{"id":1783,"date":"2026-02-16T15:15:56","date_gmt":"2026-02-16T15:15:56","guid":{"rendered":"https:\/\/hydroalpslab.geekworkers.dev\/?p=1783"},"modified":"2026-02-22T15:20:34","modified_gmt":"2026-02-22T15:20:34","slug":"new-article_daniel","status":"publish","type":"post","link":"https:\/\/hydroalpslab.ch\/en\/nouvel-article_daniel\/","title":{"rendered":"New scientific publication: Better prediction of turbine fatigue"},"content":{"rendered":"

We are pleased to announce the publication of our new scientific article in the journal Results in Engineering<\/strong> :<\/h2>\n\n\n\n

Biner D., Hasmatuchi V., Dujic D., M\u00fcnch-Allign\u00e9 C. (2026)<\/strong>
Fatigue design of Francis-type pump-turbine runners under flexible power generation<\/em>
Available in Open Access from Elsevier : https:\/\/doi.org\/10.1016\/j.rineng.2026.109480<\/a><\/p>\n\n\n\n

Context<\/h3>\n\n\n\n

With the massive integration of intermittent renewable energies, hydroelectric power plants are having to operate more flexibly (frequent start-ups and shutdowns, part-load operation, variable speed). These new operating regimes increase the mechanical stress on turbine wheels and pose major challenges in terms of structural fatigue<\/strong> and lifespan. <\/p>\n\n\n\n

Aims of the study<\/h3>\n\n\n\n

The article proposes an advanced methodology for :<\/p>\n\n\n\n

    \n
  • Better prediction of Francis pump-turbine impeller fatigue<\/li>\n\n\n\n
  • Take account of multiaxial stress conditions<\/li>\n\n\n\n
  • Distinguishing between contributions High Cycle Fatigue (HCF)<\/strong> and Low Cycle Fatigue (LCF)<\/strong><\/li>\n\n\n\n
  • Assessing the impact of start-up sequences<\/li>\n\n\n\n
  • Compare numerical results with experimental measurements on a prototype<\/li>\n<\/ul>\n\n\n\n

    Methodology<\/h3>\n\n\n\n

    The study is based on :<\/p>\n\n\n\n

      \n
    • Unsteady CFD simulations coupled with structural models<\/li>\n\n\n\n
    • A critical plan (scaled normal stress method)<\/strong> for handling multiaxial stress states<\/li>\n\n\n\n
    • A quasi-stationary model for estimating damage for arbitrary operating trajectories<\/li>\n\n\n\n
    • Experimental validation on a 5 MW prototype pump-turbine equipped with a full power converter (FSFC)<\/li>\n<\/ul>\n\n\n\n

      Key results<\/h3>\n\n\n\n
        \n
      • Conventional criteria (Von Mises, principal stress) can lead to unreliable estimates of critical fatigue zones.<\/li>\n\n\n\n
      • The critical plane approach significantly improves the robustness of predictions.<\/li>\n\n\n\n
      • Variable speed operation allows drastic reduction in start-up fatigue damage<\/strong>, This helps to extend the life of equipment.<\/li>\n\n\n\n
      • The model developed enables the impact of advanced control strategies on the mechanical integrity of machines to be quantified.<\/li>\n<\/ul>\n\n\n\n

        Financing<\/h3>\n\n\n\n

        This work is part of the European project XFLEX HYDRO<\/strong> (Horizon 2020).<\/p>\n\n\n\n

        <\/p>","protected":false},"excerpt":{"rendered":"

        Nous avons le plaisir d\u2019annoncer la publication de notre nouvel article scientifique dans la revue Results in Engineering : Biner D., Hasmatuchi V., Dujic D., M\u00fcnch-Allign\u00e9 C. (2026)Fatigue design of Francis-type pump-turbine runners under flexible power generationDisponible en Open Access chez Elsevier : https:\/\/doi.org\/10.1016\/j.rineng.2026.109480 Contexte Avec l\u2019int\u00e9gration massive des \u00e9nergies renouvelables intermittentes, les centrales hydro\u00e9lectriques […]<\/p>\n","protected":false},"author":2,"featured_media":1788,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1783","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite"],"_links":{"self":[{"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/posts\/1783","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/comments?post=1783"}],"version-history":[{"count":3,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/posts\/1783\/revisions"}],"predecessor-version":[{"id":1789,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/posts\/1783\/revisions\/1789"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/media\/1788"}],"wp:attachment":[{"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/media?parent=1783"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/categories?post=1783"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hydroalpslab.ch\/en\/wp-json\/wp\/v2\/tags?post=1783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}