| The combination of fan and heat exchanger is commonly used in the heat exchange structure of electromechanical products and is integrated in rectangular flow channels.Axial fans are often installed in rectangular flow passages as airflow drive components to reduce product energy consumption.However,the double resistance of the shroud and the heat exchanger will have a great influence on the operating conditions of the axial fan,resulting in different effects of the flow field characteristics of the fan and the heat field characteristics of the heat exchanger.In order to reasonably match the characteristics of the axial fan flow field and the evaporator thermal field to ensure efficient and energy-saving heat transfer in the rectangular flow path,the rectangular flow passage with the evaporator and the axial flow fan used in the intercooled refrigerator was selected as the research object.The flow characteristics and heat transfer characteristics of the fan in a rectangular flow channel under changing flow hood conditions were studied.Firstly,the aerodynamic performance of the axial fan was experimentally studied.Secondly,the fluent software was used for numerical simulation to quantitatively and qualitatively describe the distribution of the internal and external flow field parameters of the fan.Comparison with the experiment can prove the correctness of the simulation model.A mapping model between the design parameters of the fan and its aerodynamic performance was established.By comparison with the simulation experiment,the feasibility of the mapping relationship model was confirmed,and the design of the fan and the optimization of the air passage of the refrigerator were further guided.The air flow and heat transfer experimental station was set up,and the effects of different fan flow field conditions on the overall heat transfer performance of the evaporator were experimentally studied,and the useful energy distribution of the heat transfer was determined.Based on the experimental research,the evaporation chamber system structure was numerically simulated to determine the overall heat transfer performance of the evaporator internal air under the different positions of the fan and its shroud and evaporator,and corresponding comparisons were made between the experiment and the simulation.Verify the accuracy of the simulation model.The mapping relationship model among the design parameters,the fan operation performance and the evaporator internal air heat transfer performance was established.By comparing with simulation experiments,the correctness of the mapping relationship model can be confirmed.Finally,the air flow inside the shroud is simplified to onedimensional and two-dimensional flows for analysis.At the same time,compared with the experiment,the feasibility of theoretical analysis can be proved. |
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