1. A premixed stoichiometric methane-air flame has a laminarflame speed of 0.33 m/s and a temperature of 2200 K. The reactantsare initially at 300 K and 1 atm. Find the velocity of thecombustion products relative to the flame front and the pressurechange across the flame. Assume that the reaction goes tocompletion and there is no dissociation.
2. Repeat Problem 1 for a premixed stoichiometric methanol-airflame. The flame speed is 0.48 m/s and the flame temperature is2000 K.
3. For methane, the maximum laminar flame speed in pure oxygenis 11 m/s, whereas in air the maximum flame speed is 0.45 m/s.Explain what causes this increase in the flame speed.
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