Numerical simulation study of a new pulse blowing tube

In this paper， a novel pulse cleaning blowpipe was independently designed. Based on fluid mechanics principles， the blowpipe was configured with an inner diameter of 40 mm and a total length of 660 mm. 6 mm diameter orifices were drilled at 110-mm intervals along the circumferential direction of the pipe； these orifices serve as gas outlets， directing the blown gas to act directly on the inner wall of the filter cartridge. The cleaning process was achieved through the combined action of gas flow impact force and cleaning pressure. Experimental design was based on computational fluid dynamics （CFD） simulations， with tests conducted under a pulse pressure of 0.3 MPa. Pressure contour diagrams of cross-sections at different time intervals and those at varying blowing distances at the same time point were monitored. On this basis， the total pressure peaks， dynamic pressure peaks， and static pressure peaks were measured separately at the front orifices， inter-front-orifice regions， side orifices， and inter-side-orifice regions of the blowpipe. Pressure variations of dynamic and static pressures throughout the entire cleaning process were analyzed using the pressure contour diagrams. The results indicate that the system reaches a stable state at 60 ms， significantly shortening the cleaning cycle. It was concluded that the front orifices exhibit the highest pressure peaks， while the inter-side-orifice regions show the lowest pressure peaks. However， the gas blowing uniformity at the inter-side-orifice regions is significantly superior to that at the front orifices.