انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 2 2011 08 23 Annular Aerators in Tunnels with Horse shoe section هواده های حلقوی در تونل های نعل اسبی 87 100 85498 10.30482/jhyd.2011.85498 FA محمدجواد استاد میرزا امیررضا زراتی رضا روشن خداداد صفوی حامد سرکرده 0000-0003-2136-0868 Journal Article 2011 03 23 Aeration is one of the most practical and economical methods for prevention of cavitation attack in<br />high speed flows. Many research works are conducted on aerators. Although a general method is not<br />available for aerator design, many aerators are designed and constructed all over the world. Cavitation<br />danger in tunnels also makes the designers to consider aerators for tunnels. Since tunnel sections are<br />usually circular or horse shoe, a specific type of aerator is required for tunnels. Lack of information on<br />application of aerators in tunnels makes some of designers to change the tunnel section to rectangular<br />by subsequent concrete operation and then design the same type of aerators used in spillways. This<br />method is expensive and time consuming. In the present work, annular aerators are studied in a<br />physical model of a tunnel with horse shoe section. The effect of aerator geometry on jet length and<br />spray formation is studied. Experimental results showed that to reduce spray formation, the aerator<br />geometry should follow the tunnel section. It was also concluded that to reduce spray formation in the<br />range of Froude numbers tested, it is better to keep the ramp angle less than 5 degrees. To increase the<br />jet length and efficiency of the aerator, the ramp height should also be increased. https://jhyd.iha.ir/article_85498_3874d8e818fd9895e988f0dbc45605bb.pdf