Turbomachinery- Impulse Turbine

Problem: 1) The steam from the nozzles of a single wheel impulse turbine discharges with a velocity of 600 m/s at an angle of 20 degrees. The blade wheel rotates at 3000 rev/min and the mean blade radius is 590 mm. The axial velocity of the stream at the exit from the blades is 164 m/s and the blades are symmetrical. Sketch the annotated velocity triangles and calculate: a) the blade inlet angle b) the diagram specific work c) the diagram efficiency d) the blade velocity coefficient e) Show that for symmetrical blading and no friction {see attachment for equation} and determine the optimum blade speed ratio and efficiency. Make a sketch of your results.

Turbomachinery - Reaction Turbines

2) Sketch the fully annotated velocity triangles for a Parsons turbine stage. Use your sketch to show that the specific work produced per stage is given as {see attachment} At a particular stage of a Parsons reaction turbine, the mean blade speed is 60 m/s and the steam specific volume v = 0.577 m3/kg. The fixed and moving blades at this stage have inlet angles of 30 degrees and exit angles of 20 degrees. Sketch the velocity triangles and find: a) The axial velocity b) The blade height for this stage if the blade height is 1/10 of the mean blade diameter and the steam mass flow is 13.5 kg/s c) The stage power d) The diagram efficiency

Turbomachinery - Reaction Turbines

1) Steam at 15 bar and 350 degrees C is expanded through a 50% reaction turbine to a pressure of 0.14 bar. The stage efficiency is 80% for each stage and the reheat factor is 1.05. The expansion is to be carried out in 10 stages and the required power is 6000 kW. Calculate the steam flow required, assuming that the stages all develop the same work. At one stage the pressure is 1 bar (saturated vapour) and the blade speed ratio is 0.77. If the blade height is 1/20 of the blade mean diameter, calculate the value of the mean blade diameter and the rotor speed. 2) A 50% reaction turbine expands 34000 kg/hr of steam from 20 bar, 400 degrees C to a pressure of 0.2 bar. The turbine is desig... click for more

Turbomachinery - Impulse & Reaction Turbines

See attachment for complete questions. Question 6: ... calculate the as yet unknown velocities and then determine the specific work ouput and the outlet pressure from the rotor. Question 4: ... calculate the power output for full admission to the 2cm long rotor blades. Question 5: ... chart for steam that is supplied, plot the hs diagram for the nozzle and rotor and hence determine the outlet pressures of each.

centrifugal, axial -flow compressors & impulse turbines

An axial compressor is required to compress a large molecule refrigerany... Please see attached for full question.