000213004 001__ 213004
000213004 005__ 20190317000313.0
000213004 037__ $$aCONF
000213004 245__ $$aComparison of chute aerator effect on stepped and smooth spillways
000213004 269__ $$a2015
000213004 260__ $$c2015
000213004 336__ $$aConference Papers
000213004 500__ $$a[1045]
000213004 520__ $$aBottom chute aerators are installed to prevent cavitation damages and they have been studied in detail on smooth spillways. In parallel, stepped spillways became widespread in the past decades. Research has shown that stepped spillways may be endangered even more by cavitation than smooth spillways, particularly for high unit discharges. As a consequence and besides issues of energy dissipation, the unit discharge of stepped spillways is usually limited to lower values than on smooth spillways. In order to overcome that limitation, flow aeration – mainly at the beginning of the chute – is necessary. Until now only fragmentary guidelines exists for the design of such aerators. Systematic tests with bottom chute aerators on stepped spillway are performed on a physical model. A deflector is used to separate the jet from the bottom in order to produce slight negative air pressures. A horizontal slot located in the vertical face of the first step allows for air supply underneath the flow. In addition of the global air entrainment by the aerator, the local air concentrations are spatially measured downstream of the deflector. The resulting air concentration distribution allows the investigation of air transport and detrainment as well as the streamwise average and bottom air concentration. The present paper discusses a test with a typical aerator and compares it with a reference test without aerator and a test on a smooth chute with a similar aerator.
000213004 6531_ $$aAeration
000213004 6531_ $$aAir concentration
000213004 6531_ $$aAir entrainment
000213004 6531_ $$aCavitation
000213004 6531_ $$aStepped spillway
000213004 700__ $$aTerrier, Stéphane
000213004 700__ $$0244418$$g202221$$aPfister, Michael
000213004 700__ $$aSchleiss, Anton$$g112841$$0241228
000213004 7112_ $$dJune 19- July 3, 2015$$cThe Hague, The Netherlands$$aIAHR 2015
000213004 773__ $$jon-line version$$tProc. of Int. Congress IAHR 2015
000213004 8564_ $$uhttps://infoscience.epfl.ch/record/213004/files/2015-1045_Terrier_Pfister_Schleiss_Comparison%20of%20chute%20aerator%20effect%20on%20stepped%20and%20smooth%20spillways.pdf$$zn/a$$s638158$$yn/a
000213004 909C0 $$xU10263$$0252079$$pLCH
000213004 909C0 $$pPL-LCH$$xU10263$$0255473
000213004 909CO $$qGLOBAL_SET$$pconf$$pENAC$$ooai:infoscience.tind.io:213004
000213004 917Z8 $$x246105
000213004 937__ $$aEPFL-CONF-213004
000213004 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000213004 980__ $$aCONF