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Experimental and numerical investigations into flow features in an intake duct for the waterjet propulsion under mooring conditions

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Acta Mechanica Sinica 2021年第5期37卷 826-843,I0003页

作者： Renfang Huang Ruizhi Zhang Yiwei Wang Xianwu Luo Lei Zhu Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China Science and Technology on Water Jet propulsion Laboratory Shanghai 200011China College of Engineering Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Hydroscience and Engineering Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China China Institute of Water Resources and Hydropower Research Beijing 100038China

The waterjet propulsion is widely applied in the marine vessels over 30 knots,and the intake duct is considered as an essential component that strongly relates to the propulsion *** paper sheds light on the flow features inside an intake duct under mooring conditions by using the particle image velocimetry(PIV)technique with three-dimensional(3D)numerical *** hydraulic loss gradually increase as the flow-rate *** to analyses via the Bernoulli equation,the hydraulic loss is composed of the frictional head loss(h_(f)~V^(1.75))and the local head loss(h_(j)~V^(2.0)).A recirculation region is observed near the duct lower wall with a high-velocity flow near the upper wall,and subsequently a shear flow presents in the horizontal straight pipe with an obvious velocity ***-dimensional simulations demonstrate that the vortex pair is very strong in the recirculation region and then it gradually decreases as the fluid flows *** the flow-rate increasing,the non-uniformity at the duct outlet firstly increases to a peak and then slightly decreases,while the perpendicularity at the duct outlet dramatically decreases to a minimum and then *** work not only reveals some physics of the waterjet propulsion under mooring conditions,but also promotes its efficient operation.

关键词： waterjet propulsion Particle image velocimetry(PIV) Intake duct waterjet pump Mooring conditions

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Nozzle Optimization for Water Jet propulsion with A Positive Displacement Pump

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China Ocean Engineering 2014年第3期28卷 409-419页

作者：杨友胜谢迎春聂松林 College of Engineering Ocean University of China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology

In the water jet propulsion system with a positive displacement （PD） pump, the nozzle, which converts pressure energy into kinetic energy, is one of the key parts exerting great influence on the reactive thrust and the efficiency of the system due to its high working pressure and easily occurring cavitation characteristics. Based on the previous studies of the energy loss and the pressure distribution of different nozzles, a model of water jet reactive thrust, which fully takes the energy loss and the nozzle parameters into consideration, is developed to optimize the nozzle design. Experiments and simulations are carried out to investigate the reactive thrust and the conversion efficiency of cylindrical nozzles, conical nozzles and optimized nozzles. The results show that the optimized nozzles have the largest reactive thrust and the highest energy conversion efficiency under the same inlet conditions. The related methods and conclusions are extended to the study of other applications of the water jet, such as water jet cutting, water mist fire suppression, water injection molding.

关键词： energy loss nozzle PD pump reactive thrust waterjet propulsion

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Research on Flow Loss of Inlet Duct of Marine waterjets

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Journal of Shanghai Jiaotong university(Science) 2010年第2期15卷 158-162页

作者：丁江明王永生 College of Naval Architecture and Power Engineering Naval University of Engineering

In the process of performance prediction of waterjet system,the flow loss of inlet duct is usually reckoned by the rule of thumb. But its value is often overestimated to some extent,resulting in error of prediction accuracy. This paper introduces a new method to determine the flow loss by means of computational fluid dynamic (CFD). Firstly,the fluid field around waterjet system is simulated by solving the Reynolds Averaged Navier-Stokes (RANS) equations using commercial CFD code Fluent. Then an additional User-Defined Scalar (UDS) equation is embedded into Fluent to get the virtual dividing surface between the internal flow ingested into the inlet duct and the external flow beneath the hull,which is named as streamtube. By virtual of the streamtube the flow loss can be calculated according to the difference of total pressure between the duct outlet and the capture area ahead of the intake. The results from CFD calculation show that the flow loss coeflcient of a typical flush-type inlet duct is varying from 0.05 to 0.12 at different operation conditions,being obviously less than the value of 0.2-0.3 from empirical rules. With the results of this paper the prediction accuracy on propulsive performance of the waterjet system can be improved further.

关键词： ships waterjet propulsion inlet duct flow loss computational fluid dynamics

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