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NUMERICAL SIMULATION OF AIRFLOW DISTRIBUTION AND STRUCTURAL OPTIMIZATION IN AN ELECTROSTATIC OIL MIST PURIFIER
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摘要: 气流分布均匀性对结构紧凑的静电油雾净化器的净化效率影响较大。以通用的3500 m3/h静电油雾净化器为研究对象,采用数值模拟技术对内部流场进行仿真计算,发现净化器内部存在偏流现象,识别出导致偏流的结构影响因素,提出一种结构优化方案以改善气流分布均匀性,进而提升净化器的净化效率。模拟结果和实验测试表明:结构优化有效改善了净化器内部流场的均匀性,气流速度相对均方根值从0.44降低至0.14;在实际运行中,净化效率从原结构的87.8%提高至92.4%,压力损失仅增加30 Pa。证明通过改善气流分布均匀性来提高净化器的净化效率是可行的,这为其他型号的静电油雾净化器的设计改进与结构优化提供了参考。Abstract: The uniform airflow distribution greatly influences the purification efficiency of compact electrostatic oil mist purifiers. In order to obtain the local airflow characteristics, the internal flow field of the electrostatic oil mist purifier with an air volume of 3500 m3/h was simulated numerically by CFD, the bias current phenomenon inside the purifier was discovered, and the main influencing factors causing these nonuniform airflow were identified in the original structure. To solve this problem, structure optimization schemes were proposed to improve the airflow distribution uniformity, thereby improving the purification efficiency of the purifier. The simulation and experimental results indicated that compared with the original structure, the airflow distribution uniformity was significantly improved by the structure optimization, and the relative RSME of airflow velocity decreased from 0.44 to 0.14. Then, the experimental results showed that the purifier efficiency with the optimized structure increased from 87.8% to 92.4%, while the total pressure drop only increased by 30 Pa. It was proved feasible to increase the purifier efficiency by improving the airflow distribution uniformity, which had certain reference significance for the design improvement and optimization of the compact electrostatic oil mist purifiers.
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