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In: Mechanical Engineering

Q1) How do the inefficiencies of the turbine and the compressor affect (a) the back-work ratio...

Q1) How do the inefficiencies of the turbine and the compressor affect (a) the back-work ratio and (b) the thermal efficiency of a gas-turbine engine? Q2) The nozzle of a single stage impulse discharges the working fluid at an angle of 25° to the plant of rotation of the blades. The fluid living the blades with an absolute velocity of 290 m/s and a trailing angle of 60° to the plane of rotation. The blades have equal inlet and outlet angle and there is 5% reduction in the axial velocity component over the stage. (a) determine (i) the blade angle, (ii) the blade work per kg fluid, (iii) the blade velocity coefficient, (iv) the blade efficiency. (b) If the fluid is steam and the nozzle inlet conditions are 1,5 bar. 150 °C determine the pressure at the moving blades and the express as a percentage of isentropic enthalpy drop (i) the nozzle loss, (b) the loss in blade channels, (iii)the disk friction loss. (c) The nozzle efficiency is 87% and the disk friction loss is 3% of the work done on the blades.

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