The purpose of this study is to develop a design method for composite propellers for the ships. R... more The purpose of this study is to develop a design method for composite propellers for the ships. Recently, the composite materials propeller has attracted attention from the viewpoint of improvement of propulsive performance and cavitation performance. The method to predict the elastic deformation and propeller characteristic of composite propeller with sufficient accuracy becomes an important technology. The authors have been investigating the method to predict propeller blade deformation and propeller characteristic of composite propeller by using Fluid-Structure Interaction (FSI) analysis. In this paper, we measured three-dimensional shape of deformation composite model propeller by Combination line CCD camera measurement method developed by NMRI (National Maritime Research Institute). Then, by performing comparison with the results of these experiments, we enhanced the FSI analysis technique to predict the performance of the marine propeller in nonuniform flow. Moreover, we carri...
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...
The propeller boss cap fins (PBCF) is well known to be one of the most successful energy-saving d... more The propeller boss cap fins (PBCF) is well known to be one of the most successful energy-saving devices for ships. More than 3,300 sets have been sold since its first introduction in 1987. In this paper, SPIV measurements and CFD calculations were carried out in order to investigate the reasons for the difference in the energy saving effects of PBCF in model test and in full scale data. It was confirmed to be able to evaluate the full scale energy saving effect of PBCF by reversed POT with wire-mesh screen method by taking account simulated ship wake. As these results, it was suggested that the reversed POT with wire-mesh is effective prediction method to estimate the energy saving effect of PBCF in full scale. And we were carried out the experiments on the combined effect of PBCF and other energy saving devices (ESD). It was confirmed that the effectiveness of the combination of PBCF and other ESD for EEDI improvement.
A ducted propeller is well known to offer significant advantages for bollard pull performance of ... more A ducted propeller is well known to offer significant advantages for bollard pull performance of tugboats. A study about nozzle and propeller shape has been done for a long time, and a Ka series propeller and a conventional 19A nozzle is used ordinarily for a ducted propeller. In late years a demand of the energy saving becomes very high because of a remarkable rises of the fuel oil price, and high bollard pull performance are demanded for tugboats at the same horsepower. Therefore, an improved design of a ducted propeller with high bollard pull performance is required. This present paper will describe the advanced design method of a ducted propeller which has high bollard pull performance. A nozzle section shape and a propeller are newly designed by a parametric study of the numerical simulation to have higher performance than a conventional ducted propeller. And the optimum arrangement between nozzle and propeller combination is studied. In order to confirm high bollard pull perfo...
A ducted propeller is well known to offer significant advantages for bollard pull performance of ... more A ducted propeller is well known to offer significant advantages for bollard pull performance of tugboats. A study about nozzle and propeller shape has been done for a long time, and a Ka series propeller and a conventional 19A nozzle is used ordinarily for a ducted propeller. In late years a demand of the energy saving becomes very high because of a remarkable rises of the fuel oil price, and high bollard pull performance are demanded for tugboats at the same horsepower. Therefore, an improved design of a ducted propeller with high bollard pull performance is required. This present paper will describe the advanced design method of a ducted propeller which has high bollard pull performance. A nozzle section shape and a propeller are newly designed by a parametric study of the numerical simulation to have higher performance than a conventional ducted propeller. And the optimum arrangement between nozzle and propeller combination is studied. In order to confirm high bollard pull perfo...
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 purpose of this study is to develop a design method for composite propellers for the ships. R... more The purpose of this study is to develop a design method for composite propellers for the ships. Recently, the composite materials propeller has attracted attention from the viewpoint of improvement of propulsive performance and cavitation performance. The method to predict the elastic deformation and propeller characteristic of composite propeller with sufficient accuracy becomes an important technology. The authors have been investigating the method to predict propeller blade deformation and propeller characteristic of composite propeller by using Fluid-Structure Interaction (FSI) analysis. In this paper, we measured three-dimensional shape of deformation composite model propeller by Combination line CCD camera measurement method developed by NMRI (National Maritime Research Institute). Then, by performing comparison with the results of these experiments, we enhanced the FSI analysis technique to predict the performance of the marine propeller in nonuniform flow. Moreover, we carri...
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...
The propeller boss cap fins (PBCF) is well known to be one of the most successful energy-saving d... more The propeller boss cap fins (PBCF) is well known to be one of the most successful energy-saving devices for ships. More than 3,300 sets have been sold since its first introduction in 1987. In this paper, SPIV measurements and CFD calculations were carried out in order to investigate the reasons for the difference in the energy saving effects of PBCF in model test and in full scale data. It was confirmed to be able to evaluate the full scale energy saving effect of PBCF by reversed POT with wire-mesh screen method by taking account simulated ship wake. As these results, it was suggested that the reversed POT with wire-mesh is effective prediction method to estimate the energy saving effect of PBCF in full scale. And we were carried out the experiments on the combined effect of PBCF and other energy saving devices (ESD). It was confirmed that the effectiveness of the combination of PBCF and other ESD for EEDI improvement.
A ducted propeller is well known to offer significant advantages for bollard pull performance of ... more A ducted propeller is well known to offer significant advantages for bollard pull performance of tugboats. A study about nozzle and propeller shape has been done for a long time, and a Ka series propeller and a conventional 19A nozzle is used ordinarily for a ducted propeller. In late years a demand of the energy saving becomes very high because of a remarkable rises of the fuel oil price, and high bollard pull performance are demanded for tugboats at the same horsepower. Therefore, an improved design of a ducted propeller with high bollard pull performance is required. This present paper will describe the advanced design method of a ducted propeller which has high bollard pull performance. A nozzle section shape and a propeller are newly designed by a parametric study of the numerical simulation to have higher performance than a conventional ducted propeller. And the optimum arrangement between nozzle and propeller combination is studied. In order to confirm high bollard pull perfo...
A ducted propeller is well known to offer significant advantages for bollard pull performance of ... more A ducted propeller is well known to offer significant advantages for bollard pull performance of tugboats. A study about nozzle and propeller shape has been done for a long time, and a Ka series propeller and a conventional 19A nozzle is used ordinarily for a ducted propeller. In late years a demand of the energy saving becomes very high because of a remarkable rises of the fuel oil price, and high bollard pull performance are demanded for tugboats at the same horsepower. Therefore, an improved design of a ducted propeller with high bollard pull performance is required. This present paper will describe the advanced design method of a ducted propeller which has high bollard pull performance. A nozzle section shape and a propeller are newly designed by a parametric study of the numerical simulation to have higher performance than a conventional ducted propeller. And the optimum arrangement between nozzle and propeller combination is studied. In order to confirm high bollard pull perfo...
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 ...
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