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)

Experimental investigation of spray penetration and mixture formation of high pressure fuel injection systems


In order to satisfy the legislative requirements concerning the exhaust gas emissions, fuel consumption, and noise emissions of combustion engines, it is necessary to obtain insight in the mixture formation process and combustion. The mixture formation and consequently the combustion is mainly influenced by the injection process and the spray formation. The scope of the experimental investigation is the characterisation of the momentum, mass and energy exchange between the injected liquid fuel and the ambient gas phase. For the experimental investigations of the two phase flows a high pressure chamber had been developed, which enables the investigation of spray development and combustion at typical pressures and temperatures in Diesel engines (pmax = 50 bar, Tmax = 800 K). The high pressure chamber allows the mounting and experimental investigation of commonly used multi hole nozzles.

Characterisation of the injection process

Determination of the time slope and mass of the injected fuel with a fuel injection meter (Bosch tube).

Characterisation of the spray penetration and mixture formation

Determination of fuel jet integral dimensions (penetration, spray angle):

  • Time slope of liquid fuel spray penetration and angle by means of the 2D-Mie scattering light technique.
  • Time slope of gaseous fuel spray penetration and angle by means of the 2D-Schlieren and shadow technique.
  • Determination of the evaporation characteristics of high pressure Diesel injection systems by means of a combined 1D-Raman / Mie scattering technique.

Determination of local spray dimensions as droplet size and velocity:

  • Local determination of droplet size and velocity distributions

Characterisation of the soot formation and oxidation process

Time slope of the soot concentration by means of the 1D-light extinction technique

Future Works

Investigation of the influence of the fuel composition (1 and 2 component model fuels) on the spray and mixture formation process.

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