光学技术, 2014, 40 (4): 376, 网络出版: 2014-06-30
射流抛光中的流场特性研究
Analysis of flow field characteristics in fluid jet polishing
摘要
为了给出射流抛光系统的优化设计参数, 从理论上分析了冲击射流流场的结构特点, 建立了工件壁面上的速度、压强与冲击角度、射流出口速度以及冲击距离的数学关系。就不同参数对射流流场分布的影响进行了定量计算, 结果表明, 工件壁面上的压强和速度与出口压强和速度成线性正比关系。当冲击距离大于9.6d(d为射流喷口的直径)时, 工件壁面压强和速度随冲击距离的增大而减小, 冲击距离增加到15d时, 壁面压强最大值减小到0.54p0(p0为射流出口处的压强)。工件壁面压强和速度随冲击角度的减小而减小, 当入射角为90°、60°和45°时, 分别得到壁面压强最大值ps=0.95 p0, 0.74p0, 0.475p0, 上游速度最大值um02=0.96u0, 0.8u0, 0.67u0(u0为射流出口处的速度)。
Abstract
By analyzing the flow field characteristics of impinging jet, mathematical relationship between the impact angle, stand-off distance, jet velocity and the pressure, velocity on wall is established. The influence of different parameters on fluid jet distribution is analyzed by quantitative calculate, the results indicate that the pressure and velocity on wall with the outlet pressure, velocity is linearly proportional. When the impact distance is greater than 9.6 times of the diameter of nozzle, the pressure and velocity on wall decrease with the increasing of stand-off distance. The peak pressure reduces to 0.54 times of the pressure of spout when the impact distance increases to 15 times of the diameter of nozzle. And they decrease with the decreasing of impact angle. When impact angles are 90°,60°,45°, ps=0.95p0, 0.74p0, 0.475p0, and um02=0.96u0, 0.8u0, 0.67u0 are got respectively.
罗银川, 李秀龙, 张杨, 张蓉竹, 杨李茗. 射流抛光中的流场特性研究[J]. 光学技术, 2014, 40(4): 376. LUO Yinchuan, LI Xiulong, ZHANG Yang, ZHANG Rongzhu, YANG Liming. Analysis of flow field characteristics in fluid jet polishing[J]. Optical Technique, 2014, 40(4): 376.