| Titre : | Discharge imbalance mitigation in Francis turbine draft-tube bays (2012) |
| Auteurs : | S. Tridon, Auteur ; S. Barre, Auteur ; G. Ciocan, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of fluids engineering (Vol. 134 N° 4, Avril 2012) |
| Article en page(s) : | 08 p. |
| Langues : | Anglais |
| Index. décimale : | 620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux) |
| Tags : | draft-tube ; power plant ; laser doppler velocimetry (LDV) measurements |
| 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=JFEGA4000134000004041102000001&idtype=cvips&gifs=Yes&ref=no |
