Revista HIDRAULICA | HIDRAULICA Magazine

ISSN 2343–7707 ; ISSN-L 1453-7303

Here below we post a list of
Papers already accepted for publication in Issue 3/2018 of HIDRAULICA.
The list displays paper title, author(s) and affiliation,
and also paper abstract.
Full-text paper will be available online only after publication.

  • Studying Transients in Water Supply Systems
    Zoltán CSONGRÁDI1, Nikolett FECSER2, Bálint LAJTAI3

    1PANNON-VÍZ Zrt., Országút u., Győr, Hungary
    2Széchenyi István University, 1 Egyetem tér, Győr, Hungary
    3VAG Armaturen Hungary, Madarász Viktor str., Budapest, Hungary

    Abstract:
    Transient operating states occur in water supply systems under pressure. Transient operating states place such extreme loads on the pipes that they might cause burst water pipes, so to be able to avoid damages and operation failures due to burst pipes they are needed to be studied and modelled. To highlight the importance of transient phenomena, we present the measurements carried out at Pannon-Víz Zrt (the local Hungarian Water Utility Service) and their results in our study.



    The Influence of Corrosion and Temperature Variation on the Minimum Safety Factor of a 3D Hexagonal Toroid with Regular Hexagonal Cross-Section Used in Manufacturing of LPG Storage Tank

    Assoc. Prof. PhD. Eng. Mihai ŢĂLU1, Assoc. Prof. PhD. Eng. Ștefan ŢĂLU2

    1University of Craiova, Romania
    2Technical University of Cluj-Napoca, Romania

    Abstract:
    In this paper we investigate the minimum safety factor (SF) values of a three-dimensional (3D) hexagonal toroid with regular hexagonal cross-section used in manufacturing of LPG storage tanks from the automotive industry. A design strategy was proposed to determine SF according to manufacturing objectives due to the influence of corrosion and temperature variation. Numerical simulations were carried out to determine the surfaces or curves for which the SF has the minimum values and the corresponding variation laws were computed by polynomial interpolation. We coupled numerical simulations of a 3D model (done in the AutoCAD Autodesk 2017 software, which was imported for analysis to SolidWorks 2017 software) with numerical limit analysis to calculate confidence intervals of the safety factor. The results of analyzed cases advocate the need for implementing a reliability improvement program of toroidal LPG fuel tanks.



    The Influence of Corrosion and Pressure Variation on the Minimum Safety Factor of a 3D Hexagonal Toroid with Regular Hexagonal Cross-Section Used in Manufacturing of LPG Storage Tanks
    Assoc. Prof. PhD. Eng. Ștefan ŢĂLU1, Assoc. Prof. PhD. Eng. Mihai ŢĂLU2
    1Technical University of Cluj-Napoca, Romania
    2University of Craiova, Romania

    Abstract:
    This research was aimed to explore the minimum safety factor (SF) values of a three-dimensional (3D) hexagonal toroid with regular hexagonal cross-section used in manufacturing of LPG storage tanks from the automotive industry. Numerical simulations had been carried out to assess the influence of the corrosion and pressure variation on the minimum safety factor values. A polynomial interpolation was applied to provide a comparison between the surfaces or curves for which the SF has the minimum values. The development of the parametric 3D model (done in the AutoCAD Autodesk 2017 software, which was imported for analysis to SolidWorks 2017 software) on the actual conditions of the structure provides the decision-maker with the information necessary for making high-consequence decisions. The results of this study offer a fundamental understanding of the corrosion behavior of LPG storage tanks in exploatation environments.


    Operating Equations of a Rotating Machine that Drives Fluids
    Drd. Almaslamani Ammar FADHIL1, Prof. Dr. Eng. Nicolae BĂRAN1
    1Politehnica University of Bucharest, Romania

    Abstract:
    The paper contains originality elements regarding both the constructive solution of the rotating machine and its functional equations. There are theoretical aspects regarding the fluid handling with this new type of rotating machine with profiled rotors. The end of the paper presents the operating equations and the advantages of using this new type of rotating machine.


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