Experimental Evaluation of Axial Reaction Turbine Stage Bucket Losses

Klimko, Marek; Lenhard, Richard; Zı́tek, Pavel; Kadúchová, Katarína

doi:10.3390/pr9101816

“…The working medium was air sucked from the atmosphere by a compressor. More detailed information about the experimental device can be found in the publication [12,13].…”

Section: Methodsmentioning

confidence: 99%

“…The evaluation methodology, including the method of calibrating the pneumatic probes, is described in [12].…”

Section: 𝑐 = 2𝐻mentioning

confidence: 99%

Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket

Klimko

¹

,

Zı́tek

²

,

Duda

³

et al. 2022

Energies

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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 positive or negative incidence. One of the basic objectives in turbine stage design is to estimate the flow behaviour of the turbine stage during off-design operation as accurately as possible and to quantify the corresponding decrease in efficiency. The available loss prediction models allow the estimation of the loss distribution when the incidence angle changes in the preliminary design phase. However, the incidence angle is actually affected by the velocity of circulation, which changes the input velocity vector (induced incidence). Thus, the blade row angle of attack is different from the angle based on the velocity diagram calculations. The result of our paper is a relation for estimating the angular difference of the input flow angle to the bucket defined as a function of the turbine operation mode.

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“…In the past, the flow inside turbines has been explored mainly numerically (Denton and Pullan, 2012;Sieverding and Manna, 2020) or by using pressure measurements (Klimko and Okresa, 2016;Ilieva, 2017;Klimko et al, 2021;Porreca et al, 2007). Our recent work uses Particle Image Velocimetry to map flow in some selected planar area past the rotor (Duda et al, 2021) or stator wheel (Duda et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

PIV Measurement of Wakes Past Stator Wheel Inside Air Test Turbine VT-400 in Two Axial×Tangential Planes

Duda,

Uruba,

Yanovych

et al. 2024

Engineering Mechanics

0

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VT-400 is a single-stage test turbine working with ambient air located at the University of West Bohemia in Pilsen. Inside this turbine, we perform a PIV (Particle Image Velocimetry) measurement of the flow field in two planes oriented in axial × tangential direction. There planes are located between the stator wheel and rotor wheel; first one is near the hub, second one at the middle of blade height. The spatial distribution of velocity fluctuations displays system of wakes and jets oriented diagonally over the studied area. The jets are represented by higher mean velocity and lower turbulence, the wakes oppositely. The spatial size of fluctuations is analyzed in terms of autocorrelation function: the size of correlated region is comparable with the wake width, additionally, there is apparent a wave in the stream-wise direction. At different turbine working parameters, we observed at least two distinct wavelengths. The neighboring wakes do not interact in the limits of studied areas.

show abstract

“…In the past, the flow inside turbines has been explored mainly numerically (Denton and Pullan, 2012;Sieverding and Manna, 2020) or by using pressure measurements (Klimko and Okresa, 2016;Ilieva, 2017;Klimko et al, 2021;Porreca et al, 2007). Our recent work uses Particle Image Velocimetry to map flow in some selected planar area past the rotor (Duda et al, 2021) or stator wheel (Duda et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

PIV Measurement of Wakes Past Stator Wheel Inside Air Test Turbine VT-400 in Two Axial×Tangential Planes

Duda,

Uruba,

Yanovych

et al. 2024

Engineering Mechanics

0

View full text Add to dashboard Cite

VT-400 is a single-stage test turbine working with ambient air located at the University of West Bohemia in Pilsen. Inside this turbine, we perform a PIV (Particle Image Velocimetry) measurement of the flow field in two planes oriented in axial × tangential direction. There planes are located between the stator wheel and rotor wheel; first one is near the hub, second one at the middle of blade height. The spatial distribution of velocity fluctuations displays system of wakes and jets oriented diagonally over the studied area. The jets are represented by higher mean velocity and lower turbulence, the wakes oppositely. The spatial size of fluctuations is analyzed in terms of autocorrelation function: the size of correlated region is comparable with the wake width, additionally, there is apparent a wave in the stream-wise direction. At different turbine working parameters, we observed at least two distinct wavelengths. The neighboring wakes do not interact in the limits of studied areas.

show abstract

Experimental Evaluation of Axial Reaction Turbine Stage Bucket Losses

Cited by 10 publications

References 10 publications

Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket

Estimation of the Induced Incidence of a High Reaction Axial Turbine Bucket

PIV Measurement of Wakes Past Stator Wheel Inside Air Test Turbine VT-400 in Two Axial×Tangential Planes

PIV Measurement of Wakes Past Stator Wheel Inside Air Test Turbine VT-400 in Two Axial×Tangential Planes

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