Advanced Diagnostics

​The following diagnostic techniques are routinely used for research within CERC:
 
- High speed imaging for time resolved structure
  • Using front illumination imaging for sprays (high intensity LED’s)
  • Via schlieren or shadowgraphy in back-illumination for various flows (injector interior flows, gas-phase jets, Diesel spray liquid length determination, flames etc.)
  • Using natural luminescence from flames (e.g. OH or CH chemiluminescence) and/or soot thermal emission (can detect two images at two wavelengths to extract soot temperature via the Planck black body distribution)
- Phase Doppler interferometry (PDI) for single-point measurement of drop size distributions and 2-D velocities in a spray
- Planar imaging
  • Elastic scattering (Mie) imaging of droplets and planar laser induced fluorescence (PLIF) imaging of fuel vapor in sprays, using fuel tracers - temperatures are also possible
 
Image of droplet density from an outward-opening piezo gasoline spray, with PIV velocity vectors as well.
  • - Laser induced exciplex fluorescence (LIEF) imaging for 2-D images of drops/vapor and temperature in sprays
  • - PLIF imaging of species (e.g. OH and NO) and temperature during combustion
  • - Particle image velocimetry (PIV), producing a 2-D image of 3-D velocity vectors
  • - Laser induced incandescence (LII) imaging of soot
 
- Ballistic imaging of initial spray breakup
The following equipment exists within the Combustion Division at Chalmers:
 
- A Quantel spectroscopic pulsed Nd:YAG/Dye laser system (a second, new system will soon be purchased with the financial support of the Knut and Alice Wallenberg Foundation)
 
- A Lambda Physik excimer laser
 
- A two-pulse Spectra-Physics Nd:YAG laser (2nd harmonic) with LaVision cameras and software for 3-D PIV
 
- A Spectra-Physics Nd:YAG laser with 2nd, 3rd, and 4th harmonics
 
- Cameras
  • High speed (a second, new high speed camera will soon be purchased with the financial support of the Knut and Alice Wallenberg Foundation)
  • Two LaVision intensified CCDs
  • Two Andor iXON electron multiplying CCD’s
  • Two new fast-shutter cameras will soon be purchased with the financial support of the Knut and Alice Wallenberg Foundation
- Phase Doppler interferometry –TSI system (a second, new PDI will soon be purchased with the financial support of the Knut and Alice Wallenberg Foundation)
 
- Three Spectra-Physics Ti:sapphire femtosecond regenerative amplifiers seeded by one mode-locked laser, used for multiple image ballistic imaging
 
Two chirped-pulse regenerative amplifiers for ballistic imaging.


Published: Thu 26 Nov 2015.