RT Journal Article ID 3008268e24744144 A1 Litvinov, Ivan A1 Naumov, I. V. A1 Okulov, V. L. A1 Mikkelsen, R. F. T1 COMPARISON OF FAR WAKES BEHIND A SOLID DISK AND A THREE-BLADE ROTOR JF Journal of Flow Visualization and Image Processing JO JFV YR 2015 FD 2016-12-01 VO 22 IS 4 SP 175 OP 183 K1 far wake K1 disk K1 three-blade rotor K1 velocity defi cit AB A comparison of the wakes developed behind an immobile bluff body (solid disk) and a three-blade rotor at different rotational speeds is studied to find a correlation between them. LDA and PIV were applied to study the wakes behind both models in a water flume (Re ≈ 2.3·105). Everywhere in both wakes, a constant value of the Strouhal number was found to be equal to 0.23 for a three-blade rotor and 0.15 for a solid disk. This Strouhal number is in good agreement with the constants that usually characterize the wake oscillations behind immobile bluff bodies. The comparison of axial velocity deficit and rms of the velocity in both far wakes for the disk or the rotor shows a rational decay with the same power −2/3. It has good agreement with the analytical formula for the decay of the velocity deficit behind bluff bodies. A limit for using this model restricted by the turbulence level of the initial free flow was found experimentally. PB Begell House LK https://www.dl.begellhouse.com/journals/52b74bd3689ab10b,411ee2db0e163ee3,3008268e24744144.html