大气环境中双股自击式喷嘴雾化液滴的运动特性

Motion Properties of Spray Particles from Impinging Nozzle at Atmospheric Environment

为了研究大气环境中双股自击式喷嘴雾化液滴的运动特性,设计了双股自击式射流喷雾实验装置,运用多普勒相位粒子动态分析仪(PDPA),观测了喷嘴压降对于雾化液滴运动特性的影响,着重分析了液滴轴向速度和径向速度的分布。结果表明:随着测量截面与喷嘴间的距离由25mm增到100mm,液滴平均直径(D30)变大:当喷嘴压降为2.2MPa,D30由44.26 m增大到61.26 m,当喷嘴压降为2.6MPa,D30由42.88 m增大到55.49 m;距离喷嘴越远,液滴轴向速度和径向速度越小;测量点距离中心轴越远,液滴轴向速度越小,径向速度脉动越大;喷嘴压降增大,液滴平均直径减小,液滴轴向速度分布均匀性变好,径向速度分布均匀性变差。

An impinging nozzle was designed to investigate the motion properties of spray particles from impinging nozzle at atmospheric environment.Phase doppler particle analyzer（PDPA）was used to record the effects of the nozzle pressure on the motion properties of spray particles.The distributions of axial velocity and radial velocity for particles were analyzed emphatically.Results indicate that as the distance between the measurement section and the nozzle increases from 25 mm to 100 mm,the mean diameter（D30）of the particles at the pressure drop of 2.2MPa increases from 44.26 m to 61.26 m and from 42.88 m to 55.49 m at the pressure drop of 2.6 MPa.The further away from the nozzle,the smaller the axial velocity and the radial velocity of the particles.The axial velocity of the particles decreases and the radial velocity fluctuation increases with distance between the measuring points and the center axis increasing.The D30 of the particles decreases when the nozzle pressure increases,and the distribution uniformity of the particles is better for the axial velocity but worse for the radial velocity.