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基于自行搭建的射流系统和定容燃烧弹系统,采用三维相位多普勒技术,实现对幂律流体圆柱射流在封闭空间内不同工况下破碎液滴粒度场分布规律的测量.结果表明,对于同一种幂律流体,在相同的喷射压力、环境压力和喷嘴结构参数下,索特平均直径(SMD)随射流轴向位置的增大而减小;在同一轴向位置,SMD基本沿径向两侧呈对称分布,越远离中心SMD越大,射流速度越大,这种对称分布现象越明显;控制其他参数相同,SMD随着射流速度的增大而逐渐变小;随着环境压力的增大,SMD逐渐减小;喷嘴其他参数相同,SMD随着喷嘴直径的减小而逐渐减小;对于不同的幂律流体,黏度越大,SMD越大.试验结果与不稳定性理论分析所给出的幂律流体射流破碎规律是一致的.
Based on the self-built jet system and the fixed volume combustion system, the three-dimensional phase-Doppler technique was used to measure the particle size distribution law of the fragmented droplet of a power-law fluid cylindrical jet in a confined space under different operating conditions. The results show that for In the same kind of power-law fluid, with the same injection pressure, ambient pressure and nozzle structure parameters, the mean diameter (SMD) of SMD decreases with the increase of the axial position of the jet. At the same axial position, Symmetrical distribution on both sides, the greater the farther away from the center SMD, the greater the jet velocity, the more obvious this symmetrical distribution; the same control other parameters, SMD with jet velocity increases and gradually become smaller; as the ambient pressure increases Large, SMD gradually decreases; other parameters of nozzle are the same, SMD decreases with the decrease of nozzle diameter; for different power law fluid, the larger the viscosity is, the larger SMD is. Experimental results and theoretical analysis of instability The power law fluid jet broken law is consistent.