摘要：为评估喷吹气流偏斜现象对滤筒清灰性能的影响, 分别以喷孔式喷口和喷嘴式喷口为研究对象, 应用脉冲喷吹实验平台并结合纹影法研究喷吹气流偏斜影响;采用纹影法获取喷口高速气流流场影响区域, 对比不同型式和不同孔径的喷口对气流偏斜的影响;采用侧壁压力峰值作为评价指标, 测试不同喷口型式的偏斜现象对侧壁压力峰值的影响。结果表明:喷口气流偏斜现象与喷吹压力、喷口孔径成正相关关系, 喷吹压力由0.3 MPa升高至0.5 MPa, 气流核心区的最大速度由249 m/s增大至381 m/s, 水平方向分速度由66 m/s增大至79 m/s, 气流偏斜影响区域增大;喷嘴式喷口可以避免脉冲喷吹气流发生偏斜现象, 并会增大滤筒侧壁中上部区域的压力峰值, 同时改善滤筒侧壁压力峰值分布的均匀性。

关键词：喷吹气流；气流偏斜；脉冲清灰

Abstract：In order to investigate the influence of jet airflow deflection on the cleaning performance of filter cartridge, with the injection hole and the injection nozzle of the blowing tube as the research objects, the pulse-jet experimental platform and the schlieren method were used. The impact zone of high speed airflow was recorded by the schlieren device. The effects of the injection hole of different types and injection hole at different diameters on the airflow deflection were compared. Meanwhile, the peak pulse pressure on the side wall of the cartridge was used as the evaluation index to test the influence of airflow deflection on it. The results show that the jet flow deflection is positively related to the jet pressure and the hole diameter. When the jet pressure is increased from 0.3 to 0.5 MPa, the maximum velocity in the air core area increases from 249 to 381 m/s, and the horizontal velocity increases from 66 to 79 m/s, thus the area affected by airflow deflection increases. The injection nozzle can avoid the deflection phenomenon of the pulsed blowing air flow, and it can increase the pressure peak in the upper middle area of the cartridge side wall, and at the same time, it improves the uniformity of the peak pulse pressure distribution on the side wall of the cartridge.

Keywords：jet airflow；airflow deflection；pulse-jet cleaning