冷冻室温度均匀性需求下冷冻风道出风口的优化设计

The Optimal Design of the Air Outlet of the Freezing Duct under the Demand of the Temperature Uniformity of the Freezing Chamber

文章以某型号风冷冰箱的冷冻风道为研究对象,建立了冷冻风道初始模型,通过流场仿真获得初始结构下冷冻室内的温度分布,并以实验验证了初始模型的正确性;然后通过改变冷冻风道出风口的拔模角度来设计对照仿真试验并探究出风口风量和截面平均速度的变化,最后得到冷冻室内各个样本点的温度分布情况以及温差结果。结果表明,第1层、第2层的出风口拔模角度α=18 °时,第1、2、3层出风口面积分别为9、4.8、10.2 cm^2时,温差评价标准为Δt=1.94 ℃,冷冻室内的温度均匀性达到最优,相比初始模型优化了3 %。

In this paper,the air duct of a certain type of air-cooled refrigerator is taken as the research object,and the initial model of the air duct is established.The temperature distribution in the freezing chamber under the initial structure is obtained through the flow field simulation,and the correctness of the initial model is verified by the experiment.Then,the comparative simulation experiment is designed by changing the draft angle of the air outlet of the air duct,and the variable air volume and the average section speed of the air outlet are explored Finally,the temperature distribution and temperature difference results of each sample point in the freezer are obtained.The results show that when the draft angle of the first and second layers is 18°,the area of the first,second and third layers is 9,4.8 and 10.2 cm2 respectively,the temperature difference evaluation standard isΔt=1.94℃,and the temperature uniformity in the freezer is the best,which is 3%better than the initial model.