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.