An investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 3: Heterogeneous/homogeneous condensation

Cai, Xiaoshu; Niu, Fuhuan; Ning, Tao; Wu, Guangyuan; Song, Yanping

doi:10.1243/09576509jpe906

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…For the reasons mentioned above it is recommended to obtain the boundary conditions from experimental measurements. They were in the past carried out on some turbines [1,2], recently results have been published only on 300 MW turbine with an air-cooling condenser [3,4]. There are of course many numerical simulations of flow that suitably solve the behaviour of the LSB -diffuser coupling [5,6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Flow in the Last Stage of 1090mw Steam Turbine

Hoznedl¹,

Sedlák²

2018

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The paper deals with experimental and numerical research in the last stage of real 1090MW steam turbine with the last steel blade length 1220mm placed in nuclear power station. The last stage was equipped with twelve static pressure taps. It was also possible to probe in two planes - before and behind the last stage using pneumatic or optical probes. A number of last stage flow parameters were determined at the root and tip wall for nominal turbine output. Among those parameters are static pressures, Mach and Reynolds numbers, last stage reactions and steam wetness. All the directly measured and evaluated flow parameters are taken from locally measured points and that is why even 3D CFD calculation of the whole system - last stage, diffuser and exhaust hood was implemented. Measured and calculated parameters are compared. Especially static pressures are in very good agreement; the only steam wetness has bigger difference due to different measurement position. Locally measured values are enough to estimate the flow behavior of the last stage. On the other hand, the CFD simulations with well determined boundary conditions, meshes and geometry and is effective tool to simulate even very complicated flow structures in the last stage and exhaust hood.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Flow in the Last Stage of 1090mw Steam Turbine

Hoznedl¹,

Sedlák²

2018

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“…Fine droplets are generated by spontaneous/heterogeneous nucleation in the form of a dense fog. 1–9 Although the fine droplets essentially follow the steam flow, a small proportion deviates from the vapour streamlines and deposits on the stator and rotor blades and casing. The deposited water is drawn towards the trailing edges by the aerodynamic drag force and re-enters the flow in the form of coarse water droplets with diameters in the range from ten to several hundred micrometers.…”

Section: Introductionmentioning

confidence: 99%

Coarse water in low-pressure steam turbines

Cai

Ning

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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A novel integrated probe has been developed and has been applied to measure the amount of coarse water upstream and downstream of a newly designed stage in a model steam turbine, and also downstream of the last stage of a 350 MW low-pressure steam turbine. This paper presents the measurement principles of the probe and the measurement results in the two turbines. The measurements show that the velocity, flow direction, quantity and size of the coarse water droplets over the height of the blades cover a wide range. Based on this fact, a new way to reduce the size of coarse water droplets is proposed. Initial experiments using a model blade with a superhydrophilic surface coating confirmed that smaller droplets were formed.

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“…12, 13 In addition, related problems were also investigated and analysed in numerous recent papers. [14][15][16][17][18][19] The existing knowledge and mathematical models on wet steam flow in steam turbines can now be used with acceptable approximation for detailed CFD evaluation of the droplet nucleation and wet steam energy losses, as well as in aerodynamic optimisation of turbine nozzles and rotor blade rows operating under wet steam conditions. However, at the very beginning of the turbine design process, a simple empirical integral Baumann rule is still the only possibility to account for the additional wet steam energy losses.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 In addition, related problems were also investigated and analysed in numerous recent papers. 14–19…”

Section: Introductionmentioning

confidence: 99%

Wet steam energy loss and related Baumann rule in low pressure steam turbines

Petr

Kolovratník

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents the results of a computational analysis of the wet steam energy loss occurring in a 210 MW fossilfired and a 1000 MW nuclear LP steam turbine. The turbines operate under considerably different conditions as regards pressure level in the droplet nucleation zone, exit moisture level and droplet size spectra determined from optical extinction measurements. An evaluation of the basic wetness energy losses has been carried out including the thermodynamic loss, drag loss of the fine and coarse droplets, impact loss, collected water loss, centrifuging loss and exit loss. A statistical 2D evaluation method has been employed for the computational simulation of the loss. The objective of the analysis was to determine whether an equilibrium based Baumann factor of order 0.6 can be used for predicting the wet steam loss.

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An investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 3: Heterogeneous/homogeneous condensation

Cited by 9 publications

References 5 publications

Experimental and Numerical Research on Flow in the Last Stage of 1090mw Steam Turbine

Experimental and Numerical Research on Flow in the Last Stage of 1090mw Steam Turbine

Coarse water in low-pressure steam turbines

Wet steam energy loss and related Baumann rule in low pressure steam turbines

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