摘要
将BCD-190W型间冷式冰箱冷冻室作为研究对象,采用模型实验的方法并应用粒子图像速度场仪系统对冰箱冷冻室内的流场进行了实验研究.以相似理论为指导建立了间冷式冰箱冷冻室物理模型,采用块结构化网格对计算区域进行了网格划分.选择风扇出口平面作为计算区域入口边界,应用RNGk-ε模型建立了冷冻室内空气流动的三维紊流数学模型,用SIMPLEC算法对模型进行了求解.数值模拟和实验结果吻合良好,证明所建立的模型是正确的.实验和模拟结果均表明:顶层间室送风射流有利于阻隔环境传入的热量;中间层左右对称的送风口中心流速的差别约为28%,将造成间室内温度分布严重不均匀;底层送风口存在明显的射流短路现象.
The freezer chamber of a BCD-190W type frost-free refrigerator was chosen as a research object, and digital particle image velocimetry （DPIV） technology was adopted to investigate the flow fields in the freezer chamber of a transparent refrigerator model. The physical model of the freezer chamber was constructed based on the similarity theory and the hexahedron grid was applied to discretize the computational domain. The intake fan outlet velocity distribution was regarded as the inlet boundary condition, and the 3-D turbulence RNG κ-ε mathematical model for the inner flow was established. The SIMPLEC algorithm was applied to deal with coupling between velocity and pressure. The numerical simulation results agree well with the DPIV measurement results, which indicates that the present mathematical model is correct. The numerical simulation and experiment results show that the flow field in the first chest was favorable for obstructing the heat transfer though the surrounding walls. The relative difference of center velocity between the two symmetrical supply air opening jets of the second chest approached 28%, leading to a serious non-uniform temperature distribution in the chest. The supply air opening jets had a short circuit in the third chest obviously.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第3期323-327,共5页
Journal of Xi'an Jiaotong University
