| 摘要: |
| 风道结构的改变可有效改善自提冷冻柜内部气流组织和优化热环境性能。本文在自提冷冻冷藏柜有负载状态下，针对上送上回送风方式，改变风道结构，即轴流挡板角度(30°、45°、60°、90°)、背部送风孔板开孔方式（上疏下密的非均匀式开孔、下部集中式开孔、等间距式开孔）以及送风板通孔率(6%、8%、10%)，建立10种模型并分析对比，选取最优结构模型。并将原始结构（挡板角度45°、集中开孔方式、开孔率6%）模拟与实测结果进行对比，验证了模型的正确性。数值模拟和实验验证结果显示，回风板角度60°时相比于原对照组45°的均匀性提高了23.0%，非均匀开孔方式相比于集中式开孔速度均匀性提高了4.8%，且通孔率为8%时比原6%提高了5.1%整体均匀性，因此在回风板角度α=60°，送风板非均匀式开孔、通孔率φ=8%时冷冻柜气流组织合理，热环境性能较为理想。 |
| 关键词: 自提冷冻冷藏柜 风道结构 风机挡板角度 送风孔板 评价指标 |
| DOI： |
| 投稿时间：2018-05-25 修订日期：2019-02-07
|
| 基金项目:江苏省政策引导类计划（BR2018051）、泰州市科技支撑计划（农业）项目(TN201805)和江苏省优秀研究生工作站（佳力图）创新工程项目资助。 |
|
| Influence of Air Duct Structure on the Flow Field and Temperature Field of Self-pickup Freezers |
| Chen Zhiming,Zhang Zhongbin,Xu Guanyi,Huang Hu,Wang Qing |
| (Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province, School of Energy and Mechanical Engineering, Nanjing Normal University;Jiangsu Beiyang Cold Chain Equipment Technology Co. Ltd.) |
| Abstract: |
| Modifying the air duct structure can effectively improve the air flow inside self-pickup freezers and optimize their thermal environment performance. Under the M-test package condition, air duct structures were modified separately with respect to axial baffle angle (30°, 45°, 60°, and 90°), perforation rate (6%, 8%, and 10%), and opening mode of the back orifice plate (non-uniform openings with upper sparse and lower dense, lower centralized openings, and equally spaced openings). Ten types of models were established and compared to determine the optimal structure model. Simulation results of the original structure (axial baffle angle of 45°, centralized openings, and perforation rate of 6%) were compared with the measured results to verify the correctness of the model. Both the numerical simulation and experimental verification show that the uniformity at α= 60° is 23% higher than that at 45°, velocity uniformity of non-uniform opening is 4.8% higher than that of the uniform openings, and overall uniformity is 5.1% higher than that of the original 6% when φ=8%. Therefore, airflow in the freezer is well organized and thermal environment performance is the best when the baffle angle of the axial fan was α=60°, non-uniform opening of the back orifice plate was considered, and perforation rate φ=8%. |
| Key words: self-pickup freezers air duct structure angle of fan baffle air supply orifice plate evaluation index |
