The top image shows the visible flame of a normal-gravity blue flame burning in air, stabilized on a coflow burner, used for a schlieren demonstration experiment with fuel of 20% H2/25%CH4/55%N2 at a flow rate of 9.3 ml/s and a coflow air flow rate of 583 ml/s. The bottom image shows the corresponding rainbow schlieren of the flame with a 4mm wide vertically symmetric color filter. For more details, see the paper by Feikema, pp. 4826-4832.
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