On the performance of a cascade of turbine rotor tip section blading in nucleating steam. Part 1: surface pressure distributions

Bakhtar, F.

doi:10.1016/s0301-9322(97)88548-5

Cited by 22 publications

(37 citation statements)

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“…The geometry under study is a rotor tip section of a steam turbine, taken from [34]. Figure 2 shows this geometry and computational domain between blades.…”

Section: Resultsmentioning

confidence: 99%

“…The boundary conditions for the current numerical simulation have been chosen as identical to those in the experimental test, such as the in ow direction ( ) is 38 and the in ow stagnation pressure Figure 2. Geometry of the rotor-tip section and the computational domain [34], where p is pitch length, C is chord length, is ow angle at the entrance, is stagger angle, and is deviation angle. and temperature are set to 99.9 kPa and 360.8 K, respectively.…”

Section: Validationmentioning

confidence: 99%

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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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“…The geometry under study is a rotor tip section of a steam turbine, taken from [34]. Figure 2 shows this geometry and computational domain between blades.…”

Section: Resultsmentioning

confidence: 99%

Section: Validationmentioning

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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show abstract

“…All the work done in one dimension was used in the preparation of the two-dimensional code, although in two dimensions we are faced with the problems of ÿnding a suitable blade geometry and then constructing a grid. For this part of the work, the two-dimensional model will be compared with experimental data of Bakhtar, 15 where an actual GEC blade geometry is used.…”

Section: Resultsmentioning

confidence: 99%

The flow of wet steam in a one-dimensional nozzle

Mccallum

Hunt

1999

Int. J. Numer. Meth. Engng.

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SUMMARYThe formation of water droplets in a low-pressure steam turbine, seriously degrades the e ciency of the generator. A model has been developed which includes the nucleation and subsequent growth of the droplets as the extra equations to the usual Euler equations for dry steam. A feature of this work is that all the equations are cast in Eulerian form compared to much of the previous work which considered the droplets in Lagrangian form. The ensuing equations are solved using a second-order upwind TVD scheme which can cope with the steep gradients which occur in the solution. The results for a 1-D nozzle are presented and compared with experimental results.

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“…Since the papers published by Bakhtar et al [3][4][5][6][7] are all-sided and systematic in cascade profile data and experimental data, they are cited widely so as to confirm the computation validity of wet steam model for cascade flow.…”

Section: Numerical Simulation Of Wet Steam Flow In Rotor-tip Cascadementioning

confidence: 98%

2D-simulation of wet steam flow in a steam turbine with spontaneous condensation

2007

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Removal of condensates from wet steam flow in the last stages of steam turbines significantly promotes stage efficiency and prevents erosion of rotors. In this paper, homogeneous spontaneous condensation in transonic steam flow in the 2-D rotor-tip section of a stage turbine is investigated. Calculated results agree with experimental data reasonably well. On the basis of the above work, a 2-D numerical simulation of wet steam flow in adjacent root sections of a complex steam turbine stage was carried out. Computational results were analyzed and provide insights into effective removal of humidity.

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On the performance of a cascade of turbine rotor tip section blading in nucleating steam. Part 1: surface pressure distributions

Cited by 22 publications

References 0 publications

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

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

The flow of wet steam in a one-dimensional nozzle

2D-simulation of wet steam flow in a steam turbine with spontaneous condensation

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