Aerodynamic measurements flames

A number of techniques have been used successfully to measure temperature profiles in flames thermocouples, resistance thermometers, shadowgraphs, interferometers, pyrometers, spectrometers, pneumatic probes, and aerodynamic measurements. The most useful of these techniques have proven to be the thermocouple method and the inclined slit technique. 

For example, test image 5 yielded nonzero probabilities for three of the flames (see Figure 15.12 and Table 15.2). Since the highest probability was obtained for the correct pattern, the identification was successful in this case. It should also be noted that flames 6 and 7 were also very similar, because variations in swirl number of secondary air in the range of 0 to 50% had little influence on the aerodynamics of the flame for SI = 100%, as evidenced by the very similar NO emissions measured for the three flames. 

Velocity and stream tube geometry are usually considered the aerodynamic parameters of flames. Aerodynamicists consider density as a third aerodynamic variable, but since this is directly related to the composition measurements (density is the sum of the pointwise concentration measurements) we will classify density as a compositional property. 

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