Abstract:
To accurately, quickly and effectively detect the temperature distribution in the combustion cone of a cigar, a rapid detection method was developed. The results showed that: 1) There was significant variability in the temperature distribution and characteristic parameters inside cigar's combustion cone obtained from a single experiment. However, the average temperature data from multiple experiments was more suitable for characterizing the temperature distribution and characteristic parameters of the cigar combustion cone. 2) Compared with the traditional detection method, the temperature distribution obtained by the rapid detection method was more refined and could cover the whole combustion cone, and the combustion state was better matched with the CT image of the combustion cone. 3) At the 0-2 s puffing stage, the volume of the combustion cone
V0 (the volume with a temperature ≥200 ℃) decreased, the volume-averaged temperature
Tm and the maximum temperature
Tmax continuously increased, the volume of the high-temperature region (> 600 ℃) rapidly expanded; and the volumes of the low-temperature region (200-400 ℃) and the medium-temperature region (400-600 ℃) decreased. At the 2-40 s post-puffing smoldering stage, the volume of the combustion cone
V0 first decreased to a minimum value, then quickly reached a peak value and then began to decrease again. The volume of the low-temperature region first decreased to a minimum value and then increased.
Tm,
Tmax, and the volumes of the high-temperature and medium-temperature regions all increased to peak values after puffing and then decreased continuously. 4) During the 0-2 s puffing stage, the shapes of the low-temperature and medium-temperature regions of the combustion cone were basically unchanged, while the high-temperature region gradually expanded outward from a pentagon-like shape to an isosceles trapezoid-like shape, and the combustion state of the cigar gradually reached its optimal state. Compared with the traditional detection method, the rapid detection method is accurate and can simultaneously collect the temperature data at eight radial depths of a single cigar. After translation, reconstruction, interpolation and statistical analysis of the data, the approach can characterize the temperature distribution of the cigar combustion cone and obtain the characteristic parameters related to the combustion cone temperature.