Which outcome occurs when an ideal closed-cycle gas turbine operates beyond its design compressor pressure ratio?

💡 Explanation

When a gas turbine compressor operates beyond design pressure ratio, increased pressure and temperatures exacerbate creep and fatigue failure mechanisms because turbine blade material strength reduces due to very high temperatures, leading to blade cracking. Therefore blade fatigue decreases, rather than stall margin increasing, optimal efficiency, or lower temperatures, all require operation closer to design conditions.

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