Discussion
Statement I: A swirler is fitted at the fuel injector even though it adds pressure loss.
Statement II: The recirculation it creates carries hot products back to reignite the incoming mixture.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains why the first is worth its cost. The swirler sets up a toroidal recirculation in the primary zone that continuously carries hot combustion products back upstream to meet the incoming fuel and air, so the flame is reignited continuously rather than being blown downstream. Without it no flame would be held at combustor velocities.
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