Measurements and Diagnostics of a Gas Extraction Probe

An endeavor is made to design the intrusive emission measurement technique to predict the combustion reaction with a precise species concentration. The present study built two (P1 and P2) different orifice diameters of gas sampling probes with a water-cooled system. A laminar premixed CH4/Air one-dimensional flame is chosen for the product concentration measurements. The flame area contraction ratio using direct images demonstrates probe-induced flame interference. The probe configuration is evaluated based on thermo-physical properties and emission measurement. The sampling velocity, quenching temperature, and residence time emphasize the understanding of aerodynamic quenching in the designed probe. The sampled gas temperature is observed to be well below the quenching temperature limit within a chemical time scale. The smaller orifice diameter of the probe, in this case, P2, is most likely to measure species concentration accurately. In addition, a higher sampling velocity and lower flame stretching can be expected. The gas sampling probe measured CO2 concentration corroborates with the numerical solution.