Instantaneous temperature and density by spontaneous Raman scattering in a piston engine

Journal Article · Tue Jan 01 04:00:00 EST 1980 · AIAA Pap.; (United States)

DOI:https://doi.org/10.2514/6.1980-1359· OSTI ID:6795493

Smith, J R

A pulsed spontaneous Raman scattering (SRS) system that achieves single-shot temperature and nitrogen density measurements in a homogeneous charge, spark ignition engine is described. A Q-switched, frequency doubled YAG laser was used to obtain time resolution of 10 nanoseconds. The nitrogen density was determined from the Stokes vibrational Raman intensity and the temperature was determined from the ratio of anti-Stokes to Stokes vibrational intensities. The moments of the probability distribution functions (PDFs) for both nitrogen density and temperature at various crank angles at equivalence ratios of 0.72, 0.81, 0.91 and 1.0 are presented. Cycle-averaged spectral scans demonstrating the lack of laser induced interferences are also presented.

• Research Organization: Sandia Laboratories, Livermore, CA
• OSTI ID: 6795493
• Journal Information: AIAA Pap.; (United States), Journal Name: AIAA Pap.; (United States) Vol. 80-1359; ISSN AAPRA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
CYLINDERS
DENSITY
DISTRIBUTION FUNCTIONS
ELEMENTS
ENGINES
FERRITE GARNETS
FLAME PROPAGATION
FLAMES
FUNCTIONS
GAS ANALYSIS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
LASERS
LIGHT SCATTERING
MINERALS
NITROGEN
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PISTONS
RAMAN SPECTRA
SCATTERING
SILICATE MINERALS
SOLID STATE LASERS
SPECTRA
TEMPERATURE MEASUREMENT
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS