fuel.2016.08.086
- Medina , M. , Fatouraie , M. , and Wooldridge , M. SAE Technical Paper Series Warrendale, PA United States 2018
- Payri , R. , García , A. , Domenech , V. , Durrett , R. et al. An Experimental Study of Gasoline Effects on Injection Rate, Momentum Flux and Spray Characteristics Using a Common Rail Diesel Injection System Fuel 97 390 399 2012 10.1016/j.fuel.2011.11.065
- Wetzel , J. Optical Analysis of the Influence of Injector Hole Geometry on Mixture Formation in Gasoline Direct Injection Engines Automot. Engine Technol. 1 1-4 57 67 2016 10.1007/s41104-016-0005-1
- Reitz , R.D. , and Bracco , F.B. SAE Technical Paper Series Warrendale, PA United States 1979
- Khuong , L.S. , Masjuki , H.H. , Zulkifli , N.W.M. , Mohamad , E.N. et al. Effect of Gasoline-Bioethanol Blends on the Properties and Lubrication Characteristics of Commercial Engine Oil RSC Adv. 7 25 15005 15019 2017 10.1039/c7ra00357a
- Kheiralla , M.M.E.-A. , Hassan , M.Y. , and Hussen , M.A. ICMAR’2012 2012
- Bornschlegel , S. , Conrad , C. , Durst , A. , Welss , R. et al. The Influence of Superheated Injection on Liquid and Gaseous Flow Field of an Experimental Single-Hole Gasoline Direct Injection Injector International Journal of Engine Research 2019 10.1177/1468087419858464
- Durst , A. , Wensing , M. , and Berrocal , E. Light sheet Fluorescence Microscopic Imaging for the Primary Breakup of Diesel and Gasoline Sprays with Real-World Fuels Applied Optics 57 10 2704 2714 2018 10.1364/AO.57.002704