This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Evaluation of Geometry-Dependent Spray Hole Individual Mass Flow Rates of Multi-Hole High-Pressure GDI-Injectors Utilizing a Novel Measurement Setup
Technical Paper
2020-01-2123
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
In order to optimize spray layouts of commonly used high-pressure injectors for gasoline direct injection (GDI) engines featuring multi-hole valve seats, a detailed understanding of the cause-effect relation between inner spray hole geometries and inner flow conditions, initializing the process of internal mixture formation, is needed. Therefore, a novel measurement setup, capable of determining spray hole individual mass flow rates, is introduced and discussed. To prove its feasibility, a 2-hole configuration is chosen. The injected fuel quantities are separated mechanically and guided to separate pressure tight measurement chambers. Each measurement chamber allows for time resolved mass flow rate measurements based on the HDA measurement principle (German: “Hydraulisches Druck-Anstiegsverfahren”). The setup is utilized for a systematic parameter study, comprising four almost identical generic real-size GDI-injector variants, where one spray hole per variant is subject to a diameter variation. To evaluate the influence of different spray hole diameter ratios, injection pressures and back pressures on the resulting internal flow conditions and the relative mass flow rates between both spray holes, two data reduction schemes are presented. The chosen pressure boundary conditions allow the investigation of the transition from unchoked to choked flow conditions. Consistent onsets of choked flow conditions can be observed for both spray holes of all injector variants, leading the conclusion that the occurrence of choked flow is not affected by the spray hole diameter. A close correlation between the relative mass flow rates and the ratio of spray hole cross sectional areas can be observed throughout all injector variants and internal flow conditions. The influence of spray hole diameter outweighs the influence of varying discharge coefficients. The results prove the capability of the introduced measurement setup in terms of individually characterizing the internal flow conditions in each spray hole and evaluating relative mass flow rates with high reproducibility.
Recommended Content
Authors
Citation
Miller, M., Kuhnhenn, M., Samerski, I., Lamanna, G. et al., "Evaluation of Geometry-Dependent Spray Hole Individual Mass Flow Rates of Multi-Hole High-Pressure GDI-Injectors Utilizing a Novel Measurement Setup," SAE Technical Paper 2020-01-2123, 2020, https://doi.org/10.4271/2020-01-2123.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 |
Also In
References
- Cavicchi , A. , Postrioti , L. , Berni , F. , Fontanesi , S. , and Di Gioia , R. Evaluation of Hole-Specific Injection Rate Based on Momentum Flux Measurement in GDI Systems Fuel 236 116657 2020 10.1016/j.fuel.2019.116657
- Duke , D. , Kastengren , A. , Matusik , K. , Swantek , A. et al. Internal and Near Nozzle Measurements of Engine Combustion Network “Spray G” Gasoline Direct Injectors Exp. Therm Fluid Sci 88 608–6 21 2017 10.1016/j.expthermflusci.2017.07.015
- Payri , R. , Salvador , F.J. , Gimeno , J. , and Venegas , O. Study of Cavitation Phenomenon Using Different Fuels in a Transparent Nozzle by Hydraulic Characterization and Visualization Exp. Therm Fluid Sci. 44 235–2 44 2013 10.1016/j.expthermflusci.2012.06.013
- Walther , J. 2002
- Desantes , J. , Payri , R. , Salvador , F.J. , and Gimeno , J. Different Measurement Techniques to Determine Hole to Hole Dispersion in a Real Diesel Injector ASME Joint U.S. European Fluids Engineering Summer Meeting 2006 10.1115/FEDSM2006-98212
- Wu , Z. , Zhao , W. , Li , Z. , Deng , J. et al. A Review of Engine Fuel Injection Studies Using Synchrotron Radiation X ray Imaging Automot. Innov. 2 79–9 2 2019 10.1007/s42154-019-00056-2
- Römisch , H. 10.1007/978-3-658-28156-4
- Mariani , A. , Cavicchi , A. , Postrioti , L. , and Ungaro , C. A Methodology for the Estimation of Hole-to-Hole Injected Mass Based on Spray Momentum Flux Measurement SAE Technical Paper 2017-01-0823 2017 https://doi.org/10.4271/2017-01-0823
- Li , X. , Cheng , Y. , Ji , S. , Yang , X. , and Wang , L. Sensitivity Analysis of Fuel Injection Characteristics of GDI Injector to Injector Nozzle Diameter Energies 12 434 2019 10.3390/en12030434
- Dahlander , P. , Iemmolo , D. , and Tong , Y. Measurements of Time-Resolved Mass Injection Rates for a Multi-Hole and an Outward Opening Piezo GDI Injector SAE Technical Paper 2015-01-0929 2015 https://doi.org/10.4271/2015-01-0929
- Zeuch , W. Neue Verfahren Zur Messung des Einspritzgesetzes und der Einspritz-RegelmaBigkeit von Diesel-Einspritzpumpen MTZ 9 1961
- Kuhn , U. 2004
- Payri , R. , Salvador , F.J. , Gimeno , J. de la Morena , J. Study of Cavitation Phenomena Based on a Technique for Visualizing Bubbles in a Liquid Pressurized Chamber Int. J. Heat Fluid Flow 30 768–7 77 2009 10.1016/j.ijheatfluidflow.2009.03.011
- Knorsch , T. , Rogler , P. , Miller , M. , and Wiese , W. On the Evaluation Methods for Systematic Further Development of Direct-Injection Nozzles SAE Technical Paper 2016-01-2200 2016 https://doi.org/10.4271/2016-01-2200
- Nurick , W.H. Orifice Cavitation and Its Effect on Spray Mixing J. Fluids Eng. 89 4 681–6 87 1976 10.1115/1.3448452
- National Institute of Standards and Technology https://webbook.nist.gov/chemistry/fluid/