The Numerical And Experimental Study Of Vapor-Liquid Two Phase Flow And Heat Transfer In Marine Condenser

As one of an important part of the ship steam power plant,there are a number of turbine exhaust steams in the shell side of the condenser.During its operation,the two-phase flow and heat transfer has a serious impact on the economy and security of the device.So it is important on researching two-phase flow and heat transfer in condenser.Firstly,the physical model and working conditions is simplified.The shell side flow is simplified as single-phase steady flow of steam-air mixture.Porous medium model with distributed resistance and mass sinks is used to simulate the structure with a large of tube bundles.The model is based on the conservation equations of continuity,momentum and mass fraction for non-condensable gases.Then we give distributed resistance correlation about the equations and the boundary conditions.Finally we establish a numerical model of the condenser.Secondly,by using relevant parameters in condenser,we projected formula of distribution resistance and mass sinks and so on.Then these formulas was compiled as the user-defined functions(UDFs)and loaded into commercial software Fluent.Then the appropriate boundary conditions was selected.On this basis,the numerical flow and heat transfer of the shell side of condenser was achieved.And we get the distribution side of the condenser shell velocity,pressure and other important parameters,and analyze them simultaneously.Lastly,by building a steam power system test bench,important parameters of the condenser are measured and compared with the simulation results and verify the correctness of numerical method.With the results of the velocity,pressure and other important parameters in the shell side of condenser,some valuable conclusions is found.Thus it can provide reference for the optimization of the structure of the condenser.