Experimental Study on the Three-Dimensional Turbulent Boundary Layer of a Fine Ship Form Expressed by Means of Conformal Mapping

概要

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Measurements of the velocity distributions in the turbulent boundary layer on the after body of a ship model of C_b=0.57, which is expressed by means of conformal mapping, are carried out by use of five-hole spherical probe in the towing tank. The ship model is 8.0m long and Reynolds number is 1.166×10^7. The boundary layer calculations for the ship model are performed by three different methods using the momentum integral equation. The measured velocity profiles and integral parameters are compared with the calculated results. Agreement of the measured and the calculated results is fairly good with respect to the main flow characteristics. However, further researches are necessary even for a finer ship form such as the one used in the present study in order to improve the accuracy of the prediction for the flow near separation and the reversed cross flow. A calculation method, which employs Coles' wall-wake law as the velocity profile family and the entrainment equation for three-dimensional flow as the auxiliary equation, seems to be better than other two method used in the present study.
1978-03-15