地面吹干机气膜气流特性研究

Research on Air Film Airflow Characteristics of Ground Dryer

以带有科恩达曲面的地面吹干机为研究对象,采用CFD技术数值模拟了诱导风速变化,以及侧板高出科恩达曲面距离的不同对地面吹干机气膜形成及气流特性的影响规律。模拟结果表明,随着诱导风速增大,流场内的速度等值面沿X轴正向发展得越远,覆盖范围越大。诱导风速20 m/s,25 m/s和30 m/s风量利用率接近,可根据需求采用不同诱导风速。随着侧板较科恩达曲面高出距离的增至8.4 mm,地面吹干机尾翼两侧卷吸现象逐渐减弱,气膜效果好,但当此段距离增至8.4 mm后,气膜效果随距离的增大无明显变化。

Taking the ground blower with Coanda surface as the research object, the CFD technique was used to numerically simulate the change of the induced wind speed, and the influence of the distance from the side plate to the Coanda surface on the air film formation and airflow characteristics of the surface blow dryer. The simulation results show that with the increase of induced wind speed, the farther the velocity isosurface in the flow field develops along the positive direction of the X-axis, the larger the coverage area;the induced wind speed is 20 m/s, 25 m/s and 30 m/s air volume utilization is close, different induced wind speeds can be used according to demand. With the increase of the distance between the side panel and the Coanda surface to 8.4 mm, the curling phenomenon on both sides of the surface of the surface dryer gradually weakened, and the film effect was good. However, when this distance increased to 8.4 mm,the film effect increased. There is no significant change in the increase in distance.