Numerical Simulation and Experimental Investigation on Hydrodynamics Performance of Hybrid CRP Podded Propulsion.

Numerical model of hybrid contra-rotating propeller (CRP) podded propulsion is built in numerical cavitation tunnel, and the hydrodynamics performance of hybrid CRP podded propulsion in uniform flow is predicted by RANS formula with SST k-w turbulence model based on sliding mesh method. The predicted results of open-water performance and unsteady performance of hybrid CRP podded propulsion are analyzed. Synchronously, a series of experimental investigations for open-water performance of hybrid CRP podded propulsion are carried out. Pod dynamical instrument and long-axis dynamical instrument are used in cavitation tunnel of the same size. The repeated tests' results are compared well with each other, indicating that the tests are stable. The average value of the repeated tests' results agree well with the prediction results of open-water performance. It is shown that the experimental method and the numerical method presented in this paper have good precision in the prediction of hybrid CRP podded propulsion's open-water performance. The average value of the repeated tests' results and predicted results are compared with the foreign experimental value of the same CRP without pod. The influence of pod on the open-water performance of the forward propeller and the after one are analyzed. It is shown that pod has no influence basically on open-water performance of the forward propeller, but has an obvious influence on the after one. [ABSTRACT FROM AUTHOR]