Measurements of fluctuating temperature in a free-jet diffusion flame

✍ Scribed by W. Lenz; R. Günther

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 460 KB
• Volume: 37
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(80)90071-1

✦ Synopsis

Temperature measurements were made in a turbulent free-jet diffusion flame, that include average and fluctuating values as well as probability spectral densities. The measuring system consisted of a thermocouple whose frequency response was determined at each measurement point and compensated with an electrical network. The results of the fluctuation measurements show that the maxima of the root-mean-square (rms) values are situated just outside the main reaction zone. Root-mean-square values of up to 600 K were measured at these locations, whereas they were only about 150 K on the flame axis upstream of the main reaction zone. In some regions of the flame the spectra reveal temperature fluctuations with a frequency of more than 10 kHz. The statistical quantities of mean value, variance, skewness, and flatness of the temperature distribution were determined from the measured probability density function (PDF).