M.Sc. Jannick Erhard

Working area(s)

CRC / TRR 150

Contact

work +49 6151 16-28907
fax +49 6151 16-28900

Work L6|01 123
Otto-Berndt-Str. 3
64287 Darmstadt

  • Laser Diagnostics
  • Near-Wall Processes
  • Internal Combustion Engines
Figure 1: Engine Ignition after Direct Injection by the Spray G Injector
Figure 1: Engine Ignition after Direct Injection by the Spray G Injector

Our immediate concentration is on the crucial necessity for a prompt reduction of CO2 emissions. This concern holds significance across a wide spectrum of technologies, impacting both the economy and society. One of the primary contributors to impending CO2 emissions remains internal combustion engines. As a result, decreasing their emissions stands as a topmost priority. Equally essential is the enhancement of internal combustion engines in terms of fuel efficiency, the adoption of alternative fuels, and the minimization of local emissions like NOx and hydrocarbons.

The ongoing trend toward downsizing internal combustion engines is leading to an increased surface-to-volume ratio. Consequently, to optimize efficiency while simultaneously minimizing the emission of pollutants from IC engines, a comprehensive understanding of the near-wall processes is indispensable. The objective is to establish a fundamental comprehension of these physical processes and to render the measurement data usable for model validation.

Figure 2: Laser Diagnostics applied at the Research Engine
Figure 2: Laser Diagnostics applied at the Research Engine

A research engine designed for optical accessibility, featuring a quartz-glass liner and piston window, is employed to investigate the combustion and flow processes in SI or DISI engines. This engine's extensive optical accessibility allows for precise optical measurements covering a considerable portion of the cylinder. Scalar fields are evaluated using methods like laser-induced fluorescence (LIF), which examines parameters such as gas temperature, air-fuel mixture, flame propagation, and the presence of fuel wall films. For spray characterization, techniques like diffuse-background illumination (DBI) or Mie scattering are applied. Additionally, thermographic phosphors are utilized to measure wall temperatures. To capture the complexities of fluid movement, the utilization of particle image velocimetry (PIV) and particle tracking velocimetry (PTV) allows a deep understanding of flow dynamics down to the boundary layer. To investigating particle emissions, such as soot, laser-induced incandescence (LII) can be used.