Three Dimensional Numerical Simulation For Fluid Flow In Internal Field And Its Parts Of Scoop Cooler

The study of the paper is a part of the research about flow characteristic of scoop cooler. The computational fluid dynamics (CFD) method is described for simulating fluid flow in the internal fields and its parts.The modularization of physical models and grids of the internal fields is provided a flexible method to achieve the whole computational grid. The resistance characteristic and flow characteristic of the internal system under kinds of different boundary conditions are analyzed from the results.The flow fields of the main parts, such as the condenser, the valve and the bar are simulated by CFD. The resistant loss of the results is identical with the experimental values. It validates the feasibility of the model and method, while it indirectly demonstrats the correct of the whole calculation results.Porous media model is employed to simulate numerically fluid flow in tube-side of a condenser. Good agreement is obtained in resistant coefficient of the tube-side between computed results and the experiments, demonstrating the feasibility of the model and the method. It resolved the problem of CFD modeling and the large number of meshes for the tube-side of condenser。It can be seen clearly the main factors effecting the operation of the condenser from the calculated 3-D flow field. The method can be used to simulate the tube-shell heat exchanger. The flow behavior in the condenser can provide a theoretical basis for optimal design and safety analysis.The method of separating zones and using the symmetry boundary conditions largely reduce the meshes of the tube side of the above condenser in the simulation by CFD. It can obtain the similar flow characteristic results of the above method. It also can obtain the non-uniform material flow distribution and flow velocity distribution in the cooling tubes. It also can receive the non-uniform material flow distribution which is relative with the difference of arrangement of the tubes.Based on these studies, a flow-leading device is designed to improve the flow characteristic, which can be fixed to the inlet chamber of the condenser. It can be seen from the results of the simulation by CFD that the flow-leading device can reduce the resistant loss and the non-uniform velocity distribution.