Numerical modeling of two-phase transonic flow

Halama, Jan; Benkhaldoun, Fayssal; Fořt, Jaroslav

doi:10.1016/j.matcom.2009.02.004

Cited by 10 publications

(10 citation statements)

References 7 publications

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“…For dq > 0, using Eq. (19), it is concluded that the sonic line (M = 1) occurs downstream of the throat (in the diverging portion of the nozzle where dA > 0).…”

Section: E Ects Of Outlet Pressure Variations Onmentioning

confidence: 98%

“…Also, according to Eq. (19), it can be seen that the Mach number distribution corresponds to the value of latent heat (dq > 0) and area variation (dA) in the passage.…”

Section: E Ects Of Outlet Pressure Variations Onmentioning

confidence: 99%

“…In 2007, Gerber and Mousavi [18] investigated the effectiveness of the Quadrature Method Of Moments (QMOM) in representing droplet size distributions present in the low-pressure steam turbine stages. Halama et al [19] used an in-house code for simulating two-phase condensing steam by adding Giles's matching algorithm using Lax-Wendro method.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…For dq > 0, using Eq. (19), it is concluded that the sonic line (M = 1) occurs downstream of the throat (in the diverging portion of the nozzle where dA > 0).…”

Section: E Ects Of Outlet Pressure Variations Onmentioning

confidence: 98%

“…Also, according to Eq. (19), it can be seen that the Mach number distribution corresponds to the value of latent heat (dq > 0) and area variation (dA) in the passage.…”

Section: E Ects Of Outlet Pressure Variations Onmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Esfe¹,

Kermani²,

Saffar‐Avval³

2017

Scientia Iranica

View full text Add to dashboard Cite

show abstract

“…The governing equations for quasi one-dimensional flow in full conservative form consist of Euler equations for the mixture and four additional partial differential equations describing the condensate formation [6,7,17,20]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…Luo et al [6] have done one dimensional calculations for spontaneously nucleating flows of steam by space-time CESE method. Halama et al [7,8] have done some numerical studies on steady and unsteady condensing/evaporating steam flow in nozzles and cascades of steam turbines. Recently Dykas and Wroblewski [9] have performed some numerical computations for condensing steam flow in low and high pressure nozzles.…”

Section: Introductionmentioning

confidence: 99%