Abstract
In this paper there is described the numerical simulation of flow in the axial stator blade cascade with the radial gap between the hub and the stator blades. Influence of the gap size on distributions of the pressure, the Mach number, the kinetic energy losses, and the flow angle along the span is presented. There is also studied the possibility of modifying the shape of the hub to restrict the flow rate through the radial gap.
Highlights
The axial steam turbines of low power are typically designed with the drum-type rotor
It is clear that the secondary flow influences from 15% to 25% of the span for gap size from 0.6 mm to 1.4 mm
This study shows that the secondary flow through the radial gap strongly affects approximately twenty percent of the span
Summary
The axial steam turbines of low power are typically designed with the drum-type rotor. For reduction of a production cost a seal-less stator wheels are still in use In this configuration of the stator it is necessary to maintain the radial gap between the hub and the stator blades. Influence of the secondary flow through the radial gap must be taken into account in the design of the blades. Research of the influence of the radial gap on flow in the axial turbine stages is still very actual. The mass flux ratio through the radial gap and the total losses of the kinetic energy are discussed. It is studied change of the shape of the hub to reduce of the flow rate through the radial gap
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