KTH ROYAL INSTITUTE OF TECHNOLOGY Dual-fuel combustion for the introduction of renewable alcohol fuels in heavy-duty diesel engines Nicola Giramondi Prof. Anders Christiansen Erlandsson (KTH) Dr. Anders Westlund (Scania), Prof. Mihai Mihaescu (KTH)
Project overview Title: Dual-fuel combustion for the introduction of renewable alcohol fuels in heavy-duty diesel engines Timeline: August 2016 Fall 2020 Research Program: Fordonsstrategisk Forskning och Innovation (FFI) Project partners: 2017-10-10 2
Summary Project motivation Research questions Research methodology Project status and plan 2017-10-10 3
Project motivation Diesel pilot-ignited alcohol direct injection in heavy-duty engines 2017-10-10 4
Motivation Controllability (Injection strategy) Indicated efficiency Alcohol-Diesel Direct Injection Diffusion combustion (At high loads) Oxygen content Heat of vaporization ( In-cylinder peak temperature) Cycle-to-cycle variations UHC, soot NOx References: Boretti (2012); Haraldson (2014); Gao et al. (2013); Sarjovaara, Alantie and Larmi (2013); Zheng, Li and Han (2015). 2017-10-10 5
Dual-fuel engine for marine applications Reference: Haraldson, 2014 Wärtsilä methanol-diesel concept Mixing-controlled combustion 2017-10-10 6
Research questions Injection system geometry and injection strategy 2017-10-10 7
Dual-fuel injection system prototype Design of the dual-fuel injection system 2017-10-10 8
Injection system geometry Influence of the geometrical parameters of the injection system on: Ignition timing, combustion phasing Ignition and combustion characteristics Alcohol-diesel spray-spray interaction Heat release rate Degree of premixing Liquid penetration Local equivalence ratio Temperature field With different injection strategies 2017-10-10 9
Injection strategy Ignition timing, combustion phasing Heat release rate Influence of the injection strategy: Performance Emissions Indicated efficiency UHC, CO, NOx, soot Combustion variability COV of IMEP, misfire At low and high loads With respect to a pure diesel baseline 2017-10-10 10
Research methodology Coupling CFD simulation and single-cylinder engine testing 2017-10-10 11
Tools and methods Combustion simulation Metal engine testing CFD method development + Injection system pre-design Sweeping: Nozzle geometry and injection strategy Targeting: Ignition and combustion characteristics Prototype testing Sweeping: Nozzle geometry and injection strategy Targeting: Emissions, performance and combustion variability Combustion simulation CFD method validation Optical engine testing Combustion optical diagnostics Targeting: Ignition characteristics + Spray-spray interaction 2017-10-10 12
Project status and plan 2017-10-10 13
Project status and plan Accomplishments Research questions Injection system design Preliminary CFD simulation campaign Combustion simulation method MATLAB post-processing tools On-going work Experimental system set-up CFD method refinement CFD simulation campaign Near-future work Publication of CFD results Experimental campaign Publication of experimental results CFD method validation 2017-10-10 14
Thanks for your attention! 2017-10-10 15
References Boretti, A. (2012) Advantages of converting Diesel engines to run as dual fuel ethanol-diesel, Applied Thermal Engineering. Elsevier Ltd, 47, pp. 1 9. doi: 10.1016/j.applthermaleng.2012.04.037. Haraldson, L. (2014) IEA BIOENERGY AND AMF WORKSHOP HEAVY DUTY ENGINES [PowerPoint Slides] Available from http://www.ieabioenergy.com/wpcontent/uploads/2014/05/p10-heavy-duty-engines-haraldson.pdf Gao, T. Y. et al. (2012) An Enabling Study of Low Temperature Combustion with Ethanol in a Diesel Engine, Proceedings of the Asme Internal Combustion Engine Division Fall Technical Conference - 2012, 135(December), pp. 217 226. doi: 10.1115/1.4024027. Sarjovaara, T., Alantie, J. and Larmi, M. (2013) Ethanol dual-fuel combustion concept on heavy duty engine, Energy. Elsevier Ltd, 63(x), pp. 76 85. doi: 10.1016/j.energy.2013.10.053. Zheng, M., Li, T. and Han, X. (2015) Direct injection of neat n-butanol for enabling clean low temperature combustion in a modern diesel engine, Fuel. Elsevier Ltd, 142, pp. 28 37. doi: 10.1016/j.fuel.2014.10.075. 2017-10-10 16