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针对气体中心直流、液体涡流器离心式内缩进气液同轴喷嘴,采用高速摄影和PDPA测量了其流量和雾化特性。发现在常温常压下,喷嘴流量近似与喷注压降的0.477次方成正比。喷嘴喷雾场为空心锥形,雾化角约为110°,随液体压降增加,雾化锥角增大。液体压降不变,雾化锥角受中心气体卷吸作用随气体压降增加而减小。液膜破碎距离与雾化锥角有关,雾化锥角越大,液膜破碎距离越短,反之亦然。随径向距离增加,雾化液滴轴向速度、径向速度减小,SMD先增大然后略有减小,沿径向呈“马鞍”状双峰分布;随轴向距离增加,粒子轴向速度减小,SMD减小。
For the gas center DC, liquid swirler centrifugal retractable gas-liquid coaxial nozzle, the use of high-speed photography and PDPA measured the flow and atomization characteristics. Found at room temperature and pressure, the nozzle flow is approximately proportional to the 0.477 power injection pressure drop. Spray nozzle hollow cone-shaped, atomization angle of about 110 °, with the liquid pressure drop increases, atomization cone angle increases. The pressure drop of the liquid is constant, the atomization cone angle is reduced by the entrainment of the center gas as the gas pressure drop increases. Film breakup distance and atomization cone angle, the greater the atomization cone angle, the shorter the distance the liquid film broken, and vice versa. With the increase of radial distance, axial velocity and radial velocity of atomized droplets decrease, SMD increases first and then decreases slightly, and bimodal distribution is “saddle” in radial direction. With the increase of axial distance, Particle axial velocity decreases, SMD decreases.