The Research On Modeling And Simulation Of Ship Ventilation Pipe Network System

The purpose of the engine room ventilation system is to provide sufficient fresh air for the cabin,to ensure that all equipment in the cabin can work properly,and the cabin equipment running away heat dissipation for the cabin crew to create a relatively comfortable working environment.Based on the analysis of the one-dimensional flow characteristics of compressible fluid and the theory of pipeline gas flow loss,the mathematical model of the pipeline ventilation system is established and simulated.Firstly,based on the hydraulic analysis of the gas in the ventilation pipe network to establish he flow and method of the physical parameters in the gas flow under different flow conditions.Secondly,the knowledge of graph theory is introduced to establish the physical model for ventilation system pipe network.The mathematic model of the pressure and flow in the pipe network is established,and the mathematical model of the ventilation system is established.The main accessories and equipment operating parameters are analyzed to establish the mathematical models.Thirdly,the algorithm of hydraulic calculation for the ventilation system of the cabin in the tree-shaped pipe network structure and the annular pipe network structure is studied.The algorithm of the solution flow method,the nodes pressure method and the Hardy-Cross method are analyzed.And the algorithms are verified by the MATLAB software.In the ventilation system in the rationality and correctness.At last,the ventilation system of "Yupeng"engine room was taken as the object of study,and the simulation software of ventilation system was compiled in C#language under the.NET platform to simulate and simulate the ventilation system under different working conditions,such as opening and closing of fans and ventilation gates.