In this paper, authors have developed an estimation method for deformed blade shape of flexible c... more In this paper, authors have developed an estimation method for deformed blade shape of flexible composite marine propellers. The authors have recently developed a 3D shape measurement system using Combination line CCD camera method and confirmed that the system can measure deformation of a model propeller with enough accuracy. However, in order to utilize the results of the deformation measurement as verification data for fluid structure interaction calculation, not only the amount of deformation, but the deformed 3D blade shape is necessary. The authors focus on a feature that the deformed blade shape can be represented by the position change of the wing section and developed an estimation method for the deformed blade shape by image-registration. For verification of the system’s effectiveness, model experiments were conducted in the NMRI’s large cavitation tunnel using the highly skewed propeller of a training ship “Seiun-Maru-I”. Comparing the results of experiments and numerical...
In this paper, authors have developed an estimation method for deformed blade shape of flexible c... more In this paper, authors have developed an estimation method for deformed blade shape of flexible composite marine propellers. The authors have recently developed a 3D shape measurement system using Combination line CCD camera method and confirmed that the system can measure deformation of a model propeller with enough accuracy. However, in order to utilize the results of the deformation measurement as verification data for fluid structure interaction calculation, not only the amount of deformation, but the deformed 3D blade shape is necessary. The authors focus on a feature that the deformed blade shape can be represented by the position change of the wing section and developed an estimation method for the deformed blade shape by image-registration. For verification of the system’s effectiveness, model experiments were conducted in the NMRI’s large cavitation tunnel using the highly skewed propeller of a training ship “Seiun-Maru-I”. Comparing the results of experiments and numerical...
Recently, applying a composite material to ship propellers is considered. A phenomenon of the com... more Recently, applying a composite material to ship propellers is considered. A phenomenon of the composite material propeller is to deform elastically while a propeller rotating. Using this phenomenon, the design of a new concept propeller which is a high efficiency and reduces a cavitation by adapting to ship wake is studied. This present paper will describe the composite propeller performances (propeller characteristics and cavitation performance) under the elastic deformation. The several model propellers with the different Young’s modulas are made. In order to confirm the propeller characteristics and the cavitation performance of these propellers, the model tests are carried out in a cavitation tunnel of Akishima Laboratories (MITSUI ZOSEN) Inc. The thrust and torque of these propellers deforming elastically are measured, and are compared with the propeller characteristics of a propeller made by aluminum not to deform. And in order to evaluate the cavitation, the fluctuating press...
In this paper, the result of investigation of a high efficient propeller shape in complicated wak... more In this paper, the result of investigation of a high efficient propeller shape in complicated wake distribution generated by a stern duct which is one of energy saving devices is presented. So far, authors have introduced a propeller optimum design system [1] combining Computational Fluid Dynamics analysis, design of experiments, response surface method and genetic algorithm. However, it was limited to performing shape optimization in a uniform flow, and operating point of the propeller, that is, relationship between propeller rotation and engine output is not taken into account. Therefore, in this paper, authors firstly improve the system so that these relationships which are essential for the actual propeller design are taken into account. Secondly authors enabled shape optimization both in uniform flow and in a wake distribution at the same time. The pitch distribution and the maximum camber distribution in the radial direction of the propeller are adopted as the design variables...
Reduction of greenhouse gas (CO2 etc) emission is an important issue to address global warming. I... more Reduction of greenhouse gas (CO2 etc) emission is an important issue to address global warming. In recent ship design, it is essential to improve propulsive performance and fuel oil consumption, and the demand for high-efficiency propeller is growing rapidly. The authors have been investigating the possibility of the application of CFD to the propeller performance evaluation and optimization. In these previous papers[1,2], the authors presented CFD simulation of non-cavitating and cavitating flow around a marine propeller using a commercial CFD code. A good agreement with the experiment was confirmed for the non-cavitating flow. Various validations were also carried out for the cavitating flow, and the followings were described. First, we confirmed that the cavity shape in a uniform flow was qualitatively well estimated, but the difference between two propellers, of which the blade sections were somewhat different, were not reproduced. Secondary, the cavity shape in the non-uniform ...
... The newly designed ducted propeller is equipped for Z-peller of Niigata Power Systems Co., ... more ... The newly designed ducted propeller is equipped for Z-peller of Niigata Power Systems Co., Ltd as a propulsor of a tugboat, and the full-scale bollard pull test is conducted in the actual field. ... 0 Figure 12 Model Test Results of Bollard Pull Efficiency ...
In this paper, authors have developed an estimation method for deformed blade shape of flexible c... more In this paper, authors have developed an estimation method for deformed blade shape of flexible composite marine propellers. The authors have recently developed a 3D shape measurement system using Combination line CCD camera method and confirmed that the system can measure deformation of a model propeller with enough accuracy. However, in order to utilize the results of the deformation measurement as verification data for fluid structure interaction calculation, not only the amount of deformation, but the deformed 3D blade shape is necessary. The authors focus on a feature that the deformed blade shape can be represented by the position change of the wing section and developed an estimation method for the deformed blade shape by image-registration. For verification of the system’s effectiveness, model experiments were conducted in the NMRI’s large cavitation tunnel using the highly skewed propeller of a training ship “Seiun-Maru-I”. Comparing the results of experiments and numerical...
In this paper, authors have developed an estimation method for deformed blade shape of flexible c... more In this paper, authors have developed an estimation method for deformed blade shape of flexible composite marine propellers. The authors have recently developed a 3D shape measurement system using Combination line CCD camera method and confirmed that the system can measure deformation of a model propeller with enough accuracy. However, in order to utilize the results of the deformation measurement as verification data for fluid structure interaction calculation, not only the amount of deformation, but the deformed 3D blade shape is necessary. The authors focus on a feature that the deformed blade shape can be represented by the position change of the wing section and developed an estimation method for the deformed blade shape by image-registration. For verification of the system’s effectiveness, model experiments were conducted in the NMRI’s large cavitation tunnel using the highly skewed propeller of a training ship “Seiun-Maru-I”. Comparing the results of experiments and numerical...
Recently, applying a composite material to ship propellers is considered. A phenomenon of the com... more Recently, applying a composite material to ship propellers is considered. A phenomenon of the composite material propeller is to deform elastically while a propeller rotating. Using this phenomenon, the design of a new concept propeller which is a high efficiency and reduces a cavitation by adapting to ship wake is studied. This present paper will describe the composite propeller performances (propeller characteristics and cavitation performance) under the elastic deformation. The several model propellers with the different Young’s modulas are made. In order to confirm the propeller characteristics and the cavitation performance of these propellers, the model tests are carried out in a cavitation tunnel of Akishima Laboratories (MITSUI ZOSEN) Inc. The thrust and torque of these propellers deforming elastically are measured, and are compared with the propeller characteristics of a propeller made by aluminum not to deform. And in order to evaluate the cavitation, the fluctuating press...
In this paper, the result of investigation of a high efficient propeller shape in complicated wak... more In this paper, the result of investigation of a high efficient propeller shape in complicated wake distribution generated by a stern duct which is one of energy saving devices is presented. So far, authors have introduced a propeller optimum design system [1] combining Computational Fluid Dynamics analysis, design of experiments, response surface method and genetic algorithm. However, it was limited to performing shape optimization in a uniform flow, and operating point of the propeller, that is, relationship between propeller rotation and engine output is not taken into account. Therefore, in this paper, authors firstly improve the system so that these relationships which are essential for the actual propeller design are taken into account. Secondly authors enabled shape optimization both in uniform flow and in a wake distribution at the same time. The pitch distribution and the maximum camber distribution in the radial direction of the propeller are adopted as the design variables...
Reduction of greenhouse gas (CO2 etc) emission is an important issue to address global warming. I... more Reduction of greenhouse gas (CO2 etc) emission is an important issue to address global warming. In recent ship design, it is essential to improve propulsive performance and fuel oil consumption, and the demand for high-efficiency propeller is growing rapidly. The authors have been investigating the possibility of the application of CFD to the propeller performance evaluation and optimization. In these previous papers[1,2], the authors presented CFD simulation of non-cavitating and cavitating flow around a marine propeller using a commercial CFD code. A good agreement with the experiment was confirmed for the non-cavitating flow. Various validations were also carried out for the cavitating flow, and the followings were described. First, we confirmed that the cavity shape in a uniform flow was qualitatively well estimated, but the difference between two propellers, of which the blade sections were somewhat different, were not reproduced. Secondary, the cavity shape in the non-uniform ...
... The newly designed ducted propeller is equipped for Z-peller of Niigata Power Systems Co., ... more ... The newly designed ducted propeller is equipped for Z-peller of Niigata Power Systems Co., Ltd as a propulsor of a tugboat, and the full-scale bollard pull test is conducted in the actual field. ... 0 Figure 12 Model Test Results of Bollard Pull Efficiency ...
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