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← ScienceWhich outcome increases when a jet afterburner mixes suboptimal fuel?
A)Increased unburnt hydrocarbon emissions✓
B)Turbine blade fatigue strengthens
C)Optimal stoichiometric combustion occurs
D)Mass flow rate becomes constant
💡 Explanation
Increased unburnt hydrocarbon emissions occurs because incomplete combustion takes place; the afterburner's limited mixing leads to fuel-rich zones undergoing pyrolysis, whose outcome is uncombusted hydrocarbons, therefore emissions increase; rather than completely oxidizing, it forms byproducts.
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