Effect of the Joint Shape on the Coming out of the Shaft from the Shrinkly Fitted Ceramic Sleeve During Rotation (original) (raw)
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Vortex induced vibration is caused by the fluidic interaction in a circular cylinder ． This phenomenon is influenced by the flow around the circular cylinder and vortex motions in this wake ． In order to control this phenomenon， the suppression ofthe vortex shedding generated from a circular cylinder is conducted by the attaching spherica ］rings ． ［ n this paper， the fiow behavior in the wake and the drag coe 伍 cients is measurcd using X type hotwire anemometer and three − components balance ． As these results ， the wake width and the drag coe 伍 cients decrease due to the flow toward the center ofthe cylinder behind these rings ． Key 〃Words ： passive control ， Circular Cylinder ， Wake ， Drag coethcients
The Proceedings of the Fluids engineering conference, 2012
The rotordynamic fiuid forces on a closed Wpe ce ロ tri 魚 ga 且impeller in whirli 皿 g motion were measured and simulated for tWo types of seal ， a face seal and a weat ring seal ． The rotordynarnic fluid forees are destabilizing in the ranges of Oく aw く 0． 5 fbr the face sea1 and O くato for the wear ring seal ， where ∫ n and ω are a whirling speed and a rotational speed of 血e sha 丘， respeCtively ． The characteristics ofthe rotordynamic fluid丘)rces could be u咀derstood in consideration of a squeeze effeCt and the change of resistance of seal due to the eccentricity of the impeUer fbr a swirling fiow in the clearance between the front shroud of the impeller and the casing ． In a low 且ow rate ， a rotating sta 耻 occurred and changed the rotordynamic fiuid fbrce drastically around 9 ω ＝ 0． 7 最) r the face seal ， 0． 6＜ρ ω く0 ． 9 fbr 重 he wear ring seal ． Key Mfoκds：Pump ， Rotordynamic Fluid Force ， Seal ， Unsteady Flow
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