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D ual-fuel gas-Diesel engines

Project leader: Prof. Ingemar Denbratt PhD student: Zhiqin Jia Project start date : 30 Oct 2012 Project end date: 31 Dec 2014 Program: Energy Efficient Road Vehicles Project funding: 3 638 000 SEK. D ual-fuel gas-Diesel engines. Outline. Background & goals Experimental setup

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D ual-fuel gas-Diesel engines

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  1. Project leader: Prof. Ingemar Denbratt PhD student: Zhiqin Jia Project start date: 30 Oct 2012 Project end date: 31Dec 2014 Program: Energy Efficient Road Vehicles Project funding: 3 638 000 SEK Dual-fuel gas-Diesel engines

  2. Outline • Background & goals • Experimental setup • Methodology • Results • Conclusion & futurework

  3. Background • Research regarding conventional NG-Diesel dual-fuel combustion have already continuously been conducted several decades (NG mass ratio, total lambda, pilot Diesel quantity influence, etc). • Dual-fuel RCCI (ReactivityControlled CompressionIgnition) combustionconcept gives quitepromisingresults (efficiency and emission). • There is a need for dual-fuel 3D modelstohelptooptimise dual-fuel experimental hardware and understand moreaboutcombustiondetails. Roussos G. Papagiannakis, ”Combustion and performancecharacteristicsof a DI diesel engine operating from lowtohighnatural gas supplmentratio”, SAE Technical Paper:2008-01-1392. Derek E. Nieman and Rolf D.Reitz, ”Heavy-duty RCCI operation usingnatural gas and diesel”, SAE Technical Paper: 2012-01-0379.

  4. Goals • Investigate dual-fuel (NG/Diesel) RCCI fast combustion on a heavy duty DI Diesel engine. • Validate Chalmers developed dual-fuel combustion 3D simulation model with experimental data.

  5. AVL AMA NO. NOx. HC. CO. CO2 Experimental setup Volvo D12C single cylinder engine

  6. Methodology Diesel injectionprofile (electrical signal) SOI=64.5 - 74.2 BTDC SOI =45 BTDC

  7. Results – RCCI combustion 9 bar BMEP, 1500 rpm, injectionpressure 1000 bar, 41% EGR 4.05 CAD 3.69 CAD SOI=69.3 BTDC SOI=45 BTDC

  8. Results – RCCI combustion 9 bar BMEP, 1200 rpm, injectionpressure 1000 bar, 41% EGR 2.16 – 4.32 CAD 2.88 CAD SOI=64.5 BTDC SOI=45 BTDC

  9. Results – simulation

  10. 80 60 350 300 Total heat release rate (J/deg) [bar] In-cylinder pressure [bar] Results – simulation 250 40 200 150 20 100 50 0 0 90 70 80 -30 -20 -10 0 10 20 30 40 50 60 -60 -30 -90 0 30 60 90 120 -120 Crank angle [°ATDC] Crank angle [°ATDC] 500 Exp Calc Exp Calc 450 400

  11. Conclusions & Future work • It has been shown that RCCI combustion can be obtained and controlled for mixtures of NG and Diesel. • It is possibletoreachveryhighthermalefficiency and low NOx and Soot emissions. • Resonable goodagreementbetweenthe experimental data and 3D simulation modelhavebeenachieved, butchemicalmechanismneedsto be furtherimproved. • We plan to investigate direct injection of both gas and Diesel.

  12. Thank you for your attention

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