On the application of isogeometric finite volume method in numerical analysis of wet-steam flow through turbine cascades

Hashemian, Ali; Lakzian, Esmail; Ebrahimi-Fizik, Amir

doi:10.1016/j.camwa.2019.09.025

Cited by 32 publications

(16 citation statements)

References 76 publications

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“…The momentum conservation equations for gas and liquid phases are as follows (Hashemian & Lakzian, 2020;Hosseini & Lakzian, 2020;Ramezanizadeh et al, 2019):…”

Section: Model Establishmentmentioning

confidence: 99%

Numerical investigation of the wet steam condensation flow characteristics in stator cascade with blade surface heating

Han

Yuan

Zhao

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The scientific and effective control of steam wetness in steam turbines is of great significance for improving power generation efficiency. Based on the research status of wet steam, the influence of different surface heating intensity in a stator cascade was studied. The distribution of condensation flow parameters in White cascade under 0-700 kW/m 2 surface heating intensity is calculated. On this basis, the positive heating intensity region was determined and refined to obtain the best heating condition with higher accuracy. The results show that the condensation is restrained and the outlet wetness is decreased as the blade surface heating intensity increases. The steam wetness and droplet diameter in the flow field can be controlled by adding heating intensity. Additionally, at the initial stage of applying heat to the blade, an increasing enthalpy drop occurs, and the entropy increase experiences a decline, while negative effects rapidly emerge if the heating intensity is too high. The optimum heating intensity is 120 kW/m 2. Compared with the 0 kW/m 2 , the average outlet wetness, total pressure loss coefficient and entropy increase of 120 kW/m 2 surface heating intensity can be reduced by 1.1266%, 15.5% and 1.7%, respectively, and the enthalpy drop can be increased by 1.7%.

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“…The momentum conservation equations for gas and liquid phases are as follows (Hashemian & Lakzian, 2020;Hosseini & Lakzian, 2020;Ramezanizadeh et al, 2019):…”

Section: Model Establishmentmentioning

confidence: 99%

Numerical investigation of the wet steam condensation flow characteristics in stator cascade with blade surface heating

Han

Yuan

Zhao

et al. 2020

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…Note that since the strain measures and the elastic matrices C and D are expressed in the local frame, the internal forces obtained through Eqs. (16) and (17) are also expressed in the local frame…”

Section: Governing Equations In Strong Formmentioning

confidence: 99%

“…An exhaustive presentation of IGA is found in [8]. The application of IGA is growing fast in many branches of science and engineering, such as, e.g., solid mechanics [9][10][11][12][13], fluid mechanics [14][15][16], electromagnetics [17,18], and eigenvalue problems [19,20].…”

Section: Introductionmentioning

confidence: 99%

Effects of parameterization and knot placement techniques on primal and mixed isogeometric collocation formulations of spatial shear-deformable beams with varying curvature and torsion

Marino

Hosseini

Hashemian

et al. 2020

Computers & Mathematics with Applications

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We present a displacement-based and a mixed isogeometric collocation (IGA-C) formulation for free-form, three-dimensional, shear-deformable beams with high and rapidly-varying curvature and torsion. When such complex shapes are concerned, the approach used to build the IGA geometric model becomes relevant. Although IGA-C has been so far successfully applied to a wide range of problems, the effects that different parameterization and knot placement techniques may have on the accuracy of collocation-based formulations is still an unexplored field. To fill this gap, primal and mixed formulations are used combining two parameterization methods (chord-length and equally spaced) with two knot placement techniques (uniformly spaced and De Boor). With respect to the space-varying Frenet local frame, we derive the strong form of the governing equations in a compact form through the definition of two matrix operators conveniently used to perform first and second order derivatives of the vector fields involved in the formulations. This approach is very efficient and easy to implement within a collocation-based scheme. Several challenging numerical experiments allow to test the different considered parameterizations and knot placement techniques, revealing in particular that with the primal formulation an equally spaced parameterization is definitively the most recommended choice and it should always be used with an approximation degree of, at least, p = 6, although some caution must be adopted when very high

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“…The concept of isogeometric analysis (IGA), first introduced by Hughes et al [1], tries to bridge the gap between CAD and FEA by employing spline basis functions (already used to create CAD geometries) as finite element shape functions. Thanks to the accurate and efficient geometry representation of this framework, IGA has been successfully implemented in various engineering applications such as solid mechanics [2][3][4][5][6], fluid mechanics [7][8][9][10], heat transfer [11,12] and eigenvalue problems [13,14].…”

Section: Introductionmentioning

confidence: 99%

Studies on knot placement techniques for the geometry construction and the accurate simulation of isogeometric spatial curved beams

Hosseini

Hashemian

Reali

2020

Computer Methods in Applied Mechanics and Engineering

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On the application of isogeometric finite volume method in numerical analysis of wet-steam flow through turbine cascades

Cited by 32 publications

References 76 publications

Numerical investigation of the wet steam condensation flow characteristics in stator cascade with blade surface heating

Numerical investigation of the wet steam condensation flow characteristics in stator cascade with blade surface heating

Effects of parameterization and knot placement techniques on primal and mixed isogeometric collocation formulations of spatial shear-deformable beams with varying curvature and torsion

Studies on knot placement techniques for the geometry construction and the accurate simulation of isogeometric spatial curved beams

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