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In SI engines, maximum flame speed is obtained when the equivalence ratio is between
  • a)
    1.1 and 1.2
  • b)
    1.0 and 1.1
  • c)
    1.2 and 1.3
  • d)
    Less than 1.0
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In SI engines, maximum flame speed is obtained when the equivalence ra...
The ratio of actual fuel air ratio to stoichiometric fuel air ratio is called equivalence ratio.
The highest flame velocities are obtained with somewhat richer mixture of equivalence ratio 1.1 to 1.2. When the mixture is made leaner or richer the flame speed decreases. Less thermal energy is released in case of lean mixture resulting in lower flame temperature. Very rich mixture leads to the incomplete combustion which results again in the release of less thermal energy.
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