A diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the engine compressor without any work of heat int

Question

A diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the engine compressor without any work of heat interactions. Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 350 m/s and the exit state is 200 kPa and 90°C. For calculation, assume the specific heat is constant at the average temperature of the inlet and the exit.

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Đan Thu 4 years 2021-08-28T00:25:53+00:00 1 Answers 20 views 0

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  1. thuhuong
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    2021-08-28T00:27:16+00:00
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    Answer:

    Explanation:

    Given ;  P1 = 100 kPa, T1 = 30°C, T2 = 90°C, P2 = 200 kPa, V1 = 350 m/s

    From energy conservation at inlet and outlet

    h1 + (1/2)v1² = h2 + (1/2)v2²

    CpT1 + (1/2)v1² = CpT2 + (1/2)v2²

    .718(90-30) x 103= 0.5x (350²-v2²)

    velocity at the exit of a diffuser ;  V2=190.63m/s

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