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)

Spray Chamber

In recent years there has been an increasing awareness of the environmental effects, which has lead to stringent emission regulations on automotive engines. It has become a challenge for engine designers, to fulfil the restriction on the level of emissions. The nature of the combustion process is determined by the quality of the fuel spray, its distribution and mixing within the combustion chamber. The processes such as atomization, droplets distribution, and ignition have direct influence on the combustion performance and emission characteristics.

High pressure and temperature, flow- through combustion chamber

In order to study fuel spray characteristics and combustion details, a constant volume, constant flow rate, high pressure and temperature chamber is used. It is built at the Institute for Combustion Technology (ITV) at RWTH Aachen University. Non combustion spray characteristics such as penetration length and cone angle in both liquid and vapor phases, are determined by conducting Back-light Illumination Technique (DBI), Miescattering, and Shadowgraphy techniques. Combustion studies such as flame lift-off, ignition delay, and soot volume fraction (fv) are determined by OH chemiluminescence (OH*) and Saturated Planar Laser Induced Incandescence (SPLII) combined with Laser Extinction (LE) techniques, respectively.

Simultaneous High-Speed Diagnostic (DBI, Schlieren, and OH*)
Quantitative soot volume fraction (SPLII)

Both solenoid and piezo injectors are applied in the test-bench. The solenoid injector is controlled by a Smart ESG2 power unit laboratory controller and Labview programming is used for injection duration and timing control. The piezo injector is controlled by VEMAC controller. These instrumentations also enable variable and multiple injection timing strategies.

Single component fuels, mixtures, and biofuels are investigated under engine like conditions in a high pressure and high temperature chamber for a better understanding of the spray atomization and mixing process based on the fuel physical properties. Furthermore, nozzle geometry and injector types are also examined for the spray atomization tendency.

Contact Person

S. Kruse