Difference Between Turbine And Turbine
There are several differences between the flow through a turbine blade passage as compared with a compressor: Pressure drop in a turbine is much larger than the pressure rise in a compressor. The flow turning in a compressor: 20o-35o whereas in a turbine: as high as 160o. Turbine designer usually delays formation of shocks (to minimize losses); in a compressor shocks are one of the modes of deceleration.
Therefore transonic compressors usually have lower efficiency than transonic turbines. Exit flow matching • The operation of a turbine is affected by components upstream (compressor) and downstream (nozzle). • The compressor and turbine performance characteristics form an important part of this performance matching. • It was discussed earlier that turbines do not exhibit any significant variation in non-dimensional mass flow with speed. • However the
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• The operation of the nozzle under choked or unchokedcondition also influences the matching. • The similarity between the flow characteristic of a nozzle and a turbine is the fact that thermodynamically, both are flow expanders. • The matching between the turbine and the nozzle is identical to that between a free-turbine / power-turbine and the main turbine. • Once the nozzle is choked, the nozzle non-dimensional flow will reach its maximum value and will become independent of the nozzle pressure ratio
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