| Titre : | Effect of J-groove on the suppression of swirl flow in a conical diffuser (2010) |
| Auteurs : | Junichi Kurokawa, Auteur ; Hiroshi Imamura, Auteur ; Young-Do Choi, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of fluids engineering (Vol. 132 N° 7, Juillet 2010) |
| Article en page(s) : | 08 p. |
| Note générale : | fluids engineering |
| Langues : | Anglais |
| Tags : | pressure ; flow (dynamics) ; diffusers |
| Résumé : | The purpose of this study is to examine the validity of J-grooves in controlling and suppressing the swirl flow in a conical diffuser, for draft surge suppression in a Francis turbine, which is caused by the swirl flow from the runner outlet into the draft tube. “J-groove” composed of shallow grooves and mounted parallel to the pressure gradient on the diffuser wall is a very simple passive device to suppress several abnormal phenomena in turbomachinery. The experimental study has been performed using the conical diffuser with a divergent angle of 20 deg. The measured results of the velocity distribution in the diffuser show that a considerable reduction in the swirl intensity is attained by using J-grooves. Besides, the amplitude of pressure fluctuation caused by the rotation of the vortex core around the dead water region near the diffuser inlet is reduced by J-grooves. |
| DEWEY : | 620.1 |
| ISSN : | 0098-2202 |
| En ligne : | http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122&issueid=27423 |
