Abstract
This article deals with numerical modelling of flow in an axial turbine stage with prismatic blades which are not equipped with shroud. In this case flow through a radial gap above and below ends of blades leads to generation of strong secondary vortices which significantly affect an effciency of the stage. The main attention is paid to turbulence modelling. Besides a linear model based on Boussinesq approximation a nonlinear model based on higher order closure formula is used. Also an effect of a curvature correction is taken into account.
Highlights
IntroductionThe axial steam turbine of low power (around hundreds kilowatts to units megawatts) are typically designed in configuration with the drum-type rotor
The axial steam turbine of low power are typically designed in configuration with the drum-type rotor
This article deals with numerical modelling of flow in an axial turbine stage with prismatic blades which are not equipped with shroud
Summary
The axial steam turbine of low power (around hundreds kilowatts to units megawatts) are typically designed in configuration with the drum-type rotor. It means that the rotor blades are carried directly by the rotor of large diameter. Flow through the radial gap generates an intensive secondary vortices which interacts with following blade wheel. In general the turbulence models based on first order closure formula are not able to sufficiently well predict the secondary flow structures. Present work is focussed on turbulence model based on nonlinear second order closure formula
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