Research on the influence of the number of holes in porous ventilated plate on the jet length

Abstract The influence of porous ventilation plate on the smoothing effect of filtered gas is mainly reflected in the jet length after the airflow passes through the porous ventilation plate. The shorter the jet length is, the less the influence of the uniform flow on the subsequent equipment is. In order to solve the problem that different number of openings of porous ventilation plate has different length of jet flow in the downstream, a small size unit module of porous ventilation plate is selected for research, and its geometric shape is reproduced truly. Under the premise of keeping the aperture constant, the opening rate of the porous ventilation plate is indirectly changed by changing the number of openings on the porous ventilation plate, and the influence law of different number of openings on the downstream jet flow is analyzed and studied. In this paper, the incompressible N-S equation and the RNG k-e turbulence model are used to simulate the jet flow field distribution of the porous ventilation plate module. Through simulation calculation, the influence law of different number of openings on the jet length and velocity under the same aperture is obtained. Further, by comparing and analyzing the velocity variation curve in the center area of the porous ventilation plate, the basic research ideas and theoretical basis are provided for the design, selection and research of the opening of the porous ventilation plate, which has a certain reference value to guide the engineering design and application of the porous ventilation plate.