Abstract
In this study, particle image velocimetry was used to measure the fine flow-field characteristics of an L-type podded propulsor in various working conditions. The flow-field details at different cross-sections between the propeller and the inclined bracket were compared and analyzed, allowing for more intuitive comparison of the flow-field characteristics of L-type podded propulsors. The interference mechanisms among the propeller, pod, and bracket of the L-type podded propulsors at different advance coefficients, deflection angles, and deflection directions were investigated in depth. The results of this study can serve as reference material and provide technical support for the design and practical shipbuilding application of L-type podded propulsors. Therefore, the results have theoretical significance and practical engineering value.
Highlights
The traditional equipment for measuring propeller thrust and torque is an open water dynamometer
Based on the autonomously developed podded propulsor model, open water performance was investigated in this study while using the fine flow-field measurement technique and the interference mechanism between the bracket and propeller was explored from a microscopic flow-field perspective
J is the advance coefficient of the propeller and β is the deflection angle of the podded propulsor
Summary
The traditional equipment for measuring propeller thrust and torque is an open water dynamometer. Shen et al [9,10,11] conducted a series of experiments on the podded propulsors in a towing tank and cavitation tunnel and documented the effects of the Reynolds number of the propellers, hub-pod gap, and bracket gap on the open water performances of the podded propulsors. Stettler et al [14] explored the quasi-steady and dynamic maneuverability of the podded propulsors with model experiments and measured the wake flow-fields of podded propulsors while using PIV Their experiments showed that the thrust and normal force that are generated by the podded propulsor are approximately linear with respect to the rudder angle in a certain range near the designed advance velocity. Based on the autonomously developed podded propulsor model, open water performance was investigated in this study while using the fine flow-field measurement technique and the interference mechanism between the bracket and propeller was explored from a microscopic flow-field perspective
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