An axial compressor is designed at 15000 rpm and inlet stagnation temperature 300 K. During testing the inlet stagnation temperature is 280 K. What speed preserves the same performance characteristics?
Match corrected speed $N/\sqrt{T_0}$ for similar compressor operation. Therefore $N_{test}=15000\sqrt{280/300}=14491.4$ rpm, giving B. Colder inlet gas requires a lower physical rpm to retain the same nondimensional blade-speed condition.
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