Discussion
Air entering a combustor is split 20 per cent to the primary zone, 20 per cent intermediate and the rest to dilution and cooling. With \( 60 \ \mathrm{kg/s} \) total, the dilution and cooling flow is
Answer: C
The remaining fraction is 60 per cent, giving \( 0.6 \times 60 = 36 \) kilograms per second. The large share devoted to cooling and dilution is exactly why the overall mixture is so much leaner than the primary zone's.
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