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 marine riser and the perennial statistical information of local ocean waves and currents, a reasonable basic unit spacing is designed, and the required number of basic units n is calculated, that is, the sleeve with the spiral strake 2 and the support 3 The number of 1 is n, the number of 4 blades is 6n, the number of 6 screws and 7 nuts is 3n.
[0027] When installing a single basic unit, first set the sleeve 1 and fix it at a suitable position on the standpipe, then take two blades 4 and place them between the supports 3 on the same vertical line, and make the blade shaft holes 5 and the supports The shaft holes of 3 are aligned, and the screw rod 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 screw thread at one end of the screw rod 6 It is fixed by the engagement of nut 7. So far, th...
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