论文部分内容阅读
对两个横向直吹布风的冷库冻结间进行了流场和温度场测定，采用D．B．Spalding的k-ε双方程模型和SIMPLE算法对流场进行了计算机数值模拟。结果表明，由于结构尺寸和风机布置决定了流场呈现一个中心大回流，局部存在次中心大回流和小回流气团，从而显示了该两冻结问原设计存在的缺陷。针为实测和数值模拟结果对其布风结构进行了改进，取得了预期效果：当冻品中心平均温度达到一10℃时．冻结时间缩短15～16％．相应干耗降低约18％．冻品质量有了明显提高。
On the two horizontal straight air blowing cold freezer between the flow field and temperature field determination, the use of D. B. Spalding k-ε two-equation model and SIMPLE algorithm were used to simulate the flow field. The results show that due to the size of the structure and the layout of the fan, the flow field shows a central large backflow and the local sub-center large backflow and small recirculation air mass show the defects of the original designs. Needle for the actual measurement and numerical simulation results of its cloth structure has been improved, and achieved the desired results: when the average temperature of the frozen center reaches a 10 ℃. Shorten the freezing time 15 ~ 16%. The corresponding dry loss is reduced by about 18%. Frozen product quality has been significantly improved.