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A traditional two stroke engine with crankcase scavenging also adopting an exhaust reed valve and lamellar intake is modified to accommodate a high pressure Compressed Natural Gas (CNG) direct injector and has the traditional spark plug replaced by a jet ignition device of the same thread. The jet ignition device is a pre-chamber accommodating a Gasoline Direct Injection (GDI) injector operated with CNG and an 8 mm racing spark plug. The jet ignition pre-chamber is connected to the main chamber through calibrated orifices. The CNG is injected after the exhaust post closes. The GDI injector operated with CNG introduces a slightly rich amount of fuel in the pre-chamber. The spark plug discharge initiates the pre-chamber combustion that then propagates to the main chamber though multiple jets of high energy partially burned hot combustion products that quickly ignite the main chamber mixtures. The Computer Aided Design (CAD) model of the engine including the jet ignition device is discussed in detail. The Computer Aided Engineering (CAE) model of the engine is shown to produce efficiencies well in excess of 35% in the area of best operation. The load is controlled by fine tuning the injection and ignition events and increasing the overall air-fuel ratio. The solution offers an opportunity to produce an efficient alternative to four stroke engines with improved power density, running on alternative fuel having larger availability and better combustion properties and reduced pollution than traditional diesel and gasoline fuels.
Czasopismo
Rocznik
Tom
Strony
145–--152
Opis fizyczny
Bibliogr. 12 poz., rys., tab., wykr.
Twórcy
autor
- RMIT University, Po Box 71, Bundoora, 3383 VIC, Australia
autor
- RMIT University, Po Box 71, Bundoora, 3383 VIC, Australia
Bibliografia
- [1] Yamaha, Two Stroke HPDI (2013). URL www.yamahaoutboards.com/outboards/ 2-Stroke-HPDI/overview
- [2] Rotax, E-TEC 800 R (2013). URL www.brp-powertrain.com/en/desktopdefault. aspx/tabid-235/374_read-355/
- [3] Rotax, E-TEC 600 R (2013). URL www.brp-powertrain.com/en/desktopdefault.aspx/tabid-232/371_read-349/
- [4] TUM, Investigation of a novel pre-chamber concept to improve ignition and combustion of lean premixed natural-gas-air mixtures in gas motors (2013). URL www.td.mw.tum.de/tum-td/en/de/forschung/ themen/pgi_gasmotor
- [5] CIMAC, Recent Developments in 4 Stroke Engines (2006). URL www.cimac.com/cimac_cms/uploads/explorer /events_2006/6_Developments_in_4_Stroke_ Diesel_Engines_Niven_Nerheim.pdf
- [6] A. A. Boretti, H. C. Watson, Enhanced combustion by jet ignition in a turbocharged cryogenic port fuel injected hydrogen engine, Int J Hydrogen Energy 34 (5) (2009) 2511–2516.
- [7] A. A. Boretti, H. C.Watson, The lean burn direct injection jet ignition gas engine, Int J Hydrogen Energy 34 (18) (2009) 7835–7841.
- [8] A. A. Boretti, Stochastic reactor modelling of multi modes combustion with diesel direct injection or hydrogen jet ignition start of combustion, Int J Hydrogen Energy 37 (18) (2012) 13555–13563.
- [9] B. Fleck, R. Fleck, R. J. Kee, X. Hu, L. Foley, I. Yavuz, CFD Simulation and Validation of the Scavenging Process in a 125cc 2-Stroke Racing Engine., SAE P.2006-32-0061 (2006). Journal of Power Technologies 94 (3) (2014) 145–152
- [10] AVL, BOOST - Advanced Engine Cycle, After treatment Fuel Injection and Duct Acoustic Simulation (2013). URL www.avl.com/boost1
- [11] Ricardo, WAVE (2013). URL www.ricardo.com/en-GB/What-we-do/Software /Products/WAVE/
- [12] Orbital, Intellectual Property / FlexDI (2013). URL www.orbeng.com.au/intellectual-propertyflexdi.html
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-1a4e4ca8-03ed-4613-ac99-6738673d452e