Passive scalar interface in a spatially evolving mixing layer (A. Attili and D. Denker)

Quartz nozzle sampling (D. Felsmann)

Dissipation element analysis of a planar diffusion flame (D. Denker)

Turbulent/non-turbulent interface in a temporally evolving jet (D. Denker)

Dissipation elements crossing a flame front (D. Denker and B. Hentschel)

Particle laden flow (E. Varea)

Turbulent flame surface in non-premixed methane jet flame (D. Denker)

DNS of primary break up (M. Bode)

Diffusion flame in a slot Bunsen burner (S. Kruse)

Various quantities in spatially evolving jet diffusion flame (D. Denker)

OH layer in a turbulent wall bounded flame (K. Niemietz)

Development of Advanced Combustion Strategies for Compression Ignition Dual-Fuel Engines (DF-CI)

The worldwide rise in energy demand on the one hand and the concerns about harmful emissions of internal combustion engines (ICE) on the other hand, has led many researchers to focus on alternative fuels as well as on advanced combustion strategies. One approach to address these combined needs is the dual-fuel (DF) concept in combination with compression ignition (CI) combustion. In the DF operation, two fuels with different auto-ignition characteristics are employed. A low-reactivity fuel, e.g. natural gas, is injected in the intake manifold (enabling uniformly mixing with air) and a high-reactivity fuel, e.g. diesel fuel, is directly injected into the combustion chamber (triggering the combustion). With this approach, it is possible to promote a homogeneous mixture, due to increased ignition delay time, which can lead to a simultaneous reduction of nitric oxides (NOx) and particulate matter (PM) emissions.

At ITV, in-cylinder fuel blending based on premixed methane / air-mixture and direct injection of diesel fuel has been investigated. Methane was chosen as a supplement to diesel fuel, due to its benefits like higher knock resistance, cleaner combustion, availability, higher auto-ignition temperature, and lower cetane number in comparison to diesel fuel. Moreover, the different combustion modes, which occur depending on the injection timing of the diesel fuel (early branch and late branch) and their impact on the performance metrics have been analyzed.

ITV has a modified single-cylinder engine (SCE) that is based on a DV6 TED4 production engine, which has been employed for this study. For the CI-DF investigations, the compression ratio is reduced from 17.4:1 to 15.1:1 and the piston bowl geometry is changed from a re-entrant type to a flat piston bowl geometry. The relevant engine and injector parameters are listed in Table 1.

Table 1: Engine and injector specifications.

Publications:

 

  • M. Korkmaz, D. Ritter, B. Jochim, J. Beeckmann, D. Abel and H. Pitsch. Effects of injection strategy on performance and emissions metrics in a diesel/methane dual-fuel single-cylinder compression ignition engine. International Journal of Engine Research, pages 1-14, 2019.
  • M. Korkmaz, D. Golc, D. Ritter, B. Jochim, D. Abel and H. Pitsch. Experimental Investigation of Performance and Emissions Characteristics in a Single-Cylinder Compression Ignition Dual-Fuel-Engine. In Proceedings of the European Combustion Meeting, April 18th-21st, Dubrovnik, Croatia, 2017. 
  • M. Korkmaz, B. Jochim, M. Bode, J. Beeckmann, H. Pitsch, D. Ritter and D. Abel. Experimental Investigation and Analysis of Performance and Emissions Characteristics of a Single-Cylinder Compression Ignition Dual-Fuel-Engine for Model-Based Combustion Control. In Symposium for Combustion Control, June 28th-29th, Aachen, Germany, 2017.
  • D. Ritter, D. Abel, M. Korkmaz, H. Pitsch and T. Albin. Control of CNG-Diesel Dual-Fuel Engines. In AUTOREG 2017 – Automatisiertes Fahren und vernetzte Mobilität, 8. VDI/VDE Fachtagung, Berlin, Deutschland, 2017.

 

 

Contact

Dominik Golc

 

Other engine test benches

CI-Engine

SI-Engine