Measurements of Temperature and N2 Number Density in the Combustion Cylinder of a Compression Ignition Engine Utilizing Laser-Raman Diagnostics

Laser-Raman scattering has been used to measure temperature and nitrogen number density in the combustion cylinder of a specialized research CI engine. Measurements were made as a function of crank angle degrees (CAD) for unfueled operation at 500 and 1,000 rpm and for operation at 1,000 rpm using n- heptane as an alternate fuel to diesel fuel no. 2. A pulsed ruby laser system was the excitation source for the Raman scattering, and the CAD resolution of the measurements was .0015 to 0.36 degrees.
Prepared in cooperation with ARO, Inc., Tullahoma, TN.