Ingeniare. Revista chilena de ingeniería
versión On-line ISSN 0718-3305
CADAVID, Francisco; URIBE, Julián y AMELL, Andrés. COMPARISON OF SAMPLING CHEMICAL SPECIES IN REACTING ZONES USING PROBES WITHOUT SONIC NOZZLE. Ingeniare. Rev. chil. ing. [online]. 2010, vol.18, n.2, pp. 254-258. ISSN 0718-3305. doi: 10.4067/S0718-33052010000200012.
The analysis of combustion products inside flames reaction zones and combustion chambers requires special equipment and methods of sampling compared to measurements made in chimneys. For example, non-intrusive experimental devices, such as laser techniques, or intrusive ones, such as sampling probes, should be used in zones where a flame is present. The use of the first ones means high costs, while the second ones must guarantee that the combustion reactions do not continue inside the sample probe; otherwise significant errors occur in the species measurements. To identify whether there are thermal and chemical kinetic effects that produce differences in the major species measurement, this paper presents a comparison of sampling results inside the reaction zone of a partially premixed flame when two types of sample probes are used: one with a sonic neck and a convective cooling of the sample, and another made just of a straight stainless steel tube. The results show that when using a straight tube there are errors in CO2 and CO measurements up to 7.0%, and errors in O2 measurements above 14%.
Palabras clave : Gas sample probe; aerodynamic quenching; interference probes.