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An Experimental Study on the Effect of the Side Hull Symmetry on the resistance performance of a Wave‑Piercing Trimaran

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Journal of Marine Science and Application 2021年第3期20卷 456-466页

作者： Abolfath Askarian Khoob Atabak Feizi Alireza Mohamadi Karim Akbari Vakilabadi Abbas Fazeliniai Shahryar Moghaddampour Marine Faculty of Imam Khomeini Maritime UniversityNowshahrIran Department of Civil Engineering Faculty of EngineeringUniversity of Mohaghegh ArdabiliArdabilIran

This paper presented the results of an experimental investigation into the resistance performance of a wave-piercing trimaran with three alternative side hull forms,including asymmetric inboard,asymmetric outboard,and symmetric at various stagger/separation *** tests were carried out at the National Iranian Marine Laboratory(NIMALA)towing tank using a scale model of a trimaran at the Froude numbers from 0.225 to *** showed that by moving the side hulls to the forward of the main hull transom,the total resistance coefficient of trimaran ***,furthermore,demonstrated that the symmetry shape of the side hull had the best performance on total resistance among three side hull *** of this study are useful for selecting the side hull configuration from the resistance viewpoint.

关键词： resistance performance Wave-piercing trimaran Seakeeping characteristics Side hull symmetry Model test Experimental study

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Experimental Study on the resistance and Splash performances of Water Collecting Devices for Mechanical Draft Cooling Towers

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Fluid Dynamics & Materials Processing 2023年第7期19卷 1789-1801页

作者： Guoqing Long Guogang Zhang Qi Zhang Cuilin Zhao Suoying He Fengzhong Sun China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd.Guangzhou510663China School of Energy and Power Engineering Shandong UniversityJinan250061China

In recent years,water collecting systems,with the associated advantages of energy saving and noise reduction,have become the foundation for the development of a scheme to optimize the structure of cooling *** explore the feasibility of this approach for mechanical draft cooling towers,a small-scale experimental device has been built to study the resistance and splash performances of three U-type water collecting devices(WCDs)for different water flow rates and wind *** experimental results show that within the considered ranges of wind speed and water flow rate,the pressure drop of the different WCDs can vary *** resistance and local splash performances can also be remarkably *** recommendations about the most suitable system are ***,a regression analysis of the experimental data is conducted,and the resulting fitting formulas for resistance and splash performance of WCD are reported.

关键词： Mechanical draft cooling towers water collecting device resistance performance splash performance fitting formulas

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Hydrodynamic performance of Open-frame Deep Sea Remotely Operated Vehicles Based on Computational Fluid Dynamics Method

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Journal of Marine Science 2022年第1期4卷 23-33页

作者： Qianrong Li Baoji Zhang Merchant Marine College Shanghai Maritime UniversityShanghai201306China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai201306China

The resistance performance and motion stability of deep sea remotely operated vehicles(ROVs)subjected to underwater motion conditions are studied on the basis of the unsteady Reynolds-averaged Navier-Stokes method combined with the six-degree-of-freedom equation of motion to quickly and accurately predict *** the modeling process,we consider the complexity of ROV geometry and thus reduce the model to a series of regular geometries to maximize the position and weight of the original *** grid and value slots of an ROV are divided,and the surface is *** forward,backward,transverse,floating,and submerged resistance of ROVs are simulated and compared with existing experimental forces to determine the accuracy of the calculation ***,the oblique navigation of the ROV on the horizontal and vertical planes is ***,the motion response of the ROV to direct horizontal motion,heave,pitch,and yaw are *** force,moment,and motion time curves are *** stability of ROV motion is analyzed to provide technical support for the safety of ROVs.

关键词： ROV CFD resistance performance Motion stability Numerical simulation

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