Discharge imbalance mitigation in Francis turbine draft-tube bays / S. Tridon in Transactions of the ASME . Journal of fluids engineering, Vol. 134 N° 4 (Avril 2012)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 134 N° 4 (Avril 2012) . - 08 p. Titre : Discharge imbalance mitigation in Francis turbine draft-tube bays Type de document : texte imprimé Auteurs : S. Tridon, Auteur ; S. Barre, Auteur ; G. Ciocan, Auteur Année de publication : 2012 Article en page(s) : 08 p. Langues : Anglais (eng) Mots-clés : draft-tube  power plant  laser doppler velocimetry (LDV) measurements Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Rehabilitation of ageing power plant is a growing market with specific needs: we have to deal with non up-to-date elements in terms of hydraulic behavior. Refurbishment projects are often focused on the guide vane and runner modification. But for low-head refurbishment projects, the draft-tube is a non negligible part of the overall performance. In some cases, pathological draft-tubes have been encountered with a significant efficiency drop near the best efficiency point. Modification of the draft-tube in order to attenuate, and even eliminate, this effect can thus have a real impact on improving the performance of the power plant, and therefore become economically justified (that heavily depends on the addition or removal of material from the draft-tube walls). Laser Doppler Velocimetry (LDV) measurements near draft-tube outlet have been achieved for both original and modified draft-tube. It offers 2D velocity profiles and permits to calculate discharge repartition in each bay. Pressure recovery factor measured separately for each bay is used to quantify losses. Note de contenu : Fluids engineering DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000134000004 [...] [article] Discharge imbalance mitigation in Francis turbine draft-tube bays [texte imprimé] / S. Tridon, Auteur ; S. Barre, Auteur ; G. Ciocan, Auteur . - 2012 . - 08 p. Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 134 N° 4 (Avril 2012) . - 08 p. Mots-clés : draft-tube  power plant  laser doppler velocimetry (LDV) measurements Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Rehabilitation of ageing power plant is a growing market with specific needs: we have to deal with non up-to-date elements in terms of hydraulic behavior. Refurbishment projects are often focused on the guide vane and runner modification. But for low-head refurbishment projects, the draft-tube is a non negligible part of the overall performance. In some cases, pathological draft-tubes have been encountered with a significant efficiency drop near the best efficiency point. Modification of the draft-tube in order to attenuate, and even eliminate, this effect can thus have a real impact on improving the performance of the power plant, and therefore become economically justified (that heavily depends on the addition or removal of material from the draft-tube walls). Laser Doppler Velocimetry (LDV) measurements near draft-tube outlet have been achieved for both original and modified draft-tube. It offers 2D velocity profiles and permits to calculate discharge repartition in each bay. Pressure recovery factor measured separately for each bay is used to quantify losses. Note de contenu : Fluids engineering DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000134000004 [...]

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