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以带扩散塔的矿用对旋式轴流通风机为研究对象,应用计算流体力学软件FLUENT对通风机气动性能进行三维流场模拟,研究通风机内部三维流场的流动状况;结果表明:受扩散塔结构的影响,气流在进入扩散塔区域后其速度和方向发生了改变,导致气流在扩散塔出口处左侧区域的流动速度变得缓慢,而在扩散塔出口处右侧区域其气流的流动速度却变快。同时在靠近扩散塔左壁面区域出现了回流现象,从而造成了气流流速和压力在扩散塔出口处的分布极不均匀,加大了气流与右壁面的摩擦,进而降低通风机的气动性能。针对现有通风机扩散塔结构设计中存在的不足,文中提出了相应改进方案,该方案可以有效遏制扩散塔出口处回流的形成,改善通风机流道内气流的流动状况,同时提高矿用对旋式轴流通风机的气动性能。研究结果对矿用对旋式轴流通风机的优化设计具有一定的指导意义。
Taking the mining counter-rotating axial fan with diffusion tower as the research object, the three-dimensional flow field simulation of the aerodynamic performance of the fan was carried out by using the computational fluid dynamics software FLUENT. The flow field of the three-dimensional flow field in the fan was studied. Diffusion tower structure, the air flow into the diffusion tower area after its speed and direction has changed, resulting in air flow at the exit of the diffusion tower in the left area of the flow rate becomes slow, and in the diffusion tower at the right side of the area of its airflow Flow rate is faster. At the same time, the phenomenon of backflow appears near the left wall of diffuser. As a result, the distribution of air velocity and pressure at the outlet of diffuser is extremely uneven, which increases the friction between the airflow and the right wall, thus reducing the aerodynamic performance of the ventilator. Aiming at the shortcomings of existing fan diffuser structure design, a corresponding improvement scheme is proposed in this paper, which can effectively restrain the formation of backflow at the outlet of diffuser tower, improve the flow of air in the fan duct, Pneumatic performance of axial flow fan. The research results have some guiding significance for the optimization design of the counter-rotating axial-flow ventilator.