Unsteady Load of Partial Admission Control Stage Rotor of a Large Power Steam Turbine

Lampart, Piotr; Szymaniak, Mariusz; ̧dkowski, Romuald Rza

doi:10.1115/gt2004-53886

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…Determining the value of aerodynamic damping is difficult and is usually affected by high error. It can be done using analytical formulas (Hanson et al, 1953;Klepacki, 1975), computational fluid dynamic (CFD) methods (Lampert et al, 2004), experimental measurements (Brown, 1981), or estimated based on the damping values achieved in similar engines.…”

Section: Aerodynamic Dampingmentioning

confidence: 99%

Insight into Damping Sources in Turbines

Moneta

2022

Fatigue of Aircraft Structures

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Blade vibrations in aircraft engines are a significant challenge that must be overcome during the design and development of modern turbine engines. Vibrations lead to cyclic displacements and result in alternating stress and strain in undesired environments (high temperatures, erosion, corrosion of the surface, etc.). Under resonance conditions, stress amplitudes can increase and exceed their safety limits, and in extreme cases, can lead to engine failure. One method to reduce resonance vibrations is to increase damping in the turbine assembly. This paper presents and describes vibration damping sources in the turbine, including aerodynamic, material, and friction damping. Additionally, typical damping values for each damping component are presented and compared.

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Section: Aerodynamic Dampingmentioning

confidence: 99%

Insight into Damping Sources in Turbines

Moneta

2022

Fatigue of Aircraft Structures

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“…The position of admission arcs was also analyzed. An unsteady flow simulation in a 200 MW turbine with partial admission was described in [8]. Analyzed were the unsteady forces acting on control stage rotor blades.…”

Section: Introductionmentioning

confidence: 99%

Archives of Thermodynamics

Koprowski,

Rządkowski

2021

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In small steam turbines, sometimes the efficiency is not as important as the cost of manufacturing the turbine. The Curtis wheel is a solution allowing to develop a low output turbine of compact size and with a low number of stages. This paper presents three fully dimensional computational fluid dynamics cases of a Curtis stage with full and partial admission. A 1 MW steam turbine with a Curtis stage have been designed. The fully admitted stage reaches a power of over 3 MW. In order to limit its output power to about 1 MW, the partial admission was applied. Five variants of the Curtis stage partial admission were analyzed. Theoretical relations were used to predict the partial admission losses which were compared with a three-dimensional simulations. An analysis of the flow and forces acting on rotor blades was also performed.

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“…The inlet of a steam turbine generally consists of inlet boxes with partial admission together as well control and shut-off valves at the front of the turbine. Unsteady forces acting on rotor blades caused by partial admission are analysed in [1,2].…”

Section: Introductionmentioning

confidence: 99%

Archives of Thermodynamics

Koprowski,

Rzadkowski

2021

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This paper analyses the influence of three different ring-type inlet duct geometries on the performance of a small 1 MW backpressure steam turbine. It examines the efficiency and pressure drop of seven turbine variants, including four spiral inlet geometries and three stages with a mass flow rate around 30 t/h. A one-pipe and two-pipe inlets are analysed from aerodynamical point of view, taking into account stator and rotor blades in three stages without the outlet. An outlet is added to the best variant. Also analysed is the occurrence of vortices in the inlets of the studied variants 1-7 as well as the efficiency, drop pressure, turbine power and mass flow. Finally, the best inlet for a 1 MW steam turbine is suggested.

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Unsteady Load of Partial Admission Control Stage Rotor of a Large Power Steam Turbine

Cited by 14 publications

References 2 publications

Insight into Damping Sources in Turbines

Insight into Damping Sources in Turbines

Archives of Thermodynamics

Archives of Thermodynamics

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