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The influence of bandage flow interaction on efficiency of steam turbine stages operation (TH02020086)

Project title:

The influence of bandage flow interaction on efficiency of steam turbine stages operation (TH02020086)

Subject of the project:

Systematic research using both experimental and numerical approaches of the interaction of flow coming out of both shaft and over-bandages. To construct a so-called loss model for the turbine stages design using the knowledge gained from research, and to design the most suitable bandage geometry respecting the lowest loss of kinetic flow energy caused by the interaction of the output flow from bandages with the main working flow.


The primary objective of the project is to obtain the basis for building a loss model of interactions of parasitic (bandage) flow with the main flow. 

A complementary aim is to design and verify the geometry of bandages, the outlet area of bandage flows into the main flow, a modification of limiting walls and other modifications that will lead to a reduction of losses.

The use of experimental devices available at individual research sites will have the key importance. Currently, there is a number of different stage geometries tested in previous collaborations. These are stages with varying relative lengths and blade widths and stages with varying reaction levels. This geometry portfolio will preferably be suitably used to test the effect of bandage leaks and their subsequent mixing with the main flow.


The work will focus on two main areas and their influence on different blade lengths (comparison of VZLU and UWB experiments):

1) shaft bandages (i.e. bandages between the rotor shaft and the stator wheel or blades in the event of a drum rotor layout) and subsequent flow through the axial gap on the heel between the distributing and circular blades,

2) over-bandages and consequent flow and mixing with the main flow behind the stage. In this case, there is only a one-way flow where the leaked volume through the bandage is blown into the space behind the stage.

The main test methods will be experimental tests on test conditions available to the VZLU and UWB workplaces. Miniature multi-hole pressure probes, FRAPs for non-stationary measurements, and possibly CTA wire probes are available there for detailed measurements of the influence of the outflow from bandages into the main flow of the working medium. All of these measurement methods have been tuned when resolving previous projects.

Main resolver: 

Czech Aerospace Research Centre (VZLU - Výzkumný a zkušební letecký ústav, a.s.)


Doosan Škoda Power s.r.o.

Dept. of Power System Engineering, UWB in Pilsen

The project beginning:

1. 1. 2017