Bartoloměj Rudas
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View article: Modifications of Balancing Slots in Drum Rotor Arrangement of Steam Turbine Stages and Their Influence on Efficiency
Modifications of Balancing Slots in Drum Rotor Arrangement of Steam Turbine Stages and Their Influence on Efficiency Open
An analysis of the industrial steam turbine market shows that many customers require steam turbines with relatively small output and high inlet steam pressures and temperatures, causing small nominal mass flows of steam through the turbine…
View article: Modelling humid air flow condensation in a linear blade cascade
Modelling humid air flow condensation in a linear blade cascade Open
Experimental test rigs such as linear blade cascades often use ambient humid air for internal aerodynamics investigation. However, experimental evidence of flow condensation can be found at higher Mach numbers, especially for lower inlet a…
View article: Impact of steam erosion on aerodynamic characteristics of the tip section of a long rotor turbine blade
Impact of steam erosion on aerodynamic characteristics of the tip section of a long rotor turbine blade Open
Results of aerodynamic research on original variant of tip section are compared with aerodynamic data obtained from research on eroded variant. The erosion of the inlet part of the profiles generates serious changes both in profile shape a…
View article: Enhanced Flutter Test Rig for a Transonic Flow in a Linear Turbine Blade Cascade and Numerical Data Validation
Enhanced Flutter Test Rig for a Transonic Flow in a Linear Turbine Blade Cascade and Numerical Data Validation Open
Modern efficient and robust steam turbines must be designed for large operating ranges and run at off-design conditions and high backpressures. Therefore, there is a danger that in some operating conditions, last-stage rotor blades can suf…
View article: Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket
Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket Open
This paper describes the effect of the incidence angle of the bucket on the performance of the axial turbine stage. The off-design operating conditions of the turbine stage result in a change in the velocity diagrams. This results in a pos…
View article: Pressure losses reduction in a steam turbine compact valve
Pressure losses reduction in a steam turbine compact valve Open
Valves are integral parts of modern steam turbines. They provide flexible operations and fast load changes which have become more often due to the increasing share of renewable energy. Along with this, the low pressure loss is required for…
View article: Turbine Cascades of Last Stage Blades for Wide Range of Operating Conditions
Turbine Cascades of Last Stage Blades for Wide Range of Operating Conditions Open
Recent trends in the electric energy market such as biomass, waste incineration or combined cycle power plants require innovative solutions in steam turbine design. Variable operating conditions cause significant changes in flow field surr…
View article: EXPERIMENTAL AND NUMERICAL STUDY OF CONTROLLED FLUTTER TESTING IN A LINEAR TURBINE BLADE CASCADE
EXPERIMENTAL AND NUMERICAL STUDY OF CONTROLLED FLUTTER TESTING IN A LINEAR TURBINE BLADE CASCADE Open
In this paper, experimental testing of flutter and numerical simulations using a commercial code ANSYS CFX and an in-house code TRAF are performed on an oscillating linear cascade of turbine blades installed in a subsonic test rig. Bending…
View article: Experimental measurement on the air test rig of the axial steam turbine exhaust casing
Experimental measurement on the air test rig of the axial steam turbine exhaust casing Open
This paper describes the aerodynamic design of the scaled air test rig of axial exhaust casing. The axial exhaust casings are used to benefit steam turbines of less than 180 MW, and their design can significantly affect the performance of …
View article: Effect of inlet turbulence on compressible flow through the tip-section turbine blade cascade with supersonic inlet
Effect of inlet turbulence on compressible flow through the tip-section turbine blade cascade with supersonic inlet Open
The contribution deals with the numerical simulation of 2D compressible flow though the tip-section turbine blade cascade with the supersonic inlet boundary conditions. The simulation was carried out by the in-house numerical code using th…
View article: CFD prediction of flutter of turbine blades and comparison with an experimental test case
CFD prediction of flutter of turbine blades and comparison with an experimental test case Open
Last stage blades are a key element of steam turbines and in many ways determine the turbine configuration alongside with the overall turbine performance. The total efficiency of the low pressure turbine section can be increased by extendi…
View article: Investigation of transonic and supersonic flow in the rotor tip section of the last LP steam turbine stage under different turbulence levels.
Investigation of transonic and supersonic flow in the rotor tip section of the last LP steam turbine stage under different turbulence levels. Open
Design of a new generation of the large power steam turbines leads to very long last rotor blades with tip sections operating often in supersonic region. The flow field in such tip sections is not fully explored and it is believed to be fa…