Research on Factors Influencing the Uniformity of Air Curtain and Its Dust Isolation Effect
In recent years,air curtains,as an effective device to isolate diffused dust,are frequently used in dust-prone environments,such as mining and tunneling construction.A more uniform air cur-tain provides better dust isolation.Fluent numerical simulation,combined with similar experimental methods,was used to analyze the effects of air curtain diameter and internal air duct structure on air curtain uniformity.A uniformly designed air curtain was installed in a tunnel construction model to sim-ulate and evaluate its dust isolation efficiency.The results showed that as the diameter increased,the axial inertial force of airflow within the supply system decreased,allowing sufficient time for the flow direction to change.Meanwhile,the axial static pressure of the air curtain device became more uni-form,forming a more homogeneous air curtain.However,the relationship between diameter and air curtain uniformity was nonlinear,with a critical diameter beyond which further increases had minimal effect on uniformity.Additionally,the effective range of diameters increased with the length of the air supply device.In a 1-meter air curtain system with a critical diameter of 180mm,the installation of a wedge-shaped fan-shaped blocking body with an arc height of 149.9mm,calculated according to air duct design principles,reduced the average pressure gradient inside the air curtain device from 38.4Pa/m to 19.3Pa/m,while the uniformity of the exit airflow increased from 87.6%to 93.2%,significantly enhancing air curtain uniformity.Finally,after installing the air curtain,the rebound of dust-bound air-flow in the isolated area was blocked,leading to more chaotic airflow with increased turbulence.This prolonged the dust retention time,allowing larger dust particles more time to settle.The dust concen-tration in the whole dust isolation area increased significantly,demonstrating the air curtain′s effective dust isolation performance.
air curtainoccupational healthdust isolationuniform distributionnumerical simulation
万方数据
维普
