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- 2017
高环境压力下幂律流体射流液滴粒度特性试验
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Abstract:
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 fluid injection system and constant-volume chamber system，3D phase Doppler system was used to obtain the breakup droplets size distribution of a cylindrical power-law liquid jet in an enclosed space under various working conditions. The results indicate that under the same injection pressure，ambient pressure and nozzle structure parameters，Sauter mean diameter(SMD)of the breakup droplets decreases gradually along the jet axis. At the same axial position of the jet，SMD can be observed symmetric along the radial direction，and SMD gets much bigger on the edge of the jet. It is found from the experiments that SMD of the power-law liquid jet decreases with the increase of injection velocity and back pressure，and with the decrease of nozzle diameter. The results also indicate that the viscosities of power-law liquid jet have great effects on the breakup of the jets. It can be concluded that the experimental results agree fairly well with the results given by the instability analysis
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