Question

The laminar flame speed in a combustion chamber of a jet engine is

• A. inversely proportional to square root of thermal diffusivity of reactant mixture
• B. proportional to thermal diffusivity of reactant mixture
• C. inversely proportional to the temperature of reactant mixture
• D. proportional to viscosity of reactant mixture

Hint:

Optimizing the reactant mixture for lower thermal diffusivity can enhance the laminar flame speed, improving combustion efficiency.

Answer 1

The Correct Option is A

Step 1: Flame Speed Factors.
The laminar flame speed is influenced by how quickly the flame front can propagate through the unburned gas, which is affected by the thermal properties of the mixture.
Step 2: Relation with Thermal Diffusivity.
Higher thermal diffusivity means that heat can spread through the reactant mixture more quickly, thinning the reaction zone and potentially reducing the speed at which the flame front propagates.