Fiber Bragg grating tether used to measure drag forces in neutral buoyancy flow tank tests.
The drag exerted on neutrally buoyant tethered spheres in a flow tank was measured as a function of flow rate. A unique solution to the problem was achieved using an optical fiber including a Bragg grating sensor as part of the tether. Measurements of the strain on the tether taken at flow rates between 0.14 and 0.33 m/s, were used to determine drag forces for spheres with diameters ranging from 40 to 100 mm. Vortex-induced vibration was observed in tests performed at Reynolds numbers from 5 x 10(3) to 4.5 x 10(4). The drag coefficients for these tests were found to range from 0.51 to 0.77.
Wade
S A
SA
Department of Mechanical Engineering, Monash University, Clayton, Victoria, Australia.
Jolley
W
W
Fouras
A
A