长度1~10 m金属滤芯脉冲喷吹性能的模拟*

为探究金属长滤芯的脉冲喷吹性能，运用ANSYS Fluent软件开展脉喷流场的数值模拟，考察滤芯长度和金属网目数对喷吹强度和均匀性的影响。研究结果表明:脉冲喷吹过程中金属滤芯内存在4类压力峰，分别为静压波峰、气团膨胀峰、蓄积反弹峰、余压波动峰；不同长度滤芯内的静压力分布不同，金属短滤芯（1 m）的底部喷吹气流蓄积最为剧烈，形成的压力最大，中等长度滤芯（2~4 m）底部压力蓄积减弱，低于上部区域，长滤芯（5~10 m）内喷吹气流沿途先膨胀后持续减弱，侧壁压力整体表现为上部＞中部＞底部；1~5 m金属滤芯的喷吹强度及均匀性随着滤芯长度增加而变差，6~10 m金属滤芯的喷吹强度及均匀性随着滤芯长度增加而得到改善，且都随金属网目数的增加而改进。研究结果对金属滤芯的设计与优化具有指导意义。

Simulation on pulse injection performance of metal filter element with length of 1~10 m

In order to explore the pulse injection performance of metal long filter element,the numerical simulation of pulse injection flow field was carried out by using ANSYS Fluent software,and the influence of filter element length and metal mesh number on the injection intensity and uniformity was investigated.The results showed that there were four types of pressure peaks in the metal filter element during the pulse injection process,including the static pressure peak,air mass expansion peak,accumulation rebound peak and residual pressure fluctuation peak.The static pressure distribution in the filter elements with different lengths was different.The bottom injection flow accumulation of the metal short filter element (1 m) was the most intense,and the pressure was the largest.The bottom pressure accumulation of the medium length filter element (2~4 m) was weakened,which was lower than the upper region.The injection flow in the long filter element (5~10 m) expanded first and continued to weaken along the way.The overall side wall pressure was upper > middle > bottom.The injection intensity and uniformity of 1~5 m metal filter element became worse with the increase of filter element length,while the injection intensity and uniformity of 6~10 m metal filter element were improved with the increase of filter element length,and both of them were improved with the increase of metal mesh number.The research results have guiding significance for the design and optimization of metal filter elements.