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旋流引入喷嘴不仅能够提高液体动能,也能提高雾化效果。为了理清切向旋流式雾化喷嘴的内外流场特性,通过数值计算研究了内流场的压力和速度分布,通过实验测试分析了不同参数(旋流通道直径、旋流室直径、射流水压)下的外流场分布。结果表明:旋流室上部中心区域会在旋流力与惯性作用下发生螺旋运动,产生明显压力梯度,导致负压形成。旋流明显地提高了喷嘴内部水流的速度,喷嘴轴线的速率也随口径增大而上升。随着射流水压的增加,雾滴D50表现出明显的减小趋势。雾滴D50随旋流室直径增大表现出先单调减小的变化,雾滴速度随旋流通道直径增大先增大后缓慢减小的变化,确定最佳旋流室直径3 cm,旋流通道直径为3 mm。
Swirling into the nozzle can not only improve the kinetic energy of liquid, but also improve the atomization effect. In order to clarify the internal and external flow field characteristics of the tangential atomizer nozzle, the pressure and velocity distributions of the internal flow field were studied numerically. The influence of different parameters (swirl channel diameter, swirl chamber diameter, jet flow Water pressure) under the flow field distribution. The results show that the central region in the upper part of the vortex chamber will spirally move under the influence of swirling force and inertia, resulting in obvious pressure gradient, resulting in the formation of negative pressure. Swirling significantly increases the rate of water flow inside the nozzle, and the rate at the nozzle axis also increases as the caliber increases. As the jet pressure increases, the droplet D50 shows a clear decreasing trend. The droplet D50 firstly monotonically decreases with the increase of the diameter of the swirl chamber. The velocity of the droplet increases first and then decreases with the increase of the diameter of the swirl channel, and the diameter of the optimal swirl chamber is 3 cm. The diameter of the track is 3 mm.