S. Simonini et al., Soot temperature and concentration measurements from colour charge coupleddevice camera images using a three-colour method, P I MEC E C, 215(9), 2001, pp. 1041-1052
Citations number
10
Categorie Soggetti
Mechanical Engineering
Journal title
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
The three-colour method has been developed in order to turn chromatic infor
mation in charge coupled device (CCD) camera images of combustion into flam
e temperature and soot concentration measurements. The method showed the fo
llowing advantages over the two-colour method from which it is derived: onl
y one camera is needed; no further calibration is required once the respons
e curve of the camera is known; it does not rely on light intensity but on
ratios between colour components, making it easy, to adapt to different ope
rating points with different flame brightness. The results on temperature e
valuation were compared with a thermodynamic model, and better agreement wa
s found in the late stages of the cycle, when the radiation from chemical r
eactions becomes negligible. The error analysis showed that the calculation
s for soot concentration are ill-conditioned, but when the results are inte
grated to give a soot loading the accuracy is improved and there is clear e
vidence of soot evolution and destruction during combustion.