Performance of Low Pressure Turbine Stages. P.M.V. Subbarao Associate Professor. Department of Mechanical Engineering Indian Institute of Technology, Delhi. More Problems and Higher Outputs…. L P Turbine Stages. LP Turbine Exhaust System .
Department of Mechanical Engineering
Indian Institute of Technology, Delhi
More Problems and Higher Outputs…..
Annulus restriction loss
Annulus velocity (m/sec)
Total Exhaust Loss
Condenser flow rate
Gross hood loss
Exhaust Loss of dry flow
Actual leaving loss
Percentage of Moisture at the Expansion line end point
Annulus Velocity (m/s)
Governing Stage Efficiency Calculations
= Correction coefficient for governing stage efficiency.
Calculations of HP and IP Turbine Efficiencies factors affecting the turbine performance.
= average steam flow rate =
= Steam flow rate at entry of group in kg/sec,
= Steam flow rate at exit of group in kg/see
is the available enthalpy drop of the group
Calculations of LP Turbine Efficiency factors affecting the turbine performance.
where correction for wetness fraction
= 0.8 for peripheral moisture separation design.
Exit velocity loss is given by
average diameter to blade height ratio is
i = No. of flows in LP turbine
= Nozzle exit angle
Z = No. of stages in group,