Research On Air Distribution And Optimization Of Structural Air Duct

Currently, the design of the ventilation pipe system of shipbuilding industry, its main characteristic is through the simulation airflow organization to carry on the design and optimization, to achieve the lean of the ventilation system design. At present, for ship and marine engineering aspects of ventilation piping systems analysis, designers are based on experience and lack of data to verify the design of the wind pipe. They are only through the smoke test or measurement when it completed the wind pipe. Moreover, it is very troublesome to modify the future when the wind pipe is completed. It needs to destroy the structure and paint. It’s very great if they can use the idea that modeling and simulation the system in the beginning of ship design. Simulate airflow organization can be taken in the form of the entire pipeline system by measuring the velocity field and pressure field in the pipe inlet and outlet,which can provide the theoretical basis and reference for the pipe ventilation system. The most important is that they can optimize the airflow in the piping system and realize the minimum resistance of ventilation pipe in meeting the requirements. So they can get a system that is minimum energy loss, noise damping, improve the economy.In this article it mainly selected marine platform Wind nacelle and transformer between the pipes as a carrier, using HyperMesh and Fluent simulation software as a tool for ventilation duct system flow field analysis. It draw the pipe resistance curve, wind pipe velocity vector the structure of the wind pipe to optimized and compare the pre-optimized piping and ventilation systems in order to improve the ventilation efficiency. In this paper numerical simulation provided a basis for the design of ventilation system and taking the ventilation ducts between the engine room and the transformer as the research object, research contents including:The first chapter introduces the research background and significance of this research project, the status quo about analysis of marine and offshore engineering structures by CFD technology at home and abroad, and summarized the research content and organization structure of this paper.The second chapter introduces some of the basic theory of numerical simulation used in this paper, flow and heat transfer control equation, computational domain discretization, algorithm analysis of numerical calculation of flow field and overview of turbulent flow.The third chapter of the duct flow field structure analysis, introducing the mesh HyperMesh software and the establishment of calculation model.The fourth chapter is to verify the feasibility of CFD technology, and to compare the simulation of the pipeline resistance value with theoretical calculation of pipeline resistance values by taking a section of the structure of the wind pipe model.In the fifth chapter, the numerical simulation and optimization of the wind pipe is carried out. The CFD file is imported into the Fluent software, analyzed and verified it and proposed an optimization scheme.The last chapter summarizes the results and the future of the research project.