1987 Volume 22 Issue 5 Pages 323-328
The relationship of soot concentration, gas temparature and intermediate hydrocarbon (polynuclear aromatic) compounds produced in the pyrolytic combustion paths in an important to understand the pathway of soot formation. This experimental object become evident the presence of emission excited in oilspray flame by the blue laser light (λ=488nm, 1.8W) . The scattering characteirgation from polynuclear aromatic hydrocarbons are not dealing here with elastic scattering phenomena, but rather with a fluoreseent emission.
The results obtained are as follows.
The maximum peak wavelength is in the neighbourhood of 530 nm. The fluorescent emissve intensity increases rapidly with soot concentration along the flow near the nozzle tip where fuel-rich condition prevail and hydrocarbons are formed by being reacted from original fuel of A oil. The decay of fuloreseus emissive intensity and soot concentration becomes significant near the maximum temperature. The peak of the fluorescent emissive intensity in the radial profiles near the nozzle tip is located just inside the position of the temperature peak, which indicates that hydrocarbons are produced in the fuel rich region near the peak of the temperature. In this experimental result the fluorecent matter is able to estimate the aromatic hydrocarbon such as Pyrene.