||Flutter in collapsible tubes at turbulent and laminar flow regimes
Zayko, Julia ,
Yushutin, VladimirVedeneev, Vasily
宇宙航空研究開発機構特別資料=JAXA Special Publication: Proceedings of the First International Symposium on Flutter and its Application
348 , 2017-03-15 , Japan Aerospace Exploration Agency (JAXA) , 宇宙航空研究開発機構(JAXA)
Stability and self-exciting oscillations of elastic tubes conveying fluid are investigated at laminar and turbulent flow regimes. We experimentally analyze the effect of the flow regime (laminar vs turbulent) on the limit cycle properties and the flow rate limitation. The influence of the fluid viscosity on these characteristics at turbulent regimes is also explored. Maps of regimes (pressure drop/flow rate relations) are obtained. It is shown that the stability boundary does not significantly depend on the fluid viscosity at turbulent regime. The stability boundary at the same flow rates corresponds to less pressure drops for laminar regimes then for turbulent regimes. The frequency for different regimes of oscillations does not change much when changing the pressure drop in turbulent case, and essentially depends on the pressure drop in laminar case. Measurements also reveal that the amplitude of observed oscillations is essentially higher for the turbulent flow through the collapsible tube than for the laminar flow.
Meeting Information: First International Symposium on Flutter and its Application (May 15-17, 2016. Mielparque-tokyo), Minato-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations