4. For the subsonic axial-flow air expander specified, calculate the stagnation and static pressures and temperatures and the Mach number at the rotor-inlet plane (figure). Also find the rotor rotational speed and the nozzle-inlet blade height for constant-outer-diameter blading. Sketch the form of the complete turbine expansion on an enthalpy-entropy chart. The axial velocity will be constant at this design point. Mass flow, m= 2 kg/s Nozzle-inlet stagnation temperature, Toni 400 °C. Absolute nozzle-inlet stagnation pressure. Po.al=3 bars(= 3 x 105 N/m²) Mean diameter, d. 0.25 m. Blade height at rotor entry, I = 0.1d (= 1/2[d, - dnl). Flow angle at nozzle exit, a, 70° to axial direction. Drop in stagnation pressure in nozzle, Apo= 0.05 bar Rotor peripheral speed at mean diameter, = 0.5x (component of nozzle outlet velocity, Ca..). dsh dnb dm (N 3 4

4. For the subsonic axial-flow air expander specified, calculate the stagnation and static pressures and temperatures and the Mach number at the rotor-inlet plane (figure). Also find the rotor rotational speed and the nozzle-inlet blade height for constant-outer-diameter blading. Sketch the form of the complete turbine expansion on an enthalpy-entropy chart. The axial velocity will be constant at this design point. Mass flow, m= 2 kg/s Nozzle-inlet stagnation temperature, Toni 400 °C. Absolute nozzle-inlet stagnation pressure. Po.al=3 bars(= 3 x 105 N/m²) Mean diameter, d. 0.25 m. Blade height at rotor entry, I = 0.1d (= 1/2[d, - dnl). Flow angle at nozzle exit, a, 70° to axial direction. Drop in stagnation pressure in nozzle, Apo= 0.05 bar Rotor peripheral speed at mean diameter, = 0.5x (component of nozzle outlet velocity, Ca..). dsh dnb dm (N 3 4

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Turbomachines 4