NOZZLE RING WITH NON-UNIFORMLY DISTRIBUTED AIRFOILS AND UNIFORM THROAT AREA
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United States of America Patent
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Issued Date -
Sep 25, 2014
app pub date -
Feb 26, 2014
filing date -
Mar 19, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A segmented nozzle ring is disclosed having a throat area between neighboring vanes that is the same for each segment which is achieved by rotation (i.e., opening or closing of the throat area) of the individual vane compounds belonging to the different segments. The resulting uniform throat area leads to a uniform exit flow angle of the nozzle and a uniform inlet flow angle of the rotor. As a result, high-cycle fatigue excitations of the rotor caused by the non-uniform flow can be eliminated, the thermodynamic efficiency of the turbine stage can be improved, and the nozzle ring need not be arranged in a fixed position relative to the gas inlet casing.
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