Abstract
The use of energy-saving devices is the most effective method for decreasing CO2 emissions, which is an increasingly concerning environmental issue. The asymmetric pre-swirl stator has been developed as an energy-saving device and has been successfully applied to various types of vessels. In the present study, a flexible material was applied to an asymmetric pre-swirl stator to determine the variation in the flow around stator and its efficiency. A fluid–structure interaction (FSI) analysis system was developed using the Star-CCM+ (fluid) and the Abaqus (structure). The proposed analysis system was validated by comparing the experimental results using a flexible plate in a flowing fluid. The flexible stator was applied to a 3,600 TEU KRISO Container Ship to determine the improvement in its performance compared to the previous optimum value achieved with a rigid stator. Although this application was conducted on a model scale and the deformation was small, the results of the flexible stator indicated the possibility of not only increasing the efficiency but also decreasing the vortex risk around stator blade.
Highlights
Environmental regulations are becoming more significant; the International Maritime Organization (IMO) is reinforcing regulations in the ocean that it had initiated against CO2, NOx, and SOx based on the energy efficiency design index (EEDI) [1]
The velocity distribution of flow in the flexible model can be seen even spanwisely compared to the rigid model as shown in Fig. 14 that is due to a deformation along the radius in flexible case the amount is small
As the velocity difference between the pressure and suction side means the vortex at each radii the more uniformly distributed load of stator seems works better for recovering the rotational flow on the whole than the rigid case
Summary
The use of energy-saving devices is the most effective method for decreasing CO2 emissions, which is an increasingly concerning environmental issue. The asymmetric preswirl stator has been developed as an energy-saving device and has been successfully applied to various types of vessels. A flexible material was applied to an asymmetric pre-swirl stator to determine the variation in the flow around stator and its efficiency. The flexible stator was applied to a 3,600 TEU KRISO Container Ship to determine the improvement in its performance compared to the previous optimum value achieved with a rigid stator. This application was conducted on a model scale and the deformation was small, the results of the flexible stator indicated the possibility of increasing the efficiency and decreasing the vortex risk around stator blade
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