The Design And Research On Heat-dissipating Of Electronic Components In Narrow And Small Channel

This paper introduces the heat-dissipating design of a certain small detecting antenna. According to the distribution characteristic of electronic components that release thermal energy in antenna, the plan of cooling technology with fixed-point jet flow is the best choice. Firstly, the design theory of fixed-point jet flow pipelines and the branch pipelines with constant resistance coefficient has been introduced, the apertures of the fixed-point jet flow pipelines and the inside diameters of the branch pipelines have been obtained through calculation program. As follow, the experiment of the relationship between the static pressure of the main pipeline inlet and total air volume and the temperature experiment in the antenna have been done. For further research on the law of the uniform ventilation, the air supply of the branch pipelines has been studied through numerical simulation with Spalart-Allmaras turbulent model. compared the simulated results with the experimental results,both of them are nearly identical, Which shows the turbulent model can simulate the air supply of pipeline. Concerned of the changes of the resistance coefficient along the fixed-point jet flow pipeline, new fixed-point jet pipeline has been obtained. The air volumes from the orifices of the two kinds of fixed-point jet pipelines are calculated with Spalart-Allmaras turbulent model, the uniformity is not ideal under design conditions. The reason lies in discharge coefficient of the orifices is not a constant, but is a variable that gradually increases along the way. So the change of discharge coefficient should be considered. A new formula about the area of orifice can be gained through deduction. The simulated results show that the uniformity of the pipeline which has been revised obviously becomes better. At last, based on the research conclusion of this paper, the software of Uniform Supply Air Duct has been completed with MFC.