An attempt to make a reliable assessment of the wet steam flow field in the de Laval nozzle

Dykas, Sławomir; Majkut, Mirosław; Smołka, Krystian; Strozik, Michał

doi:10.1007/s00231-018-2313-7

Cited by 16 publications

(9 citation statements)

References 13 publications

(19 reference statements)

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“…For this purpose, the X probe was used to tests carried out in a research steam tunnel located in the IMiUE Thermal Machinery Hall, used for a wide spectrum of steam flow tests, using various types of nozzles and blade channels. Research using the installation has been extensively described in publications over the last several years [14][15][16]. To carry out the tests, a measuring nozzle with the geometry shown in the figure 9, [14], and the Ansys CFX software were used.…”

Section: Determination Of the Wetness And The Diameter Of The Dropletmentioning

confidence: 99%

“…Research using the installation has been extensively described in publications over the last several years [14][15][16]. To carry out the tests, a measuring nozzle with the geometry shown in the figure 9, [14], and the Ansys CFX software were used. Solver© s criteria and other relevant code settings have been set in accordance with Ansys recommendation for wet steam flow calculations, and detailed description of the model used, can be found in the literature [30].…”

Section: Determination Of the Wetness And The Diameter Of The Dropletmentioning

confidence: 99%

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Identification of the liquid mass fraction content in the wet steam

et al. 2019

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The experimental research, initiated at the Institute of Power Engineering and Turbomachinery of the Silesian University of Technology at the end of the last century, created an opportunity to supplement knowledge about the phenomenon of steam flow with condensation, tested by numerical fluid mechanics by IMiUE employees. In parallel with the numerical work, significant progress has been made in experimental studies on thflow of wet steam. Recently, measuring techniques based on recording the phenomenon of extinction of light have been elaborated or improved. The basic value determined in the final stage in the experimental way was the contentof the liquid phase defined as the wetness fraction. The methodology of tests and experimental investigations was presented, as well as the applied and developed measurement systems. Next, some developed designs of X probe and their modifications are described. Article present also some examples of applications of the developed measurement techniques in application to experimental research conducted on wet steam in the IMiUE. Examples of comparison between experimental and numerical tests are also provided.

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Section: Determination Of the Wetness And The Diameter Of The Dropletmentioning

confidence: 99%

Section: Determination Of the Wetness And The Diameter Of The Dropletmentioning

confidence: 99%

Identification of the liquid mass fraction content in the wet steam

et al. 2019

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“…20,20 Dykas et al. 22 found that there are significant differences between the numerical results and experimental results in the de Laval nozzle. The International Wet Steam Modeling Project comparatively studied the numerical simulation results of numerous wet-steam methods in the nozzle, and compared them with experimental data of several nozzle test cases.…”

Section: Introductionmentioning

confidence: 98%

Condensation flow at the wet steam centrifugal turbine stage

Liu

Shi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper investigates spontaneous condensation of wet steam in a centrifugal turbine by means of three-dimensional computational fluid dynamics. The flow field and aerodynamic characteristics of the wet steam in the centrifugal turbine are compared and analyzed by using the equilibrium steam and nonequilibrium steam models, respectively, where the latter applies the classical droplet nucleation theory and neglects velocity slip between the liquid phase and the gaseous phase. The state parameters of wet steam are described here based on the IAPWS’97 formulation. It is concluded that under the design condition, the mass flow rate, wetness fraction, and flow angle of the wet steam centrifugal turbine in the nonequilibrium steam model all change compared with the equilibrium steam model, with values of 4.4%, 0.5%, and 10.57%, respectively. Then the performance variation of the wet steam centrifugal turbine is analyzed under different steam conditions and different outlet back-pressure conditions. The results show that the change law of the mass flow rate, shaft power, and wetness fraction in the centrifugal turbine are basically identical in both models, and the mass flow rate, shaft power, wheel efficiency, and entropy loss coefficient of the centrifugal turbine in the nonequilibrium steam model are all higher than those in the equilibrium steam model, whereas the outlet wetness fraction is lower than that in the equilibrium steam model.

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“…The light extinction method for estimating the liquid mass fraction in the wet steam area, is utilized in experimental studies on the steam tunnel test rig at the Silesian University of Technology's Department of Power Engineering and Turbomachinery [1]. Measuring systems based on light extinction principle were tested with the results of similar solutions from several large research centers [2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Liquid Phase Identification in Wet Steam Transonic Flows by Means of Measurement Methods

Shabani

Majkut²,

Dykas³

et al. 2022

J. Phys.: Conf. Ser.

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The major goal of this study is comparing the results of heterogeneous and homogeneous condensation through a CD nozzle. The experimental technique for liquid phase assessment in wet steam transonic flow is tested under real conditions in an in-house steam tunnel test rig. The flow was modelled numerically using an in-house CFD code for performing the heterogeneous and homogeneous condensation models. For the comparison between CFD results and experimental data, the static pressure distribution throughout the nozzle bottom wall were chosen. One may observe a good agreement of the CFD results with experimental data. The presented approach can be used in the future for searching the reasons for the lack of accuracy between experimental and numerical static pressure distribution in the condensing steam flows.

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An attempt to make a reliable assessment of the wet steam flow field in the de Laval nozzle

Cited by 16 publications

References 13 publications

Identification of the liquid mass fraction content in the wet steam

Identification of the liquid mass fraction content in the wet steam

Condensation flow at the wet steam centrifugal turbine stage

Liquid Phase Identification in Wet Steam Transonic Flows by Means of Measurement Methods

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