数控车床高压冷却喷嘴的优化设计
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摘要
为了研究高压冷却喷嘴结构参数对流体射流的影响,文章针对高压冷却系统的执行部件锥形喷嘴的收缩角、入口直径与出口直径的比值两个主要因素进行了结构参数的优化设计。采用计算流体动力学的分析软件Fluent对喷嘴的流场进行了数值模拟,通过仿真研究和分析对比其喷嘴流场的特性曲线获取了喷嘴的优化参数。基于Mixture多相流模型理论对其优化后的喷嘴进行了外部流场的气液两相模拟实验和车削断屑实验。研究结果表明:随着收缩角的增大,喷嘴射流的动压值先增大后减小,在α=25°时动压力达到了最大值;距喷嘴出口60 mm处截面上的径向速度随着距离的增加而下降,在α=25°时截面上的径向速度变化幅度最小;当喷嘴的直径比C_d=3时,射流初始段的轴向速度达到最大值,能产生更好的断屑效果。
In order to study the influence of structure parameters of high pressure cooling nozzle on the jet of fluid,In this paper,the optimization design of the contraction of conical nozzle angle 、the ratio of the contraction angle,the inlet diameter and the outlet diameter of the structure parameters of the high pressure cooling system is carried out. The flow field of the nozzle was numerically simulated by Fluent,The optimization parameters of the nozzle were obtained by simulating and analyzing the characteristics of the nozzle flow field. Based on Mixture multiphase flow model theory,the optimized nozzle was simulated by twophase gas-liquid two-phase flow. The results show that with the increase of the angle of contraction,the dynamic pressure value of nozzle jet first increases and then decreases,and the dynamic pressure reaches the maximum value at α = 25°;the radial velocity at the section of nozzle exit 60 mm When the diameter of the nozzle is smaller than C_d = 3,the axial velocity of the initial section of the jet reaches the maximum value,which can produce a better value of the radial velocity. Chip breaking effect.
In order to study the influence of structure parameters of high pressure cooling nozzle on the jet of fluid,In this paper,the optimization design of the contraction of conical nozzle angle 、the ratio of the contraction angle,the inlet diameter and the outlet diameter of the structure parameters of the high pressure cooling system is carried out. The flow field of the nozzle was numerically simulated by Fluent,The optimization parameters of the nozzle were obtained by simulating and analyzing the characteristics of the nozzle flow field. Based on Mixture multiphase flow model theory,the optimized nozzle was simulated by twophase gas-liquid two-phase flow. The results show that with the increase of the angle of contraction,the dynamic pressure value of nozzle jet first increases and then decreases,and the dynamic pressure reaches the maximum value at α = 25°;the radial velocity at the section of nozzle exit 60 mm When the diameter of the nozzle is smaller than C_d = 3,the axial velocity of the initial section of the jet reaches the maximum value,which can produce a better value of the radial velocity. Chip breaking effect.
引文
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[11]罗静,曾国辉,李丙乾.基于FLUENT的喷嘴孔型两相流场模拟分析[J].组合机床与自动化加工技术,2016(10):44-47.
[12]沈娟.高压水射流喷嘴的设计及其结构优化[D].苏州:苏州大学,2014.
[2]Katja Busch,Carsten Hochmuth,Bernhard Pause,et al.Investigation of Cooling and Lubrication Strategies for Machining High-Temperature Alloys[J].Procedia CIRP,2016,41:835-840.
[3]蒋鉴毅.数控深孔钻床高压冷却排屑液压系统的设计分析[J].机械制造,2008,46(9):8-10.
[4]周章根,马德毅.基于Fluent的高压喷嘴射流的数值模拟[J].机械制造与自动化,2010(1):61-62.
[5]王金东,吕志利,刘树林,等.基于FLUENT的气动喷砂两相流场分析[J].科学技术与工程,2009,9(17):5113-5115.
[6]Julien D,Stephane V,Arnaud E,et al.Numerical investigations in Rayleigh breakup of round liquid jets with VOF methods[J].Computers&Fluids,2011,50:10-23.
[7]陈敏恒,丛德滋,方图南,等.化工原理[M].北京:化学工业出版社,2006.
[8]张利平.液压传动与控制[M].西安:西北工业大学出版社,2005.
[9]周俊波,刘洋.FLUENT6.3流场分析从入门到精通[M].北京:机械工业出版社,2011.
[10]周文会.高压水射流喷嘴内外部流场的数值模拟研究[D].兰州:兰州理工大学,2008.
[11]罗静,曾国辉,李丙乾.基于FLUENT的喷嘴孔型两相流场模拟分析[J].组合机床与自动化加工技术,2016(10):44-47.
[12]沈娟.高压水射流喷嘴的设计及其结构优化[D].苏州:苏州大学,2014.