Device and method for inhibiting vortex-induced vibration of spiral strake with rotating blade
A technology of spiral strakes and suppression devices, which is applied in earthwork drilling, fluid flow, and reduction of ship motion, can solve the problems of vortex-induced vibration suppression effect to be further improved, increase riser drag force, etc., and achieve the best suppression effect , low-cost effect
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[0026] According to the slenderness ratio of the actual ocean riser and the perennial statistical information of local ocean waves and currents, a reasonable basic unit spacing is designed, and the required basic unit number n is calculated, that is, the sleeve with spiral strake 2 and support 3. The number of 1 is n, the number of blades 4 is 6n, and the number of screw 6 and nut 7 is 3n.
[0027] When installing a single basic unit, first set the sleeve 1 to a suitable position on the riser, and then place the two blades 4 between the supports 3 on the same vertical line, and make the blade shaft hole 5 and the support The shaft holes of 3 are aligned, and the screw 6 passes through the shaft holes of the three supports 3 on the vertical line and the blade shaft holes 5 of the two blades 4 between the three supports 3 from top to bottom, and the thread at one end of the screw 6 The nut 7 is engaged and fixed. At this point, the installation of the two bla...
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