Condensation phenomena in a turbine blade passage

Skillings, S. A.

doi:10.1017/s0022112089000716

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…Fine droplets are the main part of the water fraction or wetness [4] and its size is usually less than Fig. 1 The principle of light extinction about 2 µm according to the theory of spontaneous nucleation [5,6]. To measure such fine droplets, the multi-wavelength light extinction method [7] is adopted and its principle is shown in Fig.…”

Section: Measurement Principlementioning

confidence: 99%

Investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 1: Measurement principles, probe, and wetness

Cai

Ning

Niu

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part A:

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The direct air-cooling steam turbines have been operated more and more in the north of China. The backpressure of a turbine is affected easily with weather and varies very often in a short time. The variation of backpressure in a larger range from about 10 to 60 kPa causes many problems in design and operation of the turbine. To study the properties of the wet steam flow in the low pressure direct air-cooling steam turbine, an optical-pneumatic probe was developed based on the multi-wavelength light extinction and four-hole wedge probe. Measurements with this probe in a 300 MW direct air-cooling turbine were carried out. The measured local wetness, total wetness of exhaust steam, size distribution of fine droplets, and their profiles along the blade height are presented. The measured cylinder efficiency and total wetness agree well with the results obtained by the thermal performance tests.

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Section: Measurement Principlementioning

confidence: 99%

Investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 1: Measurement principles, probe, and wetness

Cai

Ning

Niu

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…Moore et al [4] performed one of the earliest experiments related to condensation in nozzles. Then, some experiments were performed on a cascade of turbine to study the phenomena associated with spontaneous condensation by Skillings [5,6]. He studied the e ects of inlet superheating and outlet Mach number on the trailing edge shock structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade

Esfe¹,

Kermani²,

Saffar‐Avval³

2017

Scientia Iranica

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Abstract. In the present paper, an in-house CFD code is developed using Roe scheme to simulate a condensing two-phase ow in blade to blade passage of a steam turbine. E ects of condensation on the ow eld of steam turbine rotor tip section are investigated for di erent outlet pressures. Firstly, comparison is performed between results of wet and dry cases. Then, e ects of outlet pressure variations on the ow eld are studied. Finally, e ects of condensation on di erent speci cations of the ow eld (total pressure loss coe cient, entropy generation, and deviation angle) are investigated. Also, the mechanism of ow deviation in the cascade ow eld is described. Condensation has a great in uence on the behavior of the ow eld based on the numerical results of this paper. It changes the out ow direction, and consequently the ow entering to the next blade deviates from its on-design condition; thus, additional losses are produced. For example, the value of deviation angle reaches 7:62 for wet case and exit Mach number M e = 1:45. Also, there are stagnation pressure loss and entropy generation due to non-equilibrium condensation that reduce the e ciency of the steam turbine.

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“…Moore et al (1973) performed one of the earliest experiments related to condensation in nozzles. Then some experiments were performed on a cascade of turbine to study the phenomena associated with spontaneous condensation by Skillings (1987Skillings ( , 1989. He studied the effects of inlet superheating and outlet Mach number on the trailing edge shock structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines

Esfe¹,

Kermani²,

Saffar‐Avval³

2016

JAFM

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In this paper, effects of non-equilibrium condensation on deviation angle and performance losses of wet stages of steam turbines are investigated. The AUSM-van Leer hybrid scheme is used to solve the two-phase turbulent transonic steam flow around a turbine rotor tip section. The dominant solver of the computational domain is the non-diffusive AUSM scheme (1993), while a smooth transition from AUSM in regions with large gradients (e.g. in and around condensation-and aerodynamic-shocks) to the diffusive scheme by van Leer (1979) guarantees a robust hybrid scheme throughout the domain. The steam is assumed to obey nonequilibrium thermodynamic model, in which abrupt formation of liquid droplets produces a condensation shock. To validate the results, the experimental data by Bakhtar et al. (1995) has been used. It is observed that as a result of condensation, the aerothermodymics of the flow field changes. For example for supersonic wet case with back pressure Pb=30 kPa, the deviation angle and total pressure loss coefficient change by 65% and 200%, respectively, with respect to that in dry case.

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Condensation phenomena in a turbine blade passage

Cited by 7 publications

References 8 publications

Investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 1: Measurement principles, probe, and wetness

Investigation of wet steam flow in a 300 MW direct air-cooling steam turbine. Part 1: Measurement principles, probe, and wetness

Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade

Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines

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