In order to improve the aerodynamic performance of steam turbine nozzle, it is necessary to
study the effect of blade solidity on the nozzle flow field，as some patents designs. To carry out the
numerical simulation for the blade solidity of 2.56, 2.87 and 3.05 by the CFD technology, the result of
numerical simulation shows that: most of the flow in the cascade passage is two-dimensional laminar
flow on the three kinds of solidity, the flow enters the 3D turbulent zone until near the trailing edge,
the size of turbulent zone increases with the increasing degree of blade solidity, the total pressure loss increases with the
increasing of blade solidity.
Keywords: Steam turbine, nozzle, blade solidity, aerodynamic performance, numerical simulation.
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